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2 /*-------------*
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3 * C prelude *
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4 *-------------*/
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5
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6 #include "postgres.h"
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7 #include "fmgr.h"
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8 #include "libpq/pqformat.h"
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9 #include "access/gist.h"
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10 #include "access/stratnum.h"
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11 #include "utils/array.h"
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12 #include <math.h>
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13
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14 #ifdef PG_MODULE_MAGIC
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15 PG_MODULE_MAGIC;
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16 #endif
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17
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18 #if INT_MAX < 2147483647
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19 #error Expected int type to be at least 32 bit wide
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20 #endif
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21
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22
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23 /*---------------------------------*
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24 * distance calculation on earth *
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25 * (using WGS-84 spheroid) *
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26 *---------------------------------*/
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27
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28 /* WGS-84 spheroid with following parameters:
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29 semi-major axis a = 6378137
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30 semi-minor axis b = a * (1 - 1/298.257223563)
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31 estimated diameter = 2 * (2*a+b)/3
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32 */
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33 #define PGL_SPHEROID_A 6378137.0 /* semi major axis */
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34 #define PGL_SPHEROID_F (1.0/298.257223563) /* flattening */
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35 #define PGL_SPHEROID_B (PGL_SPHEROID_A * (1.0-PGL_SPHEROID_F))
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36 #define PGL_EPS2 ( ( PGL_SPHEROID_A * PGL_SPHEROID_A - \
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37 PGL_SPHEROID_B * PGL_SPHEROID_B ) / \
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38 ( PGL_SPHEROID_A * PGL_SPHEROID_A ) )
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39 #define PGL_SUBEPS2 (1.0-PGL_EPS2)
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40 #define PGL_DIAMETER ((4.0*PGL_SPHEROID_A + 2.0*PGL_SPHEROID_B) / 3.0)
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41 #define PGL_SCALE (PGL_SPHEROID_A / PGL_DIAMETER) /* semi-major ref. */
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42 #define PGL_FADELIMIT (PGL_DIAMETER * M_PI / 6.0) /* 1/6 circumference */
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43 #define PGL_MAXDIST (PGL_DIAMETER * M_PI / 2.0) /* maximum distance */
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44
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45 /* calculate distance between two points on earth (given in degrees) */
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46 static inline double pgl_distance(
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47 double lat1, double lon1, double lat2, double lon2
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48 ) {
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49 float8 lat1cos, lat1sin, lat2cos, lat2sin, lon2cos, lon2sin;
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50 float8 nphi1, nphi2, x1, z1, x2, y2, z2, g, s, t;
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51 /* normalize delta longitude (lon2 > 0 && lon1 = 0) */
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52 /* lon1 = 0 (not used anymore) */
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53 lon2 = fabs(lon2-lon1);
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54 /* convert to radians (first divide, then multiply) */
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55 lat1 = (lat1 / 180.0) * M_PI;
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56 lat2 = (lat2 / 180.0) * M_PI;
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57 lon2 = (lon2 / 180.0) * M_PI;
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58 /* make lat2 >= lat1 to ensure reversal-symmetry despite floating point
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59 operations (lon2 >= lon1 is already ensured in a previous step) */
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60 if (lat2 < lat1) { float8 swap = lat1; lat1 = lat2; lat2 = swap; }
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61 /* calculate 3d coordinates on scaled ellipsoid which has an average diameter
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62 of 1.0 */
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63 lat1cos = cos(lat1); lat1sin = sin(lat1);
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64 lat2cos = cos(lat2); lat2sin = sin(lat2);
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65 lon2cos = cos(lon2); lon2sin = sin(lon2);
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66 nphi1 = PGL_SCALE / sqrt(1 - PGL_EPS2 * lat1sin * lat1sin);
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67 nphi2 = PGL_SCALE / sqrt(1 - PGL_EPS2 * lat2sin * lat2sin);
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68 x1 = nphi1 * lat1cos;
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69 z1 = nphi1 * PGL_SUBEPS2 * lat1sin;
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70 x2 = nphi2 * lat2cos * lon2cos;
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71 y2 = nphi2 * lat2cos * lon2sin;
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72 z2 = nphi2 * PGL_SUBEPS2 * lat2sin;
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73 /* calculate tunnel distance through scaled (diameter 1.0) ellipsoid */
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74 g = sqrt((x2-x1)*(x2-x1) + y2*y2 + (z2-z1)*(z2-z1));
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75 /* convert tunnel distance through scaled ellipsoid to approximated surface
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76 distance on original ellipsoid */
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77 if (g > 1.0) g = 1.0;
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78 s = PGL_DIAMETER * asin(g);
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79 /* return result only if small enough to be precise (less than 1/3 of
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80 maximum possible distance) */
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81 if (s <= PGL_FADELIMIT) return s;
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82 /* calculate tunnel distance to antipodal point through scaled ellipsoid */
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83 g = sqrt((x2+x1)*(x2+x1) + y2*y2 + (z2+z1)*(z2+z1));
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84 /* convert tunnel distance to antipodal point through scaled ellipsoid to
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85 approximated surface distance to antipodal point on original ellipsoid */
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86 if (g > 1.0) g = 1.0;
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87 t = PGL_DIAMETER * asin(g);
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88 /* surface distance between original points can now be approximated by
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89 substracting antipodal distance from maximum possible distance;
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90 return result only if small enough (less than 1/3 of maximum possible
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91 distance) */
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92 if (t <= PGL_FADELIMIT) return PGL_MAXDIST-t;
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93 /* otherwise crossfade direct and antipodal result to ensure monotonicity */
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94 return (
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95 (s * (t-PGL_FADELIMIT) + (PGL_MAXDIST-t) * (s-PGL_FADELIMIT)) /
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96 (s + t - 2*PGL_FADELIMIT)
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97 );
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98 }
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99
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100 /* finite distance that can not be reached on earth */
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101 #define PGL_ULTRA_DISTANCE (3 * PGL_MAXDIST)
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102
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103
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104 /*--------------------------------*
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105 * simple geographic data types *
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106 *--------------------------------*/
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107
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108 /* point on earth given by latitude and longitude in degrees */
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109 /* (type "epoint" in SQL) */
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110 typedef struct {
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111 double lat; /* between -90 and 90 (both inclusive) */
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112 double lon; /* between -180 and 180 (both inclusive) */
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113 } pgl_point;
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114
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115 /* box delimited by two parallels and two meridians (all in degrees) */
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116 /* (type "ebox" in SQL) */
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117 typedef struct {
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118 double lat_min; /* between -90 and 90 (both inclusive) */
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119 double lat_max; /* between -90 and 90 (both inclusive) */
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120 double lon_min; /* between -180 and 180 (both inclusive) */
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121 double lon_max; /* between -180 and 180 (both inclusive) */
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122 /* if lat_min > lat_max, then box is empty */
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123 /* if lon_min > lon_max, then 180th meridian is crossed */
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124 } pgl_box;
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125
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126 /* circle on earth surface (for radial searches with fixed radius) */
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127 /* (type "ecircle" in SQL) */
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128 typedef struct {
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129 pgl_point center;
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130 double radius; /* positive (including +0 but excluding -0), or -INFINITY */
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131 /* A negative radius (i.e. -INFINITY) denotes nothing (i.e. no point),
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132 zero radius (0) denotes a single point,
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133 a finite radius (0 < radius < INFINITY) denotes a filled circle, and
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134 a radius of INFINITY is valid and means complete coverage of earth. */
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135 } pgl_circle;
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136
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137
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138 /*----------------------------------*
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139 * geographic "cluster" data type *
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140 *----------------------------------*/
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141
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142 /* A cluster is a collection of points, paths, outlines, and polygons. If two
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143 polygons in a cluster overlap, the area covered by both polygons does not
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144 belong to the cluster. This way, a cluster can be used to describe complex
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145 shapes like polygons with holes. Outlines are non-filled polygons. Paths are
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146 open by default (i.e. the last point in the list is not connected with the
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147 first point in the list). Note that each outline or polygon in a cluster
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148 must cover a longitude range of less than 180 degrees to avoid ambiguities.
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149 Areas which are larger may be split into multiple polygons. */
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150
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151 /* maximum number of points in a cluster */
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152 /* (limited to avoid integer overflows, e.g. when allocating memory) */
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153 #define PGL_CLUSTER_MAXPOINTS 16777216
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154
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155 /* types of cluster entries */
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156 #define PGL_ENTRY_POINT 1 /* a point */
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157 #define PGL_ENTRY_PATH 2 /* a path from first point to last point */
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158 #define PGL_ENTRY_OUTLINE 3 /* a non-filled polygon with given vertices */
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159 #define PGL_ENTRY_POLYGON 4 /* a filled polygon with given vertices */
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160
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161 /* Entries of a cluster are described by two different structs: pgl_newentry
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162 and pgl_entry. The first is used only during construction of a cluster, the
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163 second is used in all other cases (e.g. when reading clusters from the
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164 database, performing operations, etc). */
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165
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166 /* entry for new geographic cluster during construction of that cluster */
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167 typedef struct {
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168 int32_t entrytype;
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169 int32_t npoints;
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170 pgl_point *points; /* pointer to an array of points (pgl_point) */
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171 } pgl_newentry;
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172
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173 /* entry of geographic cluster */
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174 typedef struct {
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175 int32_t entrytype; /* type of entry: point, path, outline, polygon */
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176 int32_t npoints; /* number of stored points (set to 1 for point entry) */
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177 int32_t offset; /* offset of pgl_point array from cluster base address */
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178 /* use macro PGL_ENTRY_POINTS to obtain a pointer to the array of points */
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179 } pgl_entry;
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180
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181 /* geographic cluster which is a collection of points, (open) paths, polygons,
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182 and outlines (non-filled polygons) */
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183 typedef struct {
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184 char header[VARHDRSZ]; /* PostgreSQL header for variable size data types */
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185 int32_t nentries; /* number of stored points */
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186 pgl_circle bounding; /* bounding circle */
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187 /* Note: bounding circle ensures alignment of pgl_cluster for points */
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188 pgl_entry entries[FLEXIBLE_ARRAY_MEMBER]; /* var-length data */
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189 } pgl_cluster;
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190
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191 /* macro to determine memory alignment of points */
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192 /* (needed to store pgl_point array after entries in pgl_cluster) */
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193 typedef struct { char dummy; pgl_point aligned; } pgl_point_alignment;
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194 #define PGL_POINT_ALIGNMENT offsetof(pgl_point_alignment, aligned)
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195
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196 /* macro to extract a pointer to the array of points of a cluster entry */
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197 #define PGL_ENTRY_POINTS(cluster, idx) \
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198 ((pgl_point *)(((intptr_t)cluster)+(cluster)->entries[idx].offset))
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199
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200 /* convert pgl_newentry array to pgl_cluster */
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201 static pgl_cluster *pgl_new_cluster(int nentries, pgl_newentry *entries) {
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202 int i; /* index of current entry */
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203 int npoints = 0; /* number of points in whole cluster */
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204 int entry_npoints; /* number of points in current entry */
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205 int points_offset = PGL_POINT_ALIGNMENT * (
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206 ( offsetof(pgl_cluster, entries) +
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207 nentries * sizeof(pgl_entry) +
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208 PGL_POINT_ALIGNMENT - 1
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209 ) / PGL_POINT_ALIGNMENT
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210 ); /* offset of pgl_point array from base address (considering alignment) */
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211 pgl_cluster *cluster; /* new cluster to be returned */
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212 /* determine total number of points */
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213 for (i=0; i<nentries; i++) npoints += entries[i].npoints;
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214 /* allocate memory for cluster (including entries and points) */
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215 cluster = palloc(points_offset + npoints * sizeof(pgl_point));
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216 /* re-count total number of points to determine offset for each entry */
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217 npoints = 0;
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218 /* copy entries and points */
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219 for (i=0; i<nentries; i++) {
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220 /* determine number of points in entry */
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221 entry_npoints = entries[i].npoints;
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222 /* copy entry */
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223 cluster->entries[i].entrytype = entries[i].entrytype;
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224 cluster->entries[i].npoints = entry_npoints;
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225 /* calculate offset (in bytes) of pgl_point array */
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226 cluster->entries[i].offset = points_offset + npoints * sizeof(pgl_point);
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227 /* copy points */
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228 memcpy(
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229 PGL_ENTRY_POINTS(cluster, i),
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230 entries[i].points,
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231 entry_npoints * sizeof(pgl_point)
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232 );
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233 /* update total number of points processed */
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234 npoints += entry_npoints;
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235 }
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236 /* set number of entries in cluster */
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237 cluster->nentries = nentries;
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238 /* set PostgreSQL header for variable sized data */
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239 SET_VARSIZE(cluster, points_offset + npoints * sizeof(pgl_point));
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240 /* return newly created cluster */
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241 return cluster;
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242 }
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243
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244
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245 /*----------------------------------------*
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246 * C functions on geographic data types *
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247 *----------------------------------------*/
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248
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249 /* round latitude or longitude to 12 digits after decimal point */
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250 static inline double pgl_round(double val) {
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251 return round(val * 1e12) / 1e12;
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252 }
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253
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254 /* compare two points */
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255 /* (equality when same point on earth is described, otherwise an arbitrary
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256 linear order) */
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257 static int pgl_point_cmp(pgl_point *point1, pgl_point *point2) {
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258 double lon1, lon2; /* modified longitudes for special cases */
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259 /* use latitude as first ordering criterion */
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260 if (point1->lat < point2->lat) return -1;
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261 if (point1->lat > point2->lat) return 1;
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262 /* determine modified longitudes (considering special case of poles and
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263 180th meridian which can be described as W180 or E180) */
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264 if (point1->lat == -90 || point1->lat == 90) lon1 = 0;
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265 else if (point1->lon == 180) lon1 = -180;
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266 else lon1 = point1->lon;
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267 if (point2->lat == -90 || point2->lat == 90) lon2 = 0;
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268 else if (point2->lon == 180) lon2 = -180;
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269 else lon2 = point2->lon;
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270 /* use (modified) longitude as secondary ordering criterion */
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271 if (lon1 < lon2) return -1;
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272 if (lon1 > lon2) return 1;
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273 /* no difference found, points are equal */
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274 return 0;
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|
jbe@0
|
275 }
|
|
jbe@0
|
276
|
|
jbe@0
|
277 /* compare two boxes */
|
|
jbe@0
|
278 /* (equality when same box on earth is described, otherwise an arbitrary linear
|
|
jbe@0
|
279 order) */
|
|
jbe@0
|
280 static int pgl_box_cmp(pgl_box *box1, pgl_box *box2) {
|
|
jbe@0
|
281 /* two empty boxes are equal, and an empty box is always considered "less
|
|
jbe@0
|
282 than" a non-empty box */
|
|
jbe@0
|
283 if (box1->lat_min> box1->lat_max && box2->lat_min<=box2->lat_max) return -1;
|
|
jbe@0
|
284 if (box1->lat_min> box1->lat_max && box2->lat_min> box2->lat_max) return 0;
|
|
jbe@0
|
285 if (box1->lat_min<=box1->lat_max && box2->lat_min> box2->lat_max) return 1;
|
|
jbe@0
|
286 /* use southern border as first ordering criterion */
|
|
jbe@0
|
287 if (box1->lat_min < box2->lat_min) return -1;
|
|
jbe@0
|
288 if (box1->lat_min > box2->lat_min) return 1;
|
|
jbe@0
|
289 /* use northern border as second ordering criterion */
|
|
jbe@0
|
290 if (box1->lat_max < box2->lat_max) return -1;
|
|
jbe@0
|
291 if (box1->lat_max > box2->lat_max) return 1;
|
|
jbe@0
|
292 /* use western border as third ordering criterion */
|
|
jbe@0
|
293 if (box1->lon_min < box2->lon_min) return -1;
|
|
jbe@0
|
294 if (box1->lon_min > box2->lon_min) return 1;
|
|
jbe@0
|
295 /* use eastern border as fourth ordering criterion */
|
|
jbe@0
|
296 if (box1->lon_max < box2->lon_max) return -1;
|
|
jbe@0
|
297 if (box1->lon_max > box2->lon_max) return 1;
|
|
jbe@0
|
298 /* no difference found, boxes are equal */
|
|
jbe@0
|
299 return 0;
|
|
jbe@0
|
300 }
|
|
jbe@0
|
301
|
|
jbe@0
|
302 /* compare two circles */
|
|
jbe@0
|
303 /* (equality when same circle on earth is described, otherwise an arbitrary
|
|
jbe@0
|
304 linear order) */
|
|
jbe@0
|
305 static int pgl_circle_cmp(pgl_circle *circle1, pgl_circle *circle2) {
|
|
jbe@0
|
306 /* two circles with same infinite radius (positive or negative infinity) are
|
|
jbe@0
|
307 considered equal independently of center point */
|
|
jbe@0
|
308 if (
|
|
jbe@0
|
309 !isfinite(circle1->radius) && !isfinite(circle2->radius) &&
|
|
jbe@0
|
310 circle1->radius == circle2->radius
|
|
jbe@0
|
311 ) return 0;
|
|
jbe@0
|
312 /* use radius as first ordering criterion */
|
|
jbe@0
|
313 if (circle1->radius < circle2->radius) return -1;
|
|
jbe@0
|
314 if (circle1->radius > circle2->radius) return 1;
|
|
jbe@0
|
315 /* use center point as secondary ordering criterion */
|
|
jbe@0
|
316 return pgl_point_cmp(&(circle1->center), &(circle2->center));
|
|
jbe@0
|
317 }
|
|
jbe@0
|
318
|
|
jbe@0
|
319 /* set box to empty box*/
|
|
jbe@0
|
320 static void pgl_box_set_empty(pgl_box *box) {
|
|
jbe@0
|
321 box->lat_min = INFINITY;
|
|
jbe@0
|
322 box->lat_max = -INFINITY;
|
|
jbe@0
|
323 box->lon_min = 0;
|
|
jbe@0
|
324 box->lon_max = 0;
|
|
jbe@0
|
325 }
|
|
jbe@0
|
326
|
|
jbe@0
|
327 /* check if point is inside a box */
|
|
jbe@0
|
328 static bool pgl_point_in_box(pgl_point *point, pgl_box *box) {
|
|
jbe@0
|
329 return (
|
|
jbe@0
|
330 point->lat >= box->lat_min && point->lat <= box->lat_max && (
|
|
jbe@0
|
331 (box->lon_min > box->lon_max) ? (
|
|
jbe@0
|
332 /* box crosses 180th meridian */
|
|
jbe@0
|
333 point->lon >= box->lon_min || point->lon <= box->lon_max
|
|
jbe@0
|
334 ) : (
|
|
jbe@0
|
335 /* box does not cross the 180th meridian */
|
|
jbe@0
|
336 point->lon >= box->lon_min && point->lon <= box->lon_max
|
|
jbe@0
|
337 )
|
|
jbe@0
|
338 )
|
|
jbe@0
|
339 );
|
|
jbe@0
|
340 }
|
|
jbe@0
|
341
|
|
jbe@0
|
342 /* check if two boxes overlap */
|
|
jbe@0
|
343 static bool pgl_boxes_overlap(pgl_box *box1, pgl_box *box2) {
|
|
jbe@0
|
344 return (
|
|
jbe@0
|
345 box2->lat_max >= box2->lat_min && /* ensure box2 is not empty */
|
|
jbe@0
|
346 ( box2->lat_min >= box1->lat_min || box2->lat_max >= box1->lat_min ) &&
|
|
jbe@0
|
347 ( box2->lat_min <= box1->lat_max || box2->lat_max <= box1->lat_max ) && (
|
|
jbe@0
|
348 (
|
|
jbe@0
|
349 /* check if one and only one box crosses the 180th meridian */
|
|
jbe@0
|
350 ((box1->lon_min > box1->lon_max) ? 1 : 0) ^
|
|
jbe@0
|
351 ((box2->lon_min > box2->lon_max) ? 1 : 0)
|
|
jbe@0
|
352 ) ? (
|
|
jbe@0
|
353 /* exactly one box crosses the 180th meridian */
|
|
jbe@0
|
354 box2->lon_min >= box1->lon_min || box2->lon_max >= box1->lon_min ||
|
|
jbe@0
|
355 box2->lon_min <= box1->lon_max || box2->lon_max <= box1->lon_max
|
|
jbe@0
|
356 ) : (
|
|
jbe@0
|
357 /* no box or both boxes cross the 180th meridian */
|
|
jbe@0
|
358 (
|
|
jbe@0
|
359 (box2->lon_min >= box1->lon_min || box2->lon_max >= box1->lon_min) &&
|
|
jbe@0
|
360 (box2->lon_min <= box1->lon_max || box2->lon_max <= box1->lon_max)
|
|
jbe@0
|
361 ) ||
|
|
jbe@0
|
362 /* handle W180 == E180 */
|
|
jbe@0
|
363 ( box1->lon_min == -180 && box2->lon_max == 180 ) ||
|
|
jbe@0
|
364 ( box2->lon_min == -180 && box1->lon_max == 180 )
|
|
jbe@0
|
365 )
|
|
jbe@0
|
366 )
|
|
jbe@0
|
367 );
|
|
jbe@0
|
368 }
|
|
jbe@0
|
369
|
|
jbe@0
|
370 /* check unambiguousness of east/west orientation of cluster entries and set
|
|
jbe@0
|
371 bounding circle of cluster */
|
|
jbe@0
|
372 static bool pgl_finalize_cluster(pgl_cluster *cluster) {
|
|
jbe@0
|
373 int i, j; /* i: index of entry, j: index of point in entry */
|
|
jbe@0
|
374 int npoints; /* number of points in entry */
|
|
jbe@0
|
375 int total_npoints = 0; /* total number of points in cluster */
|
|
jbe@0
|
376 pgl_point *points; /* points in entry */
|
|
jbe@0
|
377 int lon_dir; /* first point of entry west (-1) or east (+1) */
|
|
jbe@0
|
378 double lon_break = 0; /* antipodal longitude of first point in entry */
|
|
jbe@0
|
379 double lon_min, lon_max; /* covered longitude range of entry */
|
|
jbe@0
|
380 double value; /* temporary variable */
|
|
jbe@0
|
381 /* reset bounding circle center to empty circle at 0/0 coordinates */
|
|
jbe@0
|
382 cluster->bounding.center.lat = 0;
|
|
jbe@0
|
383 cluster->bounding.center.lon = 0;
|
|
jbe@0
|
384 cluster->bounding.radius = -INFINITY;
|
|
jbe@0
|
385 /* if cluster is not empty */
|
|
jbe@0
|
386 if (cluster->nentries != 0) {
|
|
jbe@0
|
387 /* iterate over all cluster entries and ensure they each cover a longitude
|
|
jbe@0
|
388 range less than 180 degrees */
|
|
jbe@0
|
389 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
390 /* get properties of entry */
|
|
jbe@0
|
391 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
392 points = PGL_ENTRY_POINTS(cluster, i);
|
|
jbe@0
|
393 /* get longitude of first point of entry */
|
|
jbe@0
|
394 value = points[0].lon;
|
|
jbe@0
|
395 /* initialize lon_min and lon_max with longitude of first point */
|
|
jbe@0
|
396 lon_min = value;
|
|
jbe@0
|
397 lon_max = value;
|
|
jbe@0
|
398 /* determine east/west orientation of first point and calculate antipodal
|
|
jbe@0
|
399 longitude (Note: rounding required here) */
|
|
jbe@0
|
400 if (value < 0) { lon_dir = -1; lon_break = pgl_round(value + 180); }
|
|
jbe@0
|
401 else if (value > 0) { lon_dir = 1; lon_break = pgl_round(value - 180); }
|
|
jbe@0
|
402 else lon_dir = 0;
|
|
jbe@0
|
403 /* iterate over all other points in entry */
|
|
jbe@0
|
404 for (j=1; j<npoints; j++) {
|
|
jbe@0
|
405 /* consider longitude wrap-around */
|
|
jbe@0
|
406 value = points[j].lon;
|
|
jbe@0
|
407 if (lon_dir<0 && value>lon_break) value = pgl_round(value - 360);
|
|
jbe@0
|
408 else if (lon_dir>0 && value<lon_break) value = pgl_round(value + 360);
|
|
jbe@0
|
409 /* update lon_min and lon_max */
|
|
jbe@0
|
410 if (value < lon_min) lon_min = value;
|
|
jbe@0
|
411 else if (value > lon_max) lon_max = value;
|
|
jbe@0
|
412 /* return false if 180 degrees or more are covered */
|
|
jbe@0
|
413 if (lon_max - lon_min >= 180) return false;
|
|
jbe@0
|
414 }
|
|
jbe@0
|
415 }
|
|
jbe@0
|
416 /* iterate over all points of all entries and calculate arbitrary center
|
|
jbe@0
|
417 point for bounding circle (best if center point minimizes the radius,
|
|
jbe@0
|
418 but some error is allowed here) */
|
|
jbe@0
|
419 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
420 /* get properties of entry */
|
|
jbe@0
|
421 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
422 points = PGL_ENTRY_POINTS(cluster, i);
|
|
jbe@0
|
423 /* check if first entry */
|
|
jbe@0
|
424 if (i==0) {
|
|
jbe@0
|
425 /* get longitude of first point of first entry in whole cluster */
|
|
jbe@0
|
426 value = points[0].lon;
|
|
jbe@0
|
427 /* initialize lon_min and lon_max with longitude of first point of
|
|
jbe@0
|
428 first entry in whole cluster (used to determine if whole cluster
|
|
jbe@0
|
429 covers a longitude range of 180 degrees or more) */
|
|
jbe@0
|
430 lon_min = value;
|
|
jbe@0
|
431 lon_max = value;
|
|
jbe@0
|
432 /* determine east/west orientation of first point and calculate
|
|
jbe@0
|
433 antipodal longitude (Note: rounding not necessary here) */
|
|
jbe@0
|
434 if (value < 0) { lon_dir = -1; lon_break = value + 180; }
|
|
jbe@0
|
435 else if (value > 0) { lon_dir = 1; lon_break = value - 180; }
|
|
jbe@0
|
436 else lon_dir = 0;
|
|
jbe@0
|
437 }
|
|
jbe@0
|
438 /* iterate over all points in entry */
|
|
jbe@0
|
439 for (j=0; j<npoints; j++) {
|
|
jbe@0
|
440 /* longitude wrap-around (Note: rounding not necessary here) */
|
|
jbe@0
|
441 value = points[j].lon;
|
|
jbe@0
|
442 if (lon_dir < 0 && value > lon_break) value -= 360;
|
|
jbe@0
|
443 else if (lon_dir > 0 && value < lon_break) value += 360;
|
|
jbe@0
|
444 if (value < lon_min) lon_min = value;
|
|
jbe@0
|
445 else if (value > lon_max) lon_max = value;
|
|
jbe@0
|
446 /* set bounding circle to cover whole earth if more than 180 degrees
|
|
jbe@0
|
447 are covered */
|
|
jbe@0
|
448 if (lon_max - lon_min >= 180) {
|
|
jbe@0
|
449 cluster->bounding.center.lat = 0;
|
|
jbe@0
|
450 cluster->bounding.center.lon = 0;
|
|
jbe@0
|
451 cluster->bounding.radius = INFINITY;
|
|
jbe@0
|
452 return true;
|
|
jbe@0
|
453 }
|
|
jbe@0
|
454 /* add point to bounding circle center (for average calculation) */
|
|
jbe@0
|
455 cluster->bounding.center.lat += points[j].lat;
|
|
jbe@0
|
456 cluster->bounding.center.lon += value;
|
|
jbe@0
|
457 }
|
|
jbe@0
|
458 /* count total number of points */
|
|
jbe@0
|
459 total_npoints += npoints;
|
|
jbe@0
|
460 }
|
|
jbe@0
|
461 /* determine average latitude and longitude of cluster */
|
|
jbe@0
|
462 cluster->bounding.center.lat /= total_npoints;
|
|
jbe@0
|
463 cluster->bounding.center.lon /= total_npoints;
|
|
jbe@0
|
464 /* normalize longitude of center of cluster bounding circle */
|
|
jbe@0
|
465 if (cluster->bounding.center.lon < -180) {
|
|
jbe@0
|
466 cluster->bounding.center.lon += 360;
|
|
jbe@0
|
467 }
|
|
jbe@0
|
468 else if (cluster->bounding.center.lon > 180) {
|
|
jbe@0
|
469 cluster->bounding.center.lon -= 360;
|
|
jbe@0
|
470 }
|
|
jbe@0
|
471 /* round bounding circle center (useful if it is used by other functions) */
|
|
jbe@0
|
472 cluster->bounding.center.lat = pgl_round(cluster->bounding.center.lat);
|
|
jbe@0
|
473 cluster->bounding.center.lon = pgl_round(cluster->bounding.center.lon);
|
|
jbe@0
|
474 /* calculate radius of bounding circle */
|
|
jbe@0
|
475 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
476 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
477 points = PGL_ENTRY_POINTS(cluster, i);
|
|
jbe@0
|
478 for (j=0; j<npoints; j++) {
|
|
jbe@0
|
479 value = pgl_distance(
|
|
jbe@0
|
480 cluster->bounding.center.lat, cluster->bounding.center.lon,
|
|
jbe@0
|
481 points[j].lat, points[j].lon
|
|
jbe@0
|
482 );
|
|
jbe@0
|
483 if (value > cluster->bounding.radius) cluster->bounding.radius = value;
|
|
jbe@0
|
484 }
|
|
jbe@0
|
485 }
|
|
jbe@0
|
486 }
|
|
jbe@0
|
487 /* return true (east/west orientation is unambiguous) */
|
|
jbe@0
|
488 return true;
|
|
jbe@0
|
489 }
|
|
jbe@0
|
490
|
|
jbe@0
|
491 /* check if point is inside cluster */
|
|
jbe@0
|
492 static bool pgl_point_in_cluster(pgl_point *point, pgl_cluster *cluster) {
|
|
jbe@0
|
493 int i, j, k; /* i: entry, j: point in entry, k: next point in entry */
|
|
jbe@0
|
494 int entrytype; /* type of entry */
|
|
jbe@0
|
495 int npoints; /* number of points in entry */
|
|
jbe@0
|
496 pgl_point *points; /* array of points in entry */
|
|
jbe@0
|
497 int lon_dir = 0; /* first vertex west (-1) or east (+1) */
|
|
jbe@0
|
498 double lon_break = 0; /* antipodal longitude of first vertex */
|
|
jbe@0
|
499 double lat0 = point->lat; /* latitude of point */
|
|
jbe@0
|
500 double lon0; /* (adjusted) longitude of point */
|
|
jbe@0
|
501 double lat1, lon1; /* latitude and (adjusted) longitude of vertex */
|
|
jbe@0
|
502 double lat2, lon2; /* latitude and (adjusted) longitude of next vertex */
|
|
jbe@0
|
503 double lon; /* longitude of intersection */
|
|
jbe@0
|
504 int counter = 0; /* counter for intersections east of point */
|
|
jbe@0
|
505 /* iterate over all entries */
|
|
jbe@0
|
506 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
507 /* get properties of entry */
|
|
jbe@0
|
508 entrytype = cluster->entries[i].entrytype;
|
|
jbe@0
|
509 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
510 points = PGL_ENTRY_POINTS(cluster, i);
|
|
jbe@0
|
511 /* determine east/west orientation of first point of entry and calculate
|
|
jbe@0
|
512 antipodal longitude */
|
|
jbe@0
|
513 lon_break = points[0].lon;
|
|
jbe@0
|
514 if (lon_break < 0) { lon_dir = -1; lon_break += 180; }
|
|
jbe@0
|
515 else if (lon_break > 0) { lon_dir = 1; lon_break -= 180; }
|
|
jbe@0
|
516 else lon_dir = 0;
|
|
jbe@0
|
517 /* get longitude of point */
|
|
jbe@0
|
518 lon0 = point->lon;
|
|
jbe@0
|
519 /* consider longitude wrap-around for point */
|
|
jbe@0
|
520 if (lon_dir < 0 && lon0 > lon_break) lon0 = pgl_round(lon0 - 360);
|
|
jbe@0
|
521 else if (lon_dir > 0 && lon0 < lon_break) lon0 = pgl_round(lon0 + 360);
|
|
jbe@0
|
522 /* iterate over all edges and vertices */
|
|
jbe@0
|
523 for (j=0; j<npoints; j++) {
|
|
jbe@0
|
524 /* return true if point is on vertex of polygon */
|
|
jbe@0
|
525 if (pgl_point_cmp(point, &(points[j])) == 0) return true;
|
|
jbe@0
|
526 /* calculate index of next vertex */
|
|
jbe@0
|
527 k = (j+1) % npoints;
|
|
jbe@0
|
528 /* skip last edge unless entry is (closed) outline or polygon */
|
|
jbe@0
|
529 if (
|
|
jbe@0
|
530 k == 0 &&
|
|
jbe@0
|
531 entrytype != PGL_ENTRY_OUTLINE &&
|
|
jbe@0
|
532 entrytype != PGL_ENTRY_POLYGON
|
|
jbe@0
|
533 ) continue;
|
|
jbe@16
|
534 /* use previously calculated values for lat1 and lon1 if possible */
|
|
jbe@16
|
535 if (j) {
|
|
jbe@16
|
536 lat1 = lat2;
|
|
jbe@16
|
537 lon1 = lon2;
|
|
jbe@16
|
538 } else {
|
|
jbe@16
|
539 /* otherwise get latitude and longitude values of first vertex */
|
|
jbe@16
|
540 lat1 = points[0].lat;
|
|
jbe@16
|
541 lon1 = points[0].lon;
|
|
jbe@16
|
542 /* and consider longitude wrap-around for first vertex */
|
|
jbe@16
|
543 if (lon_dir < 0 && lon1 > lon_break) lon1 = pgl_round(lon1 - 360);
|
|
jbe@16
|
544 else if (lon_dir > 0 && lon1 < lon_break) lon1 = pgl_round(lon1 + 360);
|
|
jbe@16
|
545 }
|
|
jbe@16
|
546 /* get latitude and longitude of next vertex */
|
|
jbe@0
|
547 lat2 = points[k].lat;
|
|
jbe@0
|
548 lon2 = points[k].lon;
|
|
jbe@16
|
549 /* consider longitude wrap-around for next vertex */
|
|
jbe@0
|
550 if (lon_dir < 0 && lon2 > lon_break) lon2 = pgl_round(lon2 - 360);
|
|
jbe@0
|
551 else if (lon_dir > 0 && lon2 < lon_break) lon2 = pgl_round(lon2 + 360);
|
|
jbe@0
|
552 /* return true if point is on horizontal (west to east) edge of polygon */
|
|
jbe@0
|
553 if (
|
|
jbe@0
|
554 lat0 == lat1 && lat0 == lat2 &&
|
|
jbe@0
|
555 ( (lon0 >= lon1 && lon0 <= lon2) || (lon0 >= lon2 && lon0 <= lon1) )
|
|
jbe@0
|
556 ) return true;
|
|
jbe@0
|
557 /* check if edge crosses east/west line of point */
|
|
jbe@0
|
558 if ((lat1 < lat0 && lat2 >= lat0) || (lat2 < lat0 && lat1 >= lat0)) {
|
|
jbe@0
|
559 /* calculate longitude of intersection */
|
|
jbe@0
|
560 lon = (lon1 * (lat2-lat0) + lon2 * (lat0-lat1)) / (lat2-lat1);
|
|
jbe@0
|
561 /* return true if intersection goes (approximately) through point */
|
|
jbe@0
|
562 if (pgl_round(lon) == lon0) return true;
|
|
jbe@0
|
563 /* count intersection if east of point and entry is polygon*/
|
|
jbe@0
|
564 if (entrytype == PGL_ENTRY_POLYGON && lon > lon0) counter++;
|
|
jbe@0
|
565 }
|
|
jbe@0
|
566 }
|
|
jbe@0
|
567 }
|
|
jbe@0
|
568 /* return true if number of intersections is odd */
|
|
jbe@0
|
569 return counter & 1;
|
|
jbe@0
|
570 }
|
|
jbe@0
|
571
|
|
jbe@16
|
572 /* check if all points of the second cluster are inside the first cluster */
|
|
jbe@16
|
573 static inline bool pgl_all_cluster_points_in_cluster(
|
|
jbe@16
|
574 pgl_cluster *outer, pgl_cluster *inner
|
|
jbe@16
|
575 ) {
|
|
jbe@16
|
576 int i, j; /* i: entry, j: point in entry */
|
|
jbe@16
|
577 int npoints; /* number of points in entry */
|
|
jbe@16
|
578 pgl_point *points; /* array of points in entry */
|
|
jbe@16
|
579 /* iterate over all entries of "inner" cluster */
|
|
jbe@16
|
580 for (i=0; i<inner->nentries; i++) {
|
|
jbe@16
|
581 /* get properties of entry */
|
|
jbe@16
|
582 npoints = inner->entries[i].npoints;
|
|
jbe@16
|
583 points = PGL_ENTRY_POINTS(inner, i);
|
|
jbe@16
|
584 /* iterate over all points in entry of "inner" cluster */
|
|
jbe@16
|
585 for (j=0; j<npoints; j++) {
|
|
jbe@16
|
586 /* return false if one point of inner cluster is not in outer cluster */
|
|
jbe@16
|
587 if (!pgl_point_in_cluster(points+j, outer)) return false;
|
|
jbe@16
|
588 }
|
|
jbe@16
|
589 }
|
|
jbe@16
|
590 /* otherwise return true */
|
|
jbe@16
|
591 return true;
|
|
jbe@16
|
592 }
|
|
jbe@16
|
593
|
|
jbe@16
|
594 /* check if any point the second cluster is inside the first cluster */
|
|
jbe@16
|
595 static inline bool pgl_any_cluster_points_in_cluster(
|
|
jbe@16
|
596 pgl_cluster *outer, pgl_cluster *inner
|
|
jbe@16
|
597 ) {
|
|
jbe@16
|
598 int i, j; /* i: entry, j: point in entry */
|
|
jbe@16
|
599 int npoints; /* number of points in entry */
|
|
jbe@16
|
600 pgl_point *points; /* array of points in entry */
|
|
jbe@16
|
601 /* iterate over all entries of "inner" cluster */
|
|
jbe@16
|
602 for (i=0; i<inner->nentries; i++) {
|
|
jbe@16
|
603 /* get properties of entry */
|
|
jbe@16
|
604 npoints = inner->entries[i].npoints;
|
|
jbe@16
|
605 points = PGL_ENTRY_POINTS(inner, i);
|
|
jbe@16
|
606 /* iterate over all points in entry of "inner" cluster */
|
|
jbe@16
|
607 for (j=0; j<npoints; j++) {
|
|
jbe@16
|
608 /* return true if one point of inner cluster is in outer cluster */
|
|
jbe@16
|
609 if (pgl_point_in_cluster(points+j, outer)) return true;
|
|
jbe@16
|
610 }
|
|
jbe@16
|
611 }
|
|
jbe@16
|
612 /* otherwise return false */
|
|
jbe@16
|
613 return false;
|
|
jbe@16
|
614 }
|
|
jbe@16
|
615
|
|
jbe@16
|
616 /* check if line segment crosses line */
|
|
jbe@16
|
617 /* returns -1 if yes, 1 if no, and 0 in corner cases */
|
|
jbe@16
|
618 /* NOTE: each line (segment) must have a length greater than zero */
|
|
jbe@16
|
619 static inline double pgl_lseg_crosses_line(
|
|
jbe@16
|
620 double seg_x1, double seg_y1, double seg_x2, double seg_y2,
|
|
jbe@16
|
621 double line_x1, double line_y1, double line_x2, double line_y2,
|
|
jbe@16
|
622 bool strict
|
|
jbe@16
|
623 ) {
|
|
jbe@16
|
624 double value = (
|
|
jbe@16
|
625 (seg_x1-line_x1) * (line_y2-line_y1) -
|
|
jbe@16
|
626 (seg_y1-line_y1) * (line_x2-line_x1)
|
|
jbe@16
|
627 ) * (
|
|
jbe@16
|
628 (seg_x2-line_x1) * (line_y2-line_y1) -
|
|
jbe@16
|
629 (seg_y2-line_y1) * (line_x2-line_x1)
|
|
jbe@16
|
630 );
|
|
jbe@16
|
631 if (strict) return value < 0;
|
|
jbe@16
|
632 else return value <= 0;
|
|
jbe@16
|
633 }
|
|
jbe@16
|
634
|
|
jbe@16
|
635 /* check if paths and outlines of two clusters overlap */
|
|
jbe@16
|
636 /* (set strict to true to disregard corner cases) */
|
|
jbe@16
|
637 static bool pgl_outlines_overlap(
|
|
jbe@16
|
638 pgl_cluster *cluster1, pgl_cluster *cluster2, bool strict
|
|
jbe@16
|
639 ) {
|
|
jbe@16
|
640 int i1, j1, k1; /* i: entry, j: point in entry, k: next point in entry */
|
|
jbe@16
|
641 int i2, j2, k2;
|
|
jbe@16
|
642 int entrytype1, entrytype2; /* type of entry */
|
|
jbe@16
|
643 int npoints1, npoints2; /* number of points in entry */
|
|
jbe@16
|
644 pgl_point *points1; /* array of points in entry of cluster1 */
|
|
jbe@16
|
645 pgl_point *points2; /* array of points in entry of cluster2 */
|
|
jbe@16
|
646 int lon_dir1, lon_dir2; /* first vertex west (-1) or east (+1) */
|
|
jbe@16
|
647 double lon_break1, lon_break2; /* antipodal longitude of first vertex */
|
|
jbe@16
|
648 double lat11, lon11; /* latitude and (adjusted) longitude of vertex */
|
|
jbe@16
|
649 double lat12, lon12; /* latitude and (adjusted) longitude of next vertex */
|
|
jbe@16
|
650 double lat21, lon21; /* latitude and (adjusted) longitudes for cluster2 */
|
|
jbe@16
|
651 double lat22, lon22;
|
|
jbe@16
|
652 double wrapvalue; /* temporary helper value to adjust wrap-around */
|
|
jbe@16
|
653 /* iterate over all entries of cluster1 */
|
|
jbe@16
|
654 for (i1=0; i1<cluster1->nentries; i1++) {
|
|
jbe@16
|
655 /* get properties of entry in cluster1 and skip points */
|
|
jbe@16
|
656 npoints1 = cluster1->entries[i1].npoints;
|
|
jbe@16
|
657 if (npoints1 < 2) continue;
|
|
jbe@16
|
658 entrytype1 = cluster1->entries[i1].entrytype;
|
|
jbe@16
|
659 points1 = PGL_ENTRY_POINTS(cluster1, i1);
|
|
jbe@16
|
660 /* determine east/west orientation of first point and calculate antipodal
|
|
jbe@16
|
661 longitude */
|
|
jbe@16
|
662 lon_break1 = points1[0].lon;
|
|
jbe@16
|
663 if (lon_break1 < 0) {
|
|
jbe@16
|
664 lon_dir1 = -1;
|
|
jbe@16
|
665 lon_break1 = pgl_round(lon_break1 + 180);
|
|
jbe@16
|
666 } else if (lon_break1 > 0) {
|
|
jbe@16
|
667 lon_dir1 = 1;
|
|
jbe@16
|
668 lon_break1 = pgl_round(lon_break1 - 180);
|
|
jbe@16
|
669 } else lon_dir1 = 0;
|
|
jbe@16
|
670 /* iterate over all edges and vertices in cluster1 */
|
|
jbe@16
|
671 for (j1=0; j1<npoints1; j1++) {
|
|
jbe@16
|
672 /* calculate index of next vertex */
|
|
jbe@16
|
673 k1 = (j1+1) % npoints1;
|
|
jbe@16
|
674 /* skip last edge unless entry is (closed) outline or polygon */
|
|
jbe@16
|
675 if (
|
|
jbe@16
|
676 k1 == 0 &&
|
|
jbe@16
|
677 entrytype1 != PGL_ENTRY_OUTLINE &&
|
|
jbe@16
|
678 entrytype1 != PGL_ENTRY_POLYGON
|
|
jbe@16
|
679 ) continue;
|
|
jbe@16
|
680 /* use previously calculated values for lat1 and lon1 if possible */
|
|
jbe@16
|
681 if (j1) {
|
|
jbe@16
|
682 lat11 = lat12;
|
|
jbe@16
|
683 lon11 = lon12;
|
|
jbe@16
|
684 } else {
|
|
jbe@16
|
685 /* otherwise get latitude and longitude values of first vertex */
|
|
jbe@16
|
686 lat11 = points1[0].lat;
|
|
jbe@16
|
687 lon11 = points1[0].lon;
|
|
jbe@16
|
688 /* and consider longitude wrap-around for first vertex */
|
|
jbe@16
|
689 if (lon_dir1<0 && lon11>lon_break1) lon11 = pgl_round(lon11-360);
|
|
jbe@16
|
690 else if (lon_dir1>0 && lon11<lon_break1) lon11 = pgl_round(lon11+360);
|
|
jbe@16
|
691 }
|
|
jbe@16
|
692 /* get latitude and longitude of next vertex */
|
|
jbe@16
|
693 lat12 = points1[k1].lat;
|
|
jbe@16
|
694 lon12 = points1[k1].lon;
|
|
jbe@16
|
695 /* consider longitude wrap-around for next vertex */
|
|
jbe@16
|
696 if (lon_dir1<0 && lon12>lon_break1) lon12 = pgl_round(lon12-360);
|
|
jbe@16
|
697 else if (lon_dir1>0 && lon12<lon_break1) lon12 = pgl_round(lon12+360);
|
|
jbe@16
|
698 /* skip degenerated edges */
|
|
jbe@16
|
699 if (lat11 == lat12 && lon11 == lon12) continue;
|
|
jbe@16
|
700 /* iterate over all entries of cluster2 */
|
|
jbe@16
|
701 for (i2=0; i2<cluster2->nentries; i2++) {
|
|
jbe@16
|
702 /* get points and number of points of entry in cluster2 */
|
|
jbe@16
|
703 npoints2 = cluster2->entries[i2].npoints;
|
|
jbe@16
|
704 if (npoints2 < 2) continue;
|
|
jbe@16
|
705 entrytype2 = cluster2->entries[i2].entrytype;
|
|
jbe@16
|
706 points2 = PGL_ENTRY_POINTS(cluster2, i2);
|
|
jbe@16
|
707 /* determine east/west orientation of first point and calculate antipodal
|
|
jbe@16
|
708 longitude */
|
|
jbe@16
|
709 lon_break2 = points2[0].lon;
|
|
jbe@16
|
710 if (lon_break2 < 0) {
|
|
jbe@16
|
711 lon_dir2 = -1;
|
|
jbe@16
|
712 lon_break2 = pgl_round(lon_break2 + 180);
|
|
jbe@16
|
713 } else if (lon_break2 > 0) {
|
|
jbe@16
|
714 lon_dir2 = 1;
|
|
jbe@16
|
715 lon_break2 = pgl_round(lon_break2 - 180);
|
|
jbe@16
|
716 } else lon_dir2 = 0;
|
|
jbe@16
|
717 /* iterate over all edges and vertices in cluster2 */
|
|
jbe@16
|
718 for (j2=0; j2<npoints2; j2++) {
|
|
jbe@16
|
719 /* calculate index of next vertex */
|
|
jbe@16
|
720 k2 = (j2+1) % npoints2;
|
|
jbe@16
|
721 /* skip last edge unless entry is (closed) outline or polygon */
|
|
jbe@16
|
722 if (
|
|
jbe@16
|
723 k2 == 0 &&
|
|
jbe@16
|
724 entrytype2 != PGL_ENTRY_OUTLINE &&
|
|
jbe@16
|
725 entrytype2 != PGL_ENTRY_POLYGON
|
|
jbe@16
|
726 ) continue;
|
|
jbe@16
|
727 /* use previously calculated values for lat1 and lon1 if possible */
|
|
jbe@16
|
728 if (j2) {
|
|
jbe@16
|
729 lat21 = lat22;
|
|
jbe@16
|
730 lon21 = lon22;
|
|
jbe@16
|
731 } else {
|
|
jbe@16
|
732 /* otherwise get latitude and longitude values of first vertex */
|
|
jbe@16
|
733 lat21 = points2[0].lat;
|
|
jbe@16
|
734 lon21 = points2[0].lon;
|
|
jbe@16
|
735 /* and consider longitude wrap-around for first vertex */
|
|
jbe@16
|
736 if (lon_dir2<0 && lon21>lon_break2) lon21 = pgl_round(lon21-360);
|
|
jbe@16
|
737 else if (lon_dir2>0 && lon21<lon_break2) lon21 = pgl_round(lon21+360);
|
|
jbe@16
|
738 }
|
|
jbe@16
|
739 /* get latitude and longitude of next vertex */
|
|
jbe@16
|
740 lat22 = points2[k2].lat;
|
|
jbe@16
|
741 lon22 = points2[k2].lon;
|
|
jbe@16
|
742 /* consider longitude wrap-around for next vertex */
|
|
jbe@16
|
743 if (lon_dir2<0 && lon22>lon_break2) lon22 = pgl_round(lon22-360);
|
|
jbe@16
|
744 else if (lon_dir2>0 && lon22<lon_break2) lon22 = pgl_round(lon22+360);
|
|
jbe@16
|
745 /* skip degenerated edges */
|
|
jbe@16
|
746 if (lat21 == lat22 && lon21 == lon22) continue;
|
|
jbe@16
|
747 /* perform another wrap-around where necessary */
|
|
jbe@16
|
748 /* TODO: improve performance of whole wrap-around mechanism */
|
|
jbe@16
|
749 wrapvalue = (lon21 + lon22) - (lon11 + lon12);
|
|
jbe@16
|
750 if (wrapvalue > 360) {
|
|
jbe@16
|
751 lon21 = pgl_round(lon21 - 360);
|
|
jbe@16
|
752 lon22 = pgl_round(lon22 - 360);
|
|
jbe@16
|
753 } else if (wrapvalue < -360) {
|
|
jbe@16
|
754 lon21 = pgl_round(lon21 + 360);
|
|
jbe@16
|
755 lon22 = pgl_round(lon22 + 360);
|
|
jbe@16
|
756 }
|
|
jbe@16
|
757 /* return true if segments overlap */
|
|
jbe@16
|
758 if (
|
|
jbe@16
|
759 pgl_lseg_crosses_line(
|
|
jbe@16
|
760 lat11, lon11, lat12, lon12,
|
|
jbe@16
|
761 lat21, lon21, lat22, lon22,
|
|
jbe@16
|
762 strict
|
|
jbe@16
|
763 ) && pgl_lseg_crosses_line(
|
|
jbe@16
|
764 lat21, lon21, lat22, lon22,
|
|
jbe@16
|
765 lat11, lon11, lat12, lon12,
|
|
jbe@16
|
766 strict
|
|
jbe@16
|
767 )
|
|
jbe@16
|
768 ) {
|
|
jbe@16
|
769 return true;
|
|
jbe@16
|
770 }
|
|
jbe@16
|
771 }
|
|
jbe@16
|
772 }
|
|
jbe@16
|
773 }
|
|
jbe@16
|
774 }
|
|
jbe@16
|
775 /* otherwise return false */
|
|
jbe@16
|
776 return false;
|
|
jbe@16
|
777 }
|
|
jbe@16
|
778
|
|
jbe@16
|
779 /* check if second cluster is completely contained in first cluster */
|
|
jbe@16
|
780 static bool pgl_cluster_in_cluster(pgl_cluster *outer, pgl_cluster *inner) {
|
|
jbe@16
|
781 if (!pgl_all_cluster_points_in_cluster(outer, inner)) return false;
|
|
jbe@16
|
782 if (pgl_outlines_overlap(outer, inner, true)) return false;
|
|
jbe@16
|
783 return true;
|
|
jbe@16
|
784 }
|
|
jbe@16
|
785
|
|
jbe@16
|
786 /* check if two clusters overlap */
|
|
jbe@16
|
787 static bool pgl_clusters_overlap(
|
|
jbe@16
|
788 pgl_cluster *cluster1, pgl_cluster *cluster2
|
|
jbe@16
|
789 ) {
|
|
jbe@16
|
790 if (pgl_any_cluster_points_in_cluster(cluster1, cluster2)) return true;
|
|
jbe@16
|
791 if (pgl_any_cluster_points_in_cluster(cluster2, cluster1)) return true;
|
|
jbe@16
|
792 if (pgl_outlines_overlap(cluster1, cluster2, false)) return true;
|
|
jbe@16
|
793 return false;
|
|
jbe@16
|
794 }
|
|
jbe@16
|
795
|
|
jbe@16
|
796
|
|
jbe@0
|
797 /* calculate (approximate) distance between point and cluster */
|
|
jbe@0
|
798 static double pgl_point_cluster_distance(pgl_point *point, pgl_cluster *cluster) {
|
|
jbe@0
|
799 int i, j, k; /* i: entry, j: point in entry, k: next point in entry */
|
|
jbe@0
|
800 int entrytype; /* type of entry */
|
|
jbe@0
|
801 int npoints; /* number of points in entry */
|
|
jbe@0
|
802 pgl_point *points; /* array of points in entry */
|
|
jbe@0
|
803 int lon_dir = 0; /* first vertex west (-1) or east (+1) */
|
|
jbe@0
|
804 double lon_break = 0; /* antipodal longitude of first vertex */
|
|
jbe@0
|
805 double lon_min = 0; /* minimum (adjusted) longitude of entry vertices */
|
|
jbe@0
|
806 double lon_max = 0; /* maximum (adjusted) longitude of entry vertices */
|
|
jbe@0
|
807 double lat0 = point->lat; /* latitude of point */
|
|
jbe@0
|
808 double lon0; /* (adjusted) longitude of point */
|
|
jbe@0
|
809 double lat1, lon1; /* latitude and (adjusted) longitude of vertex */
|
|
jbe@0
|
810 double lat2, lon2; /* latitude and (adjusted) longitude of next vertex */
|
|
jbe@0
|
811 double s; /* scalar for vector calculations */
|
|
jbe@0
|
812 double dist; /* distance calculated in one step */
|
|
jbe@0
|
813 double min_dist = INFINITY; /* minimum distance */
|
|
jbe@0
|
814 /* distance is zero if point is contained in cluster */
|
|
jbe@0
|
815 if (pgl_point_in_cluster(point, cluster)) return 0;
|
|
jbe@0
|
816 /* iterate over all entries */
|
|
jbe@0
|
817 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
818 /* get properties of entry */
|
|
jbe@0
|
819 entrytype = cluster->entries[i].entrytype;
|
|
jbe@0
|
820 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
821 points = PGL_ENTRY_POINTS(cluster, i);
|
|
jbe@0
|
822 /* determine east/west orientation of first point of entry and calculate
|
|
jbe@0
|
823 antipodal longitude */
|
|
jbe@0
|
824 lon_break = points[0].lon;
|
|
jbe@0
|
825 if (lon_break < 0) { lon_dir = -1; lon_break += 180; }
|
|
jbe@0
|
826 else if (lon_break > 0) { lon_dir = 1; lon_break -= 180; }
|
|
jbe@0
|
827 else lon_dir = 0;
|
|
jbe@0
|
828 /* determine covered longitude range */
|
|
jbe@0
|
829 for (j=0; j<npoints; j++) {
|
|
jbe@0
|
830 /* get longitude of vertex */
|
|
jbe@0
|
831 lon1 = points[j].lon;
|
|
jbe@0
|
832 /* adjust longitude to fix potential wrap-around */
|
|
jbe@0
|
833 if (lon_dir < 0 && lon1 > lon_break) lon1 -= 360;
|
|
jbe@0
|
834 else if (lon_dir > 0 && lon1 < lon_break) lon1 += 360;
|
|
jbe@0
|
835 /* update minimum and maximum longitude of polygon */
|
|
jbe@0
|
836 if (j == 0 || lon1 < lon_min) lon_min = lon1;
|
|
jbe@0
|
837 if (j == 0 || lon1 > lon_max) lon_max = lon1;
|
|
jbe@0
|
838 }
|
|
jbe@0
|
839 /* adjust longitude wrap-around according to full longitude range */
|
|
jbe@0
|
840 lon_break = (lon_max + lon_min) / 2;
|
|
jbe@0
|
841 if (lon_break < 0) { lon_dir = -1; lon_break += 180; }
|
|
jbe@0
|
842 else if (lon_break > 0) { lon_dir = 1; lon_break -= 180; }
|
|
jbe@0
|
843 /* get longitude of point */
|
|
jbe@0
|
844 lon0 = point->lon;
|
|
jbe@0
|
845 /* consider longitude wrap-around for point */
|
|
jbe@0
|
846 if (lon_dir < 0 && lon0 > lon_break) lon0 -= 360;
|
|
jbe@0
|
847 else if (lon_dir > 0 && lon0 < lon_break) lon0 += 360;
|
|
jbe@0
|
848 /* iterate over all edges and vertices */
|
|
jbe@0
|
849 for (j=0; j<npoints; j++) {
|
|
jbe@16
|
850 /* use previously calculated values for lat1 and lon1 if possible */
|
|
jbe@16
|
851 if (j) {
|
|
jbe@16
|
852 lat1 = lat2;
|
|
jbe@16
|
853 lon1 = lon2;
|
|
jbe@16
|
854 } else {
|
|
jbe@16
|
855 /* otherwise get latitude and longitude values of first vertex */
|
|
jbe@16
|
856 lat1 = points[0].lat;
|
|
jbe@16
|
857 lon1 = points[0].lon;
|
|
jbe@16
|
858 /* and consider longitude wrap-around for first vertex */
|
|
jbe@16
|
859 if (lon_dir < 0 && lon1 > lon_break) lon1 -= 360;
|
|
jbe@16
|
860 else if (lon_dir > 0 && lon1 < lon_break) lon1 += 360;
|
|
jbe@16
|
861 }
|
|
jbe@0
|
862 /* calculate distance to vertex */
|
|
jbe@0
|
863 dist = pgl_distance(lat0, lon0, lat1, lon1);
|
|
jbe@0
|
864 /* store calculated distance if smallest */
|
|
jbe@0
|
865 if (dist < min_dist) min_dist = dist;
|
|
jbe@0
|
866 /* calculate index of next vertex */
|
|
jbe@0
|
867 k = (j+1) % npoints;
|
|
jbe@0
|
868 /* skip last edge unless entry is (closed) outline or polygon */
|
|
jbe@0
|
869 if (
|
|
jbe@0
|
870 k == 0 &&
|
|
jbe@0
|
871 entrytype != PGL_ENTRY_OUTLINE &&
|
|
jbe@0
|
872 entrytype != PGL_ENTRY_POLYGON
|
|
jbe@0
|
873 ) continue;
|
|
jbe@16
|
874 /* get latitude and longitude of next vertex */
|
|
jbe@0
|
875 lat2 = points[k].lat;
|
|
jbe@0
|
876 lon2 = points[k].lon;
|
|
jbe@16
|
877 /* consider longitude wrap-around for next vertex */
|
|
jbe@0
|
878 if (lon_dir < 0 && lon2 > lon_break) lon2 -= 360;
|
|
jbe@0
|
879 else if (lon_dir > 0 && lon2 < lon_break) lon2 += 360;
|
|
jbe@0
|
880 /* go to next vertex and edge if edge is degenerated */
|
|
jbe@0
|
881 if (lat1 == lat2 && lon1 == lon2) continue;
|
|
jbe@0
|
882 /* otherwise test if point can be projected onto edge of polygon */
|
|
jbe@0
|
883 s = (
|
|
jbe@0
|
884 ((lat0-lat1) * (lat2-lat1) + (lon0-lon1) * (lon2-lon1)) /
|
|
jbe@0
|
885 ((lat2-lat1) * (lat2-lat1) + (lon2-lon1) * (lon2-lon1))
|
|
jbe@0
|
886 );
|
|
jbe@0
|
887 /* go to next vertex and edge if point cannot be projected */
|
|
jbe@0
|
888 if (!(s > 0 && s < 1)) continue;
|
|
jbe@0
|
889 /* calculate distance from original point to projected point */
|
|
jbe@0
|
890 dist = pgl_distance(
|
|
jbe@0
|
891 lat0, lon0,
|
|
jbe@0
|
892 lat1 + s * (lat2-lat1),
|
|
jbe@0
|
893 lon1 + s * (lon2-lon1)
|
|
jbe@0
|
894 );
|
|
jbe@0
|
895 /* store calculated distance if smallest */
|
|
jbe@0
|
896 if (dist < min_dist) min_dist = dist;
|
|
jbe@0
|
897 }
|
|
jbe@0
|
898 }
|
|
jbe@0
|
899 /* return minimum distance */
|
|
jbe@0
|
900 return min_dist;
|
|
jbe@0
|
901 }
|
|
jbe@0
|
902
|
|
jbe@16
|
903 /* calculate (approximate) distance between two clusters */
|
|
jbe@16
|
904 static double pgl_cluster_distance(pgl_cluster *cluster1, pgl_cluster *cluster2) {
|
|
jbe@16
|
905 int i, j; /* i: entry, j: point in entry */
|
|
jbe@16
|
906 int npoints; /* number of points in entry */
|
|
jbe@16
|
907 pgl_point *points; /* array of points in entry */
|
|
jbe@16
|
908 double dist; /* distance calculated in one step */
|
|
jbe@16
|
909 double min_dist = INFINITY; /* minimum distance */
|
|
jbe@16
|
910 /* consider distance from each point in one cluster to the whole other */
|
|
jbe@16
|
911 for (i=0; i<cluster1->nentries; i++) {
|
|
jbe@16
|
912 npoints = cluster1->entries[i].npoints;
|
|
jbe@16
|
913 points = PGL_ENTRY_POINTS(cluster1, i);
|
|
jbe@16
|
914 for (j=0; j<npoints; j++) {
|
|
jbe@16
|
915 dist = pgl_point_cluster_distance(points+j, cluster2);
|
|
jbe@16
|
916 if (dist == 0) return dist;
|
|
jbe@16
|
917 if (dist < min_dist) min_dist = dist;
|
|
jbe@16
|
918 }
|
|
jbe@16
|
919 }
|
|
jbe@16
|
920 /* consider distance from each point in other cluster to the first cluster */
|
|
jbe@16
|
921 for (i=0; i<cluster2->nentries; i++) {
|
|
jbe@16
|
922 npoints = cluster2->entries[i].npoints;
|
|
jbe@16
|
923 points = PGL_ENTRY_POINTS(cluster2, i);
|
|
jbe@16
|
924 for (j=0; j<npoints; j++) {
|
|
jbe@16
|
925 dist = pgl_point_cluster_distance(points+j, cluster1);
|
|
jbe@16
|
926 if (dist == 0) return dist;
|
|
jbe@16
|
927 if (dist < min_dist) min_dist = dist;
|
|
jbe@16
|
928 }
|
|
jbe@16
|
929 }
|
|
jbe@16
|
930 return min_dist;
|
|
jbe@16
|
931 }
|
|
jbe@16
|
932
|
|
jbe@0
|
933 /* estimator function for distance between box and point */
|
|
jbe@16
|
934 /* always returns a smaller value than actually correct or zero */
|
|
jbe@0
|
935 static double pgl_estimate_point_box_distance(pgl_point *point, pgl_box *box) {
|
|
jbe@16
|
936 double dlon; /* longitude range of box (delta longitude) */
|
|
jbe@16
|
937 double distance; /* return value */
|
|
jbe@16
|
938 /* return infinity if box is empty */
|
|
jbe@0
|
939 if (box->lat_min > box->lat_max) return INFINITY;
|
|
jbe@16
|
940 /* return zero if point is inside box */
|
|
jbe@0
|
941 if (pgl_point_in_box(point, box)) return 0;
|
|
jbe@0
|
942 /* calculate delta longitude */
|
|
jbe@0
|
943 dlon = box->lon_max - box->lon_min;
|
|
jbe@0
|
944 if (dlon < 0) dlon += 360; /* 180th meridian crossed */
|
|
jbe@16
|
945 /* if delta longitude is greater than 150 degrees, perform safe fall-back */
|
|
jbe@16
|
946 if (dlon > 150) return 0;
|
|
jbe@16
|
947 /* calculate lower limit for distance (formula below requires dlon <= 150) */
|
|
jbe@16
|
948 /* TODO: provide better estimation function to improve performance */
|
|
jbe@16
|
949 distance = (
|
|
jbe@16
|
950 (1.0-1e-14) * pgl_distance(
|
|
jbe@16
|
951 point->lat,
|
|
jbe@16
|
952 point->lon,
|
|
jbe@16
|
953 (box->lat_min + box->lat_max) / 2,
|
|
jbe@16
|
954 box->lon_min + dlon/2
|
|
jbe@16
|
955 ) - pgl_distance(
|
|
jbe@16
|
956 box->lat_min, box->lon_min,
|
|
jbe@16
|
957 box->lat_max, box->lon_max
|
|
jbe@16
|
958 )
|
|
jbe@16
|
959 );
|
|
jbe@16
|
960 /* truncate negative results to zero */
|
|
jbe@16
|
961 if (distance <= 0) distance = 0;
|
|
jbe@16
|
962 /* return result */
|
|
jbe@16
|
963 return distance;
|
|
jbe@0
|
964 }
|
|
jbe@0
|
965
|
|
jbe@0
|
966
|
|
jbe@16
|
967 /*-------------------------------------------------*
|
|
jbe@16
|
968 * geographic index based on space-filling curve *
|
|
jbe@16
|
969 *-------------------------------------------------*/
|
|
jbe@0
|
970
|
|
jbe@0
|
971 /* number of bytes used for geographic (center) position in keys */
|
|
jbe@0
|
972 #define PGL_KEY_LATLON_BYTELEN 7
|
|
jbe@0
|
973
|
|
jbe@0
|
974 /* maximum reference value for logarithmic size of geographic objects */
|
|
jbe@0
|
975 #define PGL_AREAKEY_REFOBJSIZE (PGL_DIAMETER/3.0) /* can be tweaked */
|
|
jbe@0
|
976
|
|
jbe@0
|
977 /* pointer to index key (either pgl_pointkey or pgl_areakey) */
|
|
jbe@0
|
978 typedef unsigned char *pgl_keyptr;
|
|
jbe@0
|
979
|
|
jbe@0
|
980 /* index key for points (objects with zero area) on the spheroid */
|
|
jbe@0
|
981 /* bit 0..55: interspersed bits of latitude and longitude,
|
|
jbe@0
|
982 bit 56..57: always zero,
|
|
jbe@0
|
983 bit 58..63: node depth in hypothetic (full) tree from 0 to 56 (incl.) */
|
|
jbe@0
|
984 typedef unsigned char pgl_pointkey[PGL_KEY_LATLON_BYTELEN+1];
|
|
jbe@0
|
985
|
|
jbe@0
|
986 /* index key for geographic objects on spheroid with area greater than zero */
|
|
jbe@0
|
987 /* bit 0..55: interspersed bits of latitude and longitude of center point,
|
|
jbe@0
|
988 bit 56: always set to 1,
|
|
jbe@0
|
989 bit 57..63: node depth in hypothetic (full) tree from 0 to (2*56)+1 (incl.),
|
|
jbe@0
|
990 bit 64..71: logarithmic object size from 0 to 56+1 = 57 (incl.), but set to
|
|
jbe@0
|
991 PGL_KEY_OBJSIZE_EMPTY (with interspersed bits = 0 and node depth
|
|
jbe@0
|
992 = 113) for empty objects, and set to PGL_KEY_OBJSIZE_UNIVERSAL
|
|
jbe@0
|
993 (with interspersed bits = 0 and node depth = 0) for keys which
|
|
jbe@0
|
994 cover both empty and non-empty objects */
|
|
jbe@0
|
995
|
|
jbe@0
|
996 typedef unsigned char pgl_areakey[PGL_KEY_LATLON_BYTELEN+2];
|
|
jbe@0
|
997
|
|
jbe@0
|
998 /* helper macros for reading/writing index keys */
|
|
jbe@0
|
999 #define PGL_KEY_NODEDEPTH_OFFSET PGL_KEY_LATLON_BYTELEN
|
|
jbe@0
|
1000 #define PGL_KEY_OBJSIZE_OFFSET (PGL_KEY_NODEDEPTH_OFFSET+1)
|
|
jbe@0
|
1001 #define PGL_POINTKEY_MAXDEPTH (PGL_KEY_LATLON_BYTELEN*8)
|
|
jbe@0
|
1002 #define PGL_AREAKEY_MAXDEPTH (2*PGL_POINTKEY_MAXDEPTH+1)
|
|
jbe@0
|
1003 #define PGL_AREAKEY_MAXOBJSIZE (PGL_POINTKEY_MAXDEPTH+1)
|
|
jbe@0
|
1004 #define PGL_AREAKEY_TYPEMASK 0x80
|
|
jbe@0
|
1005 #define PGL_KEY_LATLONBIT(key, n) ((key)[(n)/8] & (0x80 >> ((n)%8)))
|
|
jbe@0
|
1006 #define PGL_KEY_LATLONBIT_DIFF(key1, key2, n) \
|
|
jbe@0
|
1007 ( PGL_KEY_LATLONBIT(key1, n) ^ \
|
|
jbe@0
|
1008 PGL_KEY_LATLONBIT(key2, n) )
|
|
jbe@0
|
1009 #define PGL_KEY_IS_AREAKEY(key) ((key)[PGL_KEY_NODEDEPTH_OFFSET] & \
|
|
jbe@0
|
1010 PGL_AREAKEY_TYPEMASK)
|
|
jbe@0
|
1011 #define PGL_KEY_NODEDEPTH(key) ((key)[PGL_KEY_NODEDEPTH_OFFSET] & \
|
|
jbe@0
|
1012 (PGL_AREAKEY_TYPEMASK-1))
|
|
jbe@0
|
1013 #define PGL_KEY_OBJSIZE(key) ((key)[PGL_KEY_OBJSIZE_OFFSET])
|
|
jbe@0
|
1014 #define PGL_KEY_OBJSIZE_EMPTY 126
|
|
jbe@0
|
1015 #define PGL_KEY_OBJSIZE_UNIVERSAL 127
|
|
jbe@0
|
1016 #define PGL_KEY_IS_EMPTY(key) ( PGL_KEY_IS_AREAKEY(key) && \
|
|
jbe@0
|
1017 (key)[PGL_KEY_OBJSIZE_OFFSET] == \
|
|
jbe@0
|
1018 PGL_KEY_OBJSIZE_EMPTY )
|
|
jbe@0
|
1019 #define PGL_KEY_IS_UNIVERSAL(key) ( PGL_KEY_IS_AREAKEY(key) && \
|
|
jbe@0
|
1020 (key)[PGL_KEY_OBJSIZE_OFFSET] == \
|
|
jbe@0
|
1021 PGL_KEY_OBJSIZE_UNIVERSAL )
|
|
jbe@0
|
1022
|
|
jbe@0
|
1023 /* set area key to match empty objects only */
|
|
jbe@0
|
1024 static void pgl_key_set_empty(pgl_keyptr key) {
|
|
jbe@0
|
1025 memset(key, 0, sizeof(pgl_areakey));
|
|
jbe@0
|
1026 /* Note: setting node depth to maximum is required for picksplit function */
|
|
jbe@0
|
1027 key[PGL_KEY_NODEDEPTH_OFFSET] = PGL_AREAKEY_TYPEMASK | PGL_AREAKEY_MAXDEPTH;
|
|
jbe@0
|
1028 key[PGL_KEY_OBJSIZE_OFFSET] = PGL_KEY_OBJSIZE_EMPTY;
|
|
jbe@0
|
1029 }
|
|
jbe@0
|
1030
|
|
jbe@0
|
1031 /* set area key to match any object (including empty objects) */
|
|
jbe@0
|
1032 static void pgl_key_set_universal(pgl_keyptr key) {
|
|
jbe@0
|
1033 memset(key, 0, sizeof(pgl_areakey));
|
|
jbe@0
|
1034 key[PGL_KEY_NODEDEPTH_OFFSET] = PGL_AREAKEY_TYPEMASK;
|
|
jbe@0
|
1035 key[PGL_KEY_OBJSIZE_OFFSET] = PGL_KEY_OBJSIZE_UNIVERSAL;
|
|
jbe@0
|
1036 }
|
|
jbe@0
|
1037
|
|
jbe@0
|
1038 /* convert a point on earth into a max-depth key to be used in index */
|
|
jbe@0
|
1039 static void pgl_point_to_key(pgl_point *point, pgl_keyptr key) {
|
|
jbe@0
|
1040 double lat = point->lat;
|
|
jbe@0
|
1041 double lon = point->lon;
|
|
jbe@0
|
1042 int i;
|
|
jbe@0
|
1043 /* clear latitude and longitude bits */
|
|
jbe@0
|
1044 memset(key, 0, PGL_KEY_LATLON_BYTELEN);
|
|
jbe@0
|
1045 /* set node depth to maximum and type bit to zero */
|
|
jbe@0
|
1046 key[PGL_KEY_NODEDEPTH_OFFSET] = PGL_POINTKEY_MAXDEPTH;
|
|
jbe@0
|
1047 /* iterate over all latitude/longitude bit pairs */
|
|
jbe@0
|
1048 for (i=0; i<PGL_POINTKEY_MAXDEPTH/2; i++) {
|
|
jbe@0
|
1049 /* determine latitude bit */
|
|
jbe@0
|
1050 if (lat >= 0) {
|
|
jbe@0
|
1051 key[i/4] |= 0x80 >> (2*(i%4));
|
|
jbe@0
|
1052 lat *= 2; lat -= 90;
|
|
jbe@0
|
1053 } else {
|
|
jbe@0
|
1054 lat *= 2; lat += 90;
|
|
jbe@0
|
1055 }
|
|
jbe@0
|
1056 /* determine longitude bit */
|
|
jbe@0
|
1057 if (lon >= 0) {
|
|
jbe@0
|
1058 key[i/4] |= 0x80 >> (2*(i%4)+1);
|
|
jbe@0
|
1059 lon *= 2; lon -= 180;
|
|
jbe@0
|
1060 } else {
|
|
jbe@0
|
1061 lon *= 2; lon += 180;
|
|
jbe@0
|
1062 }
|
|
jbe@0
|
1063 }
|
|
jbe@0
|
1064 }
|
|
jbe@0
|
1065
|
|
jbe@0
|
1066 /* convert a circle on earth into a max-depth key to be used in an index */
|
|
jbe@0
|
1067 static void pgl_circle_to_key(pgl_circle *circle, pgl_keyptr key) {
|
|
jbe@0
|
1068 /* handle special case of empty circle */
|
|
jbe@0
|
1069 if (circle->radius < 0) {
|
|
jbe@0
|
1070 pgl_key_set_empty(key);
|
|
jbe@0
|
1071 return;
|
|
jbe@0
|
1072 }
|
|
jbe@0
|
1073 /* perform same action as for point keys */
|
|
jbe@0
|
1074 pgl_point_to_key(&(circle->center), key);
|
|
jbe@0
|
1075 /* but overwrite type and node depth to fit area index key */
|
|
jbe@0
|
1076 key[PGL_KEY_NODEDEPTH_OFFSET] = PGL_AREAKEY_TYPEMASK | PGL_AREAKEY_MAXDEPTH;
|
|
jbe@0
|
1077 /* check if radius is greater than (or equal to) reference size */
|
|
jbe@0
|
1078 /* (treat equal values as greater values for numerical safety) */
|
|
jbe@0
|
1079 if (circle->radius >= PGL_AREAKEY_REFOBJSIZE) {
|
|
jbe@0
|
1080 /* if yes, set logarithmic size to zero */
|
|
jbe@0
|
1081 key[PGL_KEY_OBJSIZE_OFFSET] = 0;
|
|
jbe@0
|
1082 } else {
|
|
jbe@0
|
1083 /* otherwise, determine logarithmic size iteratively */
|
|
jbe@0
|
1084 /* (one step is equivalent to a factor of sqrt(2)) */
|
|
jbe@0
|
1085 double reference = PGL_AREAKEY_REFOBJSIZE / M_SQRT2;
|
|
jbe@0
|
1086 int objsize = 1;
|
|
jbe@0
|
1087 while (objsize < PGL_AREAKEY_MAXOBJSIZE) {
|
|
jbe@0
|
1088 /* stop when radius is greater than (or equal to) adjusted reference */
|
|
jbe@0
|
1089 /* (treat equal values as greater values for numerical safety) */
|
|
jbe@0
|
1090 if (circle->radius >= reference) break;
|
|
jbe@0
|
1091 reference /= M_SQRT2;
|
|
jbe@0
|
1092 objsize++;
|
|
jbe@0
|
1093 }
|
|
jbe@0
|
1094 /* set logarithmic size to determined value */
|
|
jbe@0
|
1095 key[PGL_KEY_OBJSIZE_OFFSET] = objsize;
|
|
jbe@0
|
1096 }
|
|
jbe@0
|
1097 }
|
|
jbe@0
|
1098
|
|
jbe@0
|
1099 /* check if one key is subkey of another key or vice versa */
|
|
jbe@0
|
1100 static bool pgl_keys_overlap(pgl_keyptr key1, pgl_keyptr key2) {
|
|
jbe@0
|
1101 int i; /* key bit offset (includes both lat/lon and log. obj. size bits) */
|
|
jbe@0
|
1102 /* determine smallest depth */
|
|
jbe@0
|
1103 int depth1 = PGL_KEY_NODEDEPTH(key1);
|
|
jbe@0
|
1104 int depth2 = PGL_KEY_NODEDEPTH(key2);
|
|
jbe@0
|
1105 int depth = (depth1 < depth2) ? depth1 : depth2;
|
|
jbe@0
|
1106 /* check if keys are area keys (assuming that both keys have same type) */
|
|
jbe@0
|
1107 if (PGL_KEY_IS_AREAKEY(key1)) {
|
|
jbe@0
|
1108 int j = 0; /* bit offset for logarithmic object size bits */
|
|
jbe@0
|
1109 int k = 0; /* bit offset for latitude and longitude */
|
|
jbe@0
|
1110 /* fetch logarithmic object size information */
|
|
jbe@0
|
1111 int objsize1 = PGL_KEY_OBJSIZE(key1);
|
|
jbe@0
|
1112 int objsize2 = PGL_KEY_OBJSIZE(key2);
|
|
jbe@0
|
1113 /* handle special cases for empty objects (universal and empty keys) */
|
|
jbe@0
|
1114 if (
|
|
jbe@0
|
1115 objsize1 == PGL_KEY_OBJSIZE_UNIVERSAL ||
|
|
jbe@0
|
1116 objsize2 == PGL_KEY_OBJSIZE_UNIVERSAL
|
|
jbe@0
|
1117 ) return true;
|
|
jbe@0
|
1118 if (
|
|
jbe@0
|
1119 objsize1 == PGL_KEY_OBJSIZE_EMPTY ||
|
|
jbe@0
|
1120 objsize2 == PGL_KEY_OBJSIZE_EMPTY
|
|
jbe@0
|
1121 ) return objsize1 == objsize2;
|
|
jbe@0
|
1122 /* iterate through key bits */
|
|
jbe@0
|
1123 for (i=0; i<depth; i++) {
|
|
jbe@0
|
1124 /* every second bit is a bit describing the object size */
|
|
jbe@0
|
1125 if (i%2 == 0) {
|
|
jbe@0
|
1126 /* check if object size bit is different in both keys (objsize1 and
|
|
jbe@0
|
1127 objsize2 describe the minimum index when object size bit is set) */
|
|
jbe@0
|
1128 if (
|
|
jbe@0
|
1129 (objsize1 <= j && objsize2 > j) ||
|
|
jbe@0
|
1130 (objsize2 <= j && objsize1 > j)
|
|
jbe@0
|
1131 ) {
|
|
jbe@0
|
1132 /* bit differs, therefore keys are in separate branches */
|
|
jbe@0
|
1133 return false;
|
|
jbe@0
|
1134 }
|
|
jbe@0
|
1135 /* increase bit counter for object size bits */
|
|
jbe@0
|
1136 j++;
|
|
jbe@0
|
1137 }
|
|
jbe@0
|
1138 /* all other bits describe latitude and longitude */
|
|
jbe@0
|
1139 else {
|
|
jbe@0
|
1140 /* check if bit differs in both keys */
|
|
jbe@0
|
1141 if (PGL_KEY_LATLONBIT_DIFF(key1, key2, k)) {
|
|
jbe@0
|
1142 /* bit differs, therefore keys are in separate branches */
|
|
jbe@0
|
1143 return false;
|
|
jbe@0
|
1144 }
|
|
jbe@0
|
1145 /* increase bit counter for latitude/longitude bits */
|
|
jbe@0
|
1146 k++;
|
|
jbe@0
|
1147 }
|
|
jbe@0
|
1148 }
|
|
jbe@0
|
1149 }
|
|
jbe@0
|
1150 /* if not, keys are point keys */
|
|
jbe@0
|
1151 else {
|
|
jbe@0
|
1152 /* iterate through key bits */
|
|
jbe@0
|
1153 for (i=0; i<depth; i++) {
|
|
jbe@0
|
1154 /* check if bit differs in both keys */
|
|
jbe@0
|
1155 if (PGL_KEY_LATLONBIT_DIFF(key1, key2, i)) {
|
|
jbe@0
|
1156 /* bit differs, therefore keys are in separate branches */
|
|
jbe@0
|
1157 return false;
|
|
jbe@0
|
1158 }
|
|
jbe@0
|
1159 }
|
|
jbe@0
|
1160 }
|
|
jbe@0
|
1161 /* return true because keys are in the same branch */
|
|
jbe@0
|
1162 return true;
|
|
jbe@0
|
1163 }
|
|
jbe@0
|
1164
|
|
jbe@0
|
1165 /* combine two keys into new key which covers both original keys */
|
|
jbe@0
|
1166 /* (result stored in first argument) */
|
|
jbe@0
|
1167 static void pgl_unite_keys(pgl_keyptr dst, pgl_keyptr src) {
|
|
jbe@0
|
1168 int i; /* key bit offset (includes both lat/lon and log. obj. size bits) */
|
|
jbe@0
|
1169 /* determine smallest depth */
|
|
jbe@0
|
1170 int depth1 = PGL_KEY_NODEDEPTH(dst);
|
|
jbe@0
|
1171 int depth2 = PGL_KEY_NODEDEPTH(src);
|
|
jbe@0
|
1172 int depth = (depth1 < depth2) ? depth1 : depth2;
|
|
jbe@0
|
1173 /* check if keys are area keys (assuming that both keys have same type) */
|
|
jbe@0
|
1174 if (PGL_KEY_IS_AREAKEY(dst)) {
|
|
jbe@0
|
1175 pgl_areakey dstbuf = { 0, }; /* destination buffer (cleared) */
|
|
jbe@0
|
1176 int j = 0; /* bit offset for logarithmic object size bits */
|
|
jbe@0
|
1177 int k = 0; /* bit offset for latitude and longitude */
|
|
jbe@0
|
1178 /* fetch logarithmic object size information */
|
|
jbe@0
|
1179 int objsize1 = PGL_KEY_OBJSIZE(dst);
|
|
jbe@0
|
1180 int objsize2 = PGL_KEY_OBJSIZE(src);
|
|
jbe@0
|
1181 /* handle special cases for empty objects (universal and empty keys) */
|
|
jbe@0
|
1182 if (
|
|
jbe@0
|
1183 objsize1 > PGL_AREAKEY_MAXOBJSIZE ||
|
|
jbe@0
|
1184 objsize2 > PGL_AREAKEY_MAXOBJSIZE
|
|
jbe@0
|
1185 ) {
|
|
jbe@0
|
1186 if (
|
|
jbe@0
|
1187 objsize1 == PGL_KEY_OBJSIZE_EMPTY &&
|
|
jbe@0
|
1188 objsize2 == PGL_KEY_OBJSIZE_EMPTY
|
|
jbe@0
|
1189 ) pgl_key_set_empty(dst);
|
|
jbe@0
|
1190 else pgl_key_set_universal(dst);
|
|
jbe@0
|
1191 return;
|
|
jbe@0
|
1192 }
|
|
jbe@0
|
1193 /* iterate through key bits */
|
|
jbe@0
|
1194 for (i=0; i<depth; i++) {
|
|
jbe@0
|
1195 /* every second bit is a bit describing the object size */
|
|
jbe@0
|
1196 if (i%2 == 0) {
|
|
jbe@0
|
1197 /* increase bit counter for object size bits first */
|
|
jbe@0
|
1198 /* (handy when setting objsize variable) */
|
|
jbe@0
|
1199 j++;
|
|
jbe@0
|
1200 /* check if object size bit is set in neither key */
|
|
jbe@0
|
1201 if (objsize1 >= j && objsize2 >= j) {
|
|
jbe@0
|
1202 /* set objsize in destination buffer to indicate that size bit is
|
|
jbe@0
|
1203 unset in destination buffer at the current bit position */
|
|
jbe@0
|
1204 dstbuf[PGL_KEY_OBJSIZE_OFFSET] = j;
|
|
jbe@0
|
1205 }
|
|
jbe@0
|
1206 /* break if object size bit is set in one key only */
|
|
jbe@0
|
1207 else if (objsize1 >= j || objsize2 >= j) break;
|
|
jbe@0
|
1208 }
|
|
jbe@0
|
1209 /* all other bits describe latitude and longitude */
|
|
jbe@0
|
1210 else {
|
|
jbe@0
|
1211 /* break if bit differs in both keys */
|
|
jbe@0
|
1212 if (PGL_KEY_LATLONBIT(dst, k)) {
|
|
jbe@0
|
1213 if (!PGL_KEY_LATLONBIT(src, k)) break;
|
|
jbe@0
|
1214 /* but set bit in destination buffer if bit is set in both keys */
|
|
jbe@0
|
1215 dstbuf[k/8] |= 0x80 >> (k%8);
|
|
jbe@0
|
1216 } else if (PGL_KEY_LATLONBIT(src, k)) break;
|
|
jbe@0
|
1217 /* increase bit counter for latitude/longitude bits */
|
|
jbe@0
|
1218 k++;
|
|
jbe@0
|
1219 }
|
|
jbe@0
|
1220 }
|
|
jbe@0
|
1221 /* set common node depth and type bit (type bit = 1) */
|
|
jbe@0
|
1222 dstbuf[PGL_KEY_NODEDEPTH_OFFSET] = PGL_AREAKEY_TYPEMASK | i;
|
|
jbe@0
|
1223 /* copy contents of destination buffer to first key */
|
|
jbe@0
|
1224 memcpy(dst, dstbuf, sizeof(pgl_areakey));
|
|
jbe@0
|
1225 }
|
|
jbe@0
|
1226 /* if not, keys are point keys */
|
|
jbe@0
|
1227 else {
|
|
jbe@0
|
1228 pgl_pointkey dstbuf = { 0, }; /* destination buffer (cleared) */
|
|
jbe@0
|
1229 /* iterate through key bits */
|
|
jbe@0
|
1230 for (i=0; i<depth; i++) {
|
|
jbe@0
|
1231 /* break if bit differs in both keys */
|
|
jbe@0
|
1232 if (PGL_KEY_LATLONBIT(dst, i)) {
|
|
jbe@0
|
1233 if (!PGL_KEY_LATLONBIT(src, i)) break;
|
|
jbe@0
|
1234 /* but set bit in destination buffer if bit is set in both keys */
|
|
jbe@0
|
1235 dstbuf[i/8] |= 0x80 >> (i%8);
|
|
jbe@0
|
1236 } else if (PGL_KEY_LATLONBIT(src, i)) break;
|
|
jbe@0
|
1237 }
|
|
jbe@0
|
1238 /* set common node depth (type bit = 0) */
|
|
jbe@0
|
1239 dstbuf[PGL_KEY_NODEDEPTH_OFFSET] = i;
|
|
jbe@0
|
1240 /* copy contents of destination buffer to first key */
|
|
jbe@0
|
1241 memcpy(dst, dstbuf, sizeof(pgl_pointkey));
|
|
jbe@0
|
1242 }
|
|
jbe@0
|
1243 }
|
|
jbe@0
|
1244
|
|
jbe@0
|
1245 /* determine center(!) boundaries and radius estimation of index key */
|
|
jbe@0
|
1246 static double pgl_key_to_box(pgl_keyptr key, pgl_box *box) {
|
|
jbe@0
|
1247 int i;
|
|
jbe@0
|
1248 /* determine node depth */
|
|
jbe@0
|
1249 int depth = PGL_KEY_NODEDEPTH(key);
|
|
jbe@0
|
1250 /* center point of possible result */
|
|
jbe@0
|
1251 double lat = 0;
|
|
jbe@0
|
1252 double lon = 0;
|
|
jbe@0
|
1253 /* maximum distance of real center point from key center */
|
|
jbe@0
|
1254 double dlat = 90;
|
|
jbe@0
|
1255 double dlon = 180;
|
|
jbe@0
|
1256 /* maximum radius of contained objects */
|
|
jbe@0
|
1257 double radius = 0; /* always return zero for point index keys */
|
|
jbe@0
|
1258 /* check if key is area key */
|
|
jbe@0
|
1259 if (PGL_KEY_IS_AREAKEY(key)) {
|
|
jbe@0
|
1260 /* get logarithmic object size */
|
|
jbe@0
|
1261 int objsize = PGL_KEY_OBJSIZE(key);
|
|
jbe@0
|
1262 /* handle special cases for empty objects (universal and empty keys) */
|
|
jbe@0
|
1263 if (objsize == PGL_KEY_OBJSIZE_EMPTY) {
|
|
jbe@0
|
1264 pgl_box_set_empty(box);
|
|
jbe@0
|
1265 return 0;
|
|
jbe@0
|
1266 } else if (objsize == PGL_KEY_OBJSIZE_UNIVERSAL) {
|
|
jbe@0
|
1267 box->lat_min = -90;
|
|
jbe@0
|
1268 box->lat_max = 90;
|
|
jbe@0
|
1269 box->lon_min = -180;
|
|
jbe@0
|
1270 box->lon_max = 180;
|
|
jbe@0
|
1271 return 0; /* any value >= 0 would do */
|
|
jbe@0
|
1272 }
|
|
jbe@0
|
1273 /* calculate maximum possible radius of objects covered by the given key */
|
|
jbe@0
|
1274 if (objsize == 0) radius = INFINITY;
|
|
jbe@0
|
1275 else {
|
|
jbe@0
|
1276 radius = PGL_AREAKEY_REFOBJSIZE;
|
|
jbe@0
|
1277 while (--objsize) radius /= M_SQRT2;
|
|
jbe@0
|
1278 }
|
|
jbe@0
|
1279 /* iterate over latitude and longitude bits in key */
|
|
jbe@0
|
1280 /* (every second bit is a latitude or longitude bit) */
|
|
jbe@0
|
1281 for (i=0; i<depth/2; i++) {
|
|
jbe@0
|
1282 /* check if latitude bit */
|
|
jbe@0
|
1283 if (i%2 == 0) {
|
|
jbe@0
|
1284 /* cut latitude dimension in half */
|
|
jbe@0
|
1285 dlat /= 2;
|
|
jbe@0
|
1286 /* increase center latitude if bit is 1, otherwise decrease */
|
|
jbe@0
|
1287 if (PGL_KEY_LATLONBIT(key, i)) lat += dlat;
|
|
jbe@0
|
1288 else lat -= dlat;
|
|
jbe@0
|
1289 }
|
|
jbe@0
|
1290 /* otherwise longitude bit */
|
|
jbe@0
|
1291 else {
|
|
jbe@0
|
1292 /* cut longitude dimension in half */
|
|
jbe@0
|
1293 dlon /= 2;
|
|
jbe@0
|
1294 /* increase center longitude if bit is 1, otherwise decrease */
|
|
jbe@0
|
1295 if (PGL_KEY_LATLONBIT(key, i)) lon += dlon;
|
|
jbe@0
|
1296 else lon -= dlon;
|
|
jbe@0
|
1297 }
|
|
jbe@0
|
1298 }
|
|
jbe@0
|
1299 }
|
|
jbe@0
|
1300 /* if not, keys are point keys */
|
|
jbe@0
|
1301 else {
|
|
jbe@0
|
1302 /* iterate over all bits in key */
|
|
jbe@0
|
1303 for (i=0; i<depth; i++) {
|
|
jbe@0
|
1304 /* check if latitude bit */
|
|
jbe@0
|
1305 if (i%2 == 0) {
|
|
jbe@0
|
1306 /* cut latitude dimension in half */
|
|
jbe@0
|
1307 dlat /= 2;
|
|
jbe@0
|
1308 /* increase center latitude if bit is 1, otherwise decrease */
|
|
jbe@0
|
1309 if (PGL_KEY_LATLONBIT(key, i)) lat += dlat;
|
|
jbe@0
|
1310 else lat -= dlat;
|
|
jbe@0
|
1311 }
|
|
jbe@0
|
1312 /* otherwise longitude bit */
|
|
jbe@0
|
1313 else {
|
|
jbe@0
|
1314 /* cut longitude dimension in half */
|
|
jbe@0
|
1315 dlon /= 2;
|
|
jbe@0
|
1316 /* increase center longitude if bit is 1, otherwise decrease */
|
|
jbe@0
|
1317 if (PGL_KEY_LATLONBIT(key, i)) lon += dlon;
|
|
jbe@0
|
1318 else lon -= dlon;
|
|
jbe@0
|
1319 }
|
|
jbe@0
|
1320 }
|
|
jbe@0
|
1321 }
|
|
jbe@0
|
1322 /* calculate boundaries from center point and remaining dlat and dlon */
|
|
jbe@0
|
1323 /* (return values through pointer to box) */
|
|
jbe@0
|
1324 box->lat_min = lat - dlat;
|
|
jbe@0
|
1325 box->lat_max = lat + dlat;
|
|
jbe@0
|
1326 box->lon_min = lon - dlon;
|
|
jbe@0
|
1327 box->lon_max = lon + dlon;
|
|
jbe@0
|
1328 /* return radius (as a function return value) */
|
|
jbe@0
|
1329 return radius;
|
|
jbe@0
|
1330 }
|
|
jbe@0
|
1331
|
|
jbe@0
|
1332 /* estimator function for distance between point and index key */
|
|
jbe@16
|
1333 /* always returns a smaller value than actually correct or zero */
|
|
jbe@0
|
1334 static double pgl_estimate_key_distance(pgl_keyptr key, pgl_point *point) {
|
|
jbe@0
|
1335 pgl_box box; /* center(!) bounding box of area index key */
|
|
jbe@0
|
1336 /* calculate center(!) bounding box and maximum radius of objects covered
|
|
jbe@0
|
1337 by area index key (radius is zero for point index keys) */
|
|
jbe@0
|
1338 double distance = pgl_key_to_box(key, &box);
|
|
jbe@0
|
1339 /* calculate estimated distance between bounding box of center point of
|
|
jbe@0
|
1340 indexed object and point passed as second argument, then substract maximum
|
|
jbe@0
|
1341 radius of objects covered by index key */
|
|
jbe@16
|
1342 distance = pgl_estimate_point_box_distance(point, &box) - distance;
|
|
jbe@0
|
1343 /* truncate negative results to zero */
|
|
jbe@0
|
1344 if (distance <= 0) distance = 0;
|
|
jbe@0
|
1345 /* return result */
|
|
jbe@0
|
1346 return distance;
|
|
jbe@0
|
1347 }
|
|
jbe@0
|
1348
|
|
jbe@0
|
1349
|
|
jbe@0
|
1350 /*---------------------------------*
|
|
jbe@0
|
1351 * helper functions for text I/O *
|
|
jbe@0
|
1352 *---------------------------------*/
|
|
jbe@0
|
1353
|
|
jbe@0
|
1354 #define PGL_NUMBUFLEN 64 /* buffer size for number to string conversion */
|
|
jbe@0
|
1355
|
|
jbe@0
|
1356 /* convert floating point number to string (round-trip safe) */
|
|
jbe@0
|
1357 static void pgl_print_float(char *buf, double flt) {
|
|
jbe@0
|
1358 /* check if number is integral */
|
|
jbe@0
|
1359 if (trunc(flt) == flt) {
|
|
jbe@0
|
1360 /* for integral floats use maximum precision */
|
|
jbe@0
|
1361 snprintf(buf, PGL_NUMBUFLEN, "%.17g", flt);
|
|
jbe@0
|
1362 } else {
|
|
jbe@0
|
1363 /* otherwise check if 15, 16, or 17 digits needed (round-trip safety) */
|
|
jbe@0
|
1364 snprintf(buf, PGL_NUMBUFLEN, "%.15g", flt);
|
|
jbe@0
|
1365 if (strtod(buf, NULL) != flt) snprintf(buf, PGL_NUMBUFLEN, "%.16g", flt);
|
|
jbe@0
|
1366 if (strtod(buf, NULL) != flt) snprintf(buf, PGL_NUMBUFLEN, "%.17g", flt);
|
|
jbe@0
|
1367 }
|
|
jbe@0
|
1368 }
|
|
jbe@0
|
1369
|
|
jbe@0
|
1370 /* convert latitude floating point number (in degrees) to string */
|
|
jbe@0
|
1371 static void pgl_print_lat(char *buf, double lat) {
|
|
jbe@0
|
1372 if (signbit(lat)) {
|
|
jbe@0
|
1373 /* treat negative latitudes (including -0) as south */
|
|
jbe@0
|
1374 snprintf(buf, PGL_NUMBUFLEN, "S%015.12f", -lat);
|
|
jbe@0
|
1375 } else {
|
|
jbe@0
|
1376 /* treat positive latitudes (including +0) as north */
|
|
jbe@0
|
1377 snprintf(buf, PGL_NUMBUFLEN, "N%015.12f", lat);
|
|
jbe@0
|
1378 }
|
|
jbe@0
|
1379 }
|
|
jbe@0
|
1380
|
|
jbe@0
|
1381 /* convert longitude floating point number (in degrees) to string */
|
|
jbe@0
|
1382 static void pgl_print_lon(char *buf, double lon) {
|
|
jbe@0
|
1383 if (signbit(lon)) {
|
|
jbe@0
|
1384 /* treat negative longitudes (including -0) as west */
|
|
jbe@0
|
1385 snprintf(buf, PGL_NUMBUFLEN, "W%016.12f", -lon);
|
|
jbe@0
|
1386 } else {
|
|
jbe@0
|
1387 /* treat positive longitudes (including +0) as east */
|
|
jbe@0
|
1388 snprintf(buf, PGL_NUMBUFLEN, "E%016.12f", lon);
|
|
jbe@0
|
1389 }
|
|
jbe@0
|
1390 }
|
|
jbe@0
|
1391
|
|
jbe@0
|
1392 /* bit masks used as return value of pgl_scan() function */
|
|
jbe@0
|
1393 #define PGL_SCAN_NONE 0 /* no value has been parsed */
|
|
jbe@0
|
1394 #define PGL_SCAN_LAT (1<<0) /* latitude has been parsed */
|
|
jbe@0
|
1395 #define PGL_SCAN_LON (1<<1) /* longitude has been parsed */
|
|
jbe@0
|
1396 #define PGL_SCAN_LATLON (PGL_SCAN_LAT | PGL_SCAN_LON) /* bitwise OR of both */
|
|
jbe@0
|
1397
|
|
jbe@0
|
1398 /* parse a coordinate (can be latitude or longitude) */
|
|
jbe@0
|
1399 static int pgl_scan(char **str, double *lat, double *lon) {
|
|
jbe@0
|
1400 double val;
|
|
jbe@0
|
1401 int len;
|
|
jbe@0
|
1402 if (
|
|
jbe@0
|
1403 sscanf(*str, " N %lf %n", &val, &len) ||
|
|
jbe@0
|
1404 sscanf(*str, " n %lf %n", &val, &len)
|
|
jbe@0
|
1405 ) {
|
|
jbe@0
|
1406 *str += len; *lat = val; return PGL_SCAN_LAT;
|
|
jbe@0
|
1407 }
|
|
jbe@0
|
1408 if (
|
|
jbe@0
|
1409 sscanf(*str, " S %lf %n", &val, &len) ||
|
|
jbe@0
|
1410 sscanf(*str, " s %lf %n", &val, &len)
|
|
jbe@0
|
1411 ) {
|
|
jbe@0
|
1412 *str += len; *lat = -val; return PGL_SCAN_LAT;
|
|
jbe@0
|
1413 }
|
|
jbe@0
|
1414 if (
|
|
jbe@0
|
1415 sscanf(*str, " E %lf %n", &val, &len) ||
|
|
jbe@0
|
1416 sscanf(*str, " e %lf %n", &val, &len)
|
|
jbe@0
|
1417 ) {
|
|
jbe@0
|
1418 *str += len; *lon = val; return PGL_SCAN_LON;
|
|
jbe@0
|
1419 }
|
|
jbe@0
|
1420 if (
|
|
jbe@0
|
1421 sscanf(*str, " W %lf %n", &val, &len) ||
|
|
jbe@0
|
1422 sscanf(*str, " w %lf %n", &val, &len)
|
|
jbe@0
|
1423 ) {
|
|
jbe@0
|
1424 *str += len; *lon = -val; return PGL_SCAN_LON;
|
|
jbe@0
|
1425 }
|
|
jbe@0
|
1426 return PGL_SCAN_NONE;
|
|
jbe@0
|
1427 }
|
|
jbe@0
|
1428
|
|
jbe@0
|
1429
|
|
jbe@0
|
1430 /*-----------------*
|
|
jbe@0
|
1431 * SQL functions *
|
|
jbe@0
|
1432 *-----------------*/
|
|
jbe@0
|
1433
|
|
jbe@0
|
1434 /* Note: These function names use "epoint", "ebox", etc. notation here instead
|
|
jbe@0
|
1435 of "point", "box", etc. in order to distinguish them from any previously
|
|
jbe@0
|
1436 defined functions. */
|
|
jbe@0
|
1437
|
|
jbe@0
|
1438 /* function needed for dummy types and/or not implemented features */
|
|
jbe@0
|
1439 PG_FUNCTION_INFO_V1(pgl_notimpl);
|
|
jbe@0
|
1440 Datum pgl_notimpl(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1441 ereport(ERROR, (errmsg("not implemented by pgLatLon")));
|
|
jbe@0
|
1442 }
|
|
jbe@0
|
1443
|
|
jbe@0
|
1444 /* set point to latitude and longitude (including checks) */
|
|
jbe@0
|
1445 static void pgl_epoint_set_latlon(pgl_point *point, double lat, double lon) {
|
|
jbe@0
|
1446 /* reject infinite or NaN values */
|
|
jbe@0
|
1447 if (!isfinite(lat) || !isfinite(lon)) {
|
|
jbe@0
|
1448 ereport(ERROR, (
|
|
jbe@0
|
1449 errcode(ERRCODE_DATA_EXCEPTION),
|
|
jbe@0
|
1450 errmsg("epoint requires finite coordinates")
|
|
jbe@0
|
1451 ));
|
|
jbe@0
|
1452 }
|
|
jbe@0
|
1453 /* check latitude bounds */
|
|
jbe@0
|
1454 if (lat < -90) {
|
|
jbe@0
|
1455 ereport(WARNING, (errmsg("latitude exceeds south pole")));
|
|
jbe@0
|
1456 lat = -90;
|
|
jbe@0
|
1457 } else if (lat > 90) {
|
|
jbe@0
|
1458 ereport(WARNING, (errmsg("latitude exceeds north pole")));
|
|
jbe@0
|
1459 lat = 90;
|
|
jbe@0
|
1460 }
|
|
jbe@0
|
1461 /* check longitude bounds */
|
|
jbe@0
|
1462 if (lon < -180) {
|
|
jbe@0
|
1463 ereport(NOTICE, (errmsg("longitude west of 180th meridian normalized")));
|
|
jbe@0
|
1464 lon += 360 - trunc(lon / 360) * 360;
|
|
jbe@0
|
1465 } else if (lon > 180) {
|
|
jbe@0
|
1466 ereport(NOTICE, (errmsg("longitude east of 180th meridian normalized")));
|
|
jbe@0
|
1467 lon -= 360 + trunc(lon / 360) * 360;
|
|
jbe@0
|
1468 }
|
|
jbe@0
|
1469 /* store rounded latitude/longitude values for round-trip safety */
|
|
jbe@0
|
1470 point->lat = pgl_round(lat);
|
|
jbe@0
|
1471 point->lon = pgl_round(lon);
|
|
jbe@0
|
1472 }
|
|
jbe@0
|
1473
|
|
jbe@0
|
1474 /* create point ("epoint" in SQL) from latitude and longitude */
|
|
jbe@0
|
1475 PG_FUNCTION_INFO_V1(pgl_create_epoint);
|
|
jbe@0
|
1476 Datum pgl_create_epoint(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1477 pgl_point *point = (pgl_point *)palloc(sizeof(pgl_point));
|
|
jbe@0
|
1478 pgl_epoint_set_latlon(point, PG_GETARG_FLOAT8(0), PG_GETARG_FLOAT8(1));
|
|
jbe@0
|
1479 PG_RETURN_POINTER(point);
|
|
jbe@0
|
1480 }
|
|
jbe@0
|
1481
|
|
jbe@0
|
1482 /* parse point ("epoint" in SQL) */
|
|
jbe@0
|
1483 /* format: '[NS]<float> [EW]<float>' */
|
|
jbe@0
|
1484 PG_FUNCTION_INFO_V1(pgl_epoint_in);
|
|
jbe@0
|
1485 Datum pgl_epoint_in(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1486 char *str = PG_GETARG_CSTRING(0); /* input string */
|
|
jbe@0
|
1487 char *strptr = str; /* current position within string */
|
|
jbe@0
|
1488 int done = 0; /* bit mask storing if latitude or longitude was read */
|
|
jbe@0
|
1489 double lat, lon; /* parsed values as double precision floats */
|
|
jbe@0
|
1490 pgl_point *point; /* return value (to be palloc'ed) */
|
|
jbe@0
|
1491 /* parse two floats (each latitude or longitude) separated by white-space */
|
|
jbe@0
|
1492 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1493 if (strptr != str && isspace(strptr[-1])) {
|
|
jbe@0
|
1494 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1495 }
|
|
jbe@0
|
1496 /* require end of string, and latitude and longitude parsed successfully */
|
|
jbe@0
|
1497 if (strptr[0] || done != PGL_SCAN_LATLON) {
|
|
jbe@0
|
1498 ereport(ERROR, (
|
|
jbe@0
|
1499 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1500 errmsg("invalid input syntax for type epoint: \"%s\"", str)
|
|
jbe@0
|
1501 ));
|
|
jbe@0
|
1502 }
|
|
jbe@0
|
1503 /* allocate memory for result */
|
|
jbe@0
|
1504 point = (pgl_point *)palloc(sizeof(pgl_point));
|
|
jbe@0
|
1505 /* set latitude and longitude (and perform checks) */
|
|
jbe@0
|
1506 pgl_epoint_set_latlon(point, lat, lon);
|
|
jbe@0
|
1507 /* return result */
|
|
jbe@0
|
1508 PG_RETURN_POINTER(point);
|
|
jbe@0
|
1509 }
|
|
jbe@0
|
1510
|
|
jbe@0
|
1511 /* create box ("ebox" in SQL) that is empty */
|
|
jbe@0
|
1512 PG_FUNCTION_INFO_V1(pgl_create_empty_ebox);
|
|
jbe@0
|
1513 Datum pgl_create_empty_ebox(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1514 pgl_box *box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
1515 pgl_box_set_empty(box);
|
|
jbe@0
|
1516 PG_RETURN_POINTER(box);
|
|
jbe@0
|
1517 }
|
|
jbe@0
|
1518
|
|
jbe@0
|
1519 /* set box to given boundaries (including checks) */
|
|
jbe@0
|
1520 static void pgl_ebox_set_boundaries(
|
|
jbe@0
|
1521 pgl_box *box,
|
|
jbe@0
|
1522 double lat_min, double lat_max, double lon_min, double lon_max
|
|
jbe@0
|
1523 ) {
|
|
jbe@0
|
1524 /* if minimum latitude is greater than maximum latitude, return empty box */
|
|
jbe@0
|
1525 if (lat_min > lat_max) {
|
|
jbe@0
|
1526 pgl_box_set_empty(box);
|
|
jbe@0
|
1527 return;
|
|
jbe@0
|
1528 }
|
|
jbe@0
|
1529 /* otherwise reject infinite or NaN values */
|
|
jbe@0
|
1530 if (
|
|
jbe@0
|
1531 !isfinite(lat_min) || !isfinite(lat_max) ||
|
|
jbe@0
|
1532 !isfinite(lon_min) || !isfinite(lon_max)
|
|
jbe@0
|
1533 ) {
|
|
jbe@0
|
1534 ereport(ERROR, (
|
|
jbe@0
|
1535 errcode(ERRCODE_DATA_EXCEPTION),
|
|
jbe@0
|
1536 errmsg("ebox requires finite coordinates")
|
|
jbe@0
|
1537 ));
|
|
jbe@0
|
1538 }
|
|
jbe@0
|
1539 /* check latitude bounds */
|
|
jbe@0
|
1540 if (lat_max < -90) {
|
|
jbe@0
|
1541 ereport(WARNING, (errmsg("northern latitude exceeds south pole")));
|
|
jbe@0
|
1542 lat_max = -90;
|
|
jbe@0
|
1543 } else if (lat_max > 90) {
|
|
jbe@0
|
1544 ereport(WARNING, (errmsg("northern latitude exceeds north pole")));
|
|
jbe@0
|
1545 lat_max = 90;
|
|
jbe@0
|
1546 }
|
|
jbe@0
|
1547 if (lat_min < -90) {
|
|
jbe@0
|
1548 ereport(WARNING, (errmsg("southern latitude exceeds south pole")));
|
|
jbe@0
|
1549 lat_min = -90;
|
|
jbe@0
|
1550 } else if (lat_min > 90) {
|
|
jbe@0
|
1551 ereport(WARNING, (errmsg("southern latitude exceeds north pole")));
|
|
jbe@0
|
1552 lat_min = 90;
|
|
jbe@0
|
1553 }
|
|
jbe@0
|
1554 /* check if all longitudes are included */
|
|
jbe@0
|
1555 if (lon_max - lon_min >= 360) {
|
|
jbe@0
|
1556 if (lon_max - lon_min > 360) ereport(WARNING, (
|
|
jbe@0
|
1557 errmsg("longitude coverage greater than 360 degrees")
|
|
jbe@0
|
1558 ));
|
|
jbe@0
|
1559 lon_min = -180;
|
|
jbe@0
|
1560 lon_max = 180;
|
|
jbe@0
|
1561 } else {
|
|
jbe@0
|
1562 /* normalize longitude bounds */
|
|
jbe@0
|
1563 if (lon_min < -180) lon_min += 360 - trunc(lon_min / 360) * 360;
|
|
jbe@0
|
1564 else if (lon_min > 180) lon_min -= 360 + trunc(lon_min / 360) * 360;
|
|
jbe@0
|
1565 if (lon_max < -180) lon_max += 360 - trunc(lon_max / 360) * 360;
|
|
jbe@0
|
1566 else if (lon_max > 180) lon_max -= 360 + trunc(lon_max / 360) * 360;
|
|
jbe@0
|
1567 }
|
|
jbe@0
|
1568 /* store rounded latitude/longitude values for round-trip safety */
|
|
jbe@0
|
1569 box->lat_min = pgl_round(lat_min);
|
|
jbe@0
|
1570 box->lat_max = pgl_round(lat_max);
|
|
jbe@0
|
1571 box->lon_min = pgl_round(lon_min);
|
|
jbe@0
|
1572 box->lon_max = pgl_round(lon_max);
|
|
jbe@0
|
1573 /* ensure that rounding does not change orientation */
|
|
jbe@0
|
1574 if (lon_min > lon_max && box->lon_min == box->lon_max) {
|
|
jbe@0
|
1575 box->lon_min = -180;
|
|
jbe@0
|
1576 box->lon_max = 180;
|
|
jbe@0
|
1577 }
|
|
jbe@0
|
1578 }
|
|
jbe@0
|
1579
|
|
jbe@0
|
1580 /* create box ("ebox" in SQL) from min/max latitude and min/max longitude */
|
|
jbe@0
|
1581 PG_FUNCTION_INFO_V1(pgl_create_ebox);
|
|
jbe@0
|
1582 Datum pgl_create_ebox(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1583 pgl_box *box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
1584 pgl_ebox_set_boundaries(
|
|
jbe@0
|
1585 box,
|
|
jbe@0
|
1586 PG_GETARG_FLOAT8(0), PG_GETARG_FLOAT8(1),
|
|
jbe@0
|
1587 PG_GETARG_FLOAT8(2), PG_GETARG_FLOAT8(3)
|
|
jbe@0
|
1588 );
|
|
jbe@0
|
1589 PG_RETURN_POINTER(box);
|
|
jbe@0
|
1590 }
|
|
jbe@0
|
1591
|
|
jbe@0
|
1592 /* create box ("ebox" in SQL) from two points ("epoint"s) */
|
|
jbe@0
|
1593 /* (can not be used to cover a longitude range of more than 120 degrees) */
|
|
jbe@0
|
1594 PG_FUNCTION_INFO_V1(pgl_create_ebox_from_epoints);
|
|
jbe@0
|
1595 Datum pgl_create_ebox_from_epoints(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1596 pgl_point *point1 = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
1597 pgl_point *point2 = (pgl_point *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
1598 pgl_box *box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
1599 double lat_min, lat_max, lon_min, lon_max;
|
|
jbe@0
|
1600 double dlon; /* longitude range (delta longitude) */
|
|
jbe@0
|
1601 /* order latitude and longitude boundaries */
|
|
jbe@0
|
1602 if (point2->lat < point1->lat) {
|
|
jbe@0
|
1603 lat_min = point2->lat;
|
|
jbe@0
|
1604 lat_max = point1->lat;
|
|
jbe@0
|
1605 } else {
|
|
jbe@0
|
1606 lat_min = point1->lat;
|
|
jbe@0
|
1607 lat_max = point2->lat;
|
|
jbe@0
|
1608 }
|
|
jbe@0
|
1609 if (point2->lon < point1->lon) {
|
|
jbe@0
|
1610 lon_min = point2->lon;
|
|
jbe@0
|
1611 lon_max = point1->lon;
|
|
jbe@0
|
1612 } else {
|
|
jbe@0
|
1613 lon_min = point1->lon;
|
|
jbe@0
|
1614 lon_max = point2->lon;
|
|
jbe@0
|
1615 }
|
|
jbe@0
|
1616 /* calculate longitude range (round to avoid floating point errors) */
|
|
jbe@0
|
1617 dlon = pgl_round(lon_max - lon_min);
|
|
jbe@0
|
1618 /* determine east-west direction */
|
|
jbe@0
|
1619 if (dlon >= 240) {
|
|
jbe@0
|
1620 /* assume that 180th meridian is crossed and swap min/max longitude */
|
|
jbe@0
|
1621 double swap = lon_min; lon_min = lon_max; lon_max = swap;
|
|
jbe@0
|
1622 } else if (dlon > 120) {
|
|
jbe@0
|
1623 /* unclear orientation since delta longitude > 120 */
|
|
jbe@0
|
1624 ereport(ERROR, (
|
|
jbe@0
|
1625 errcode(ERRCODE_DATA_EXCEPTION),
|
|
jbe@0
|
1626 errmsg("can not determine east/west orientation for ebox")
|
|
jbe@0
|
1627 ));
|
|
jbe@0
|
1628 }
|
|
jbe@0
|
1629 /* use boundaries to setup box (and perform checks) */
|
|
jbe@0
|
1630 pgl_ebox_set_boundaries(box, lat_min, lat_max, lon_min, lon_max);
|
|
jbe@0
|
1631 /* return result */
|
|
jbe@0
|
1632 PG_RETURN_POINTER(box);
|
|
jbe@0
|
1633 }
|
|
jbe@0
|
1634
|
|
jbe@0
|
1635 /* parse box ("ebox" in SQL) */
|
|
jbe@0
|
1636 /* format: '[NS]<float> [EW]<float> [NS]<float> [EW]<float>'
|
|
jbe@0
|
1637 or: '[NS]<float> [NS]<float> [EW]<float> [EW]<float>' */
|
|
jbe@0
|
1638 PG_FUNCTION_INFO_V1(pgl_ebox_in);
|
|
jbe@0
|
1639 Datum pgl_ebox_in(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1640 char *str = PG_GETARG_CSTRING(0); /* input string */
|
|
jbe@0
|
1641 char *str_lower; /* lower case version of input string */
|
|
jbe@0
|
1642 char *strptr; /* current position within string */
|
|
jbe@0
|
1643 int valid; /* number of valid chars */
|
|
jbe@0
|
1644 int done; /* specifies if latitude or longitude was read */
|
|
jbe@0
|
1645 double val; /* temporary variable */
|
|
jbe@0
|
1646 int lat_count = 0; /* count of latitude values parsed */
|
|
jbe@0
|
1647 int lon_count = 0; /* count of longitufde values parsed */
|
|
jbe@0
|
1648 double lat_min, lat_max, lon_min, lon_max; /* see pgl_box struct */
|
|
jbe@0
|
1649 pgl_box *box; /* return value (to be palloc'ed) */
|
|
jbe@0
|
1650 /* lowercase input */
|
|
jbe@0
|
1651 str_lower = psprintf("%s", str);
|
|
jbe@0
|
1652 for (strptr=str_lower; *strptr; strptr++) {
|
|
jbe@0
|
1653 if (*strptr >= 'A' && *strptr <= 'Z') *strptr += 'a' - 'A';
|
|
jbe@0
|
1654 }
|
|
jbe@0
|
1655 /* reset reading position to start of (lowercase) string */
|
|
jbe@0
|
1656 strptr = str_lower;
|
|
jbe@0
|
1657 /* check if empty box */
|
|
jbe@0
|
1658 valid = 0;
|
|
jbe@0
|
1659 sscanf(strptr, " empty %n", &valid);
|
|
jbe@0
|
1660 if (valid && strptr[valid] == 0) {
|
|
jbe@0
|
1661 /* allocate and return empty box */
|
|
jbe@0
|
1662 box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
1663 pgl_box_set_empty(box);
|
|
jbe@0
|
1664 PG_RETURN_POINTER(box);
|
|
jbe@0
|
1665 }
|
|
jbe@0
|
1666 /* demand four blocks separated by whitespace */
|
|
jbe@0
|
1667 valid = 0;
|
|
jbe@0
|
1668 sscanf(strptr, " %*s %*s %*s %*s %n", &valid);
|
|
jbe@0
|
1669 /* if four blocks separated by whitespace exist, parse those blocks */
|
|
jbe@0
|
1670 if (strptr[valid] == 0) while (strptr[0]) {
|
|
jbe@0
|
1671 /* parse either latitude or longitude (whichever found in input string) */
|
|
jbe@0
|
1672 done = pgl_scan(&strptr, &val, &val);
|
|
jbe@0
|
1673 /* store latitude or longitude in lat_min, lat_max, lon_min, or lon_max */
|
|
jbe@0
|
1674 if (done == PGL_SCAN_LAT) {
|
|
jbe@0
|
1675 if (!lat_count) lat_min = val; else lat_max = val;
|
|
jbe@0
|
1676 lat_count++;
|
|
jbe@0
|
1677 } else if (done == PGL_SCAN_LON) {
|
|
jbe@0
|
1678 if (!lon_count) lon_min = val; else lon_max = val;
|
|
jbe@0
|
1679 lon_count++;
|
|
jbe@0
|
1680 } else {
|
|
jbe@0
|
1681 break;
|
|
jbe@0
|
1682 }
|
|
jbe@0
|
1683 }
|
|
jbe@0
|
1684 /* require end of string, and two latitude and two longitude values */
|
|
jbe@0
|
1685 if (strptr[0] || lat_count != 2 || lon_count != 2) {
|
|
jbe@0
|
1686 ereport(ERROR, (
|
|
jbe@0
|
1687 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1688 errmsg("invalid input syntax for type ebox: \"%s\"", str)
|
|
jbe@0
|
1689 ));
|
|
jbe@0
|
1690 }
|
|
jbe@0
|
1691 /* free lower case string */
|
|
jbe@0
|
1692 pfree(str_lower);
|
|
jbe@0
|
1693 /* order boundaries (maximum greater than minimum) */
|
|
jbe@0
|
1694 if (lat_min > lat_max) { val = lat_min; lat_min = lat_max; lat_max = val; }
|
|
jbe@0
|
1695 if (lon_min > lon_max) { val = lon_min; lon_min = lon_max; lon_max = val; }
|
|
jbe@0
|
1696 /* allocate memory for result */
|
|
jbe@0
|
1697 box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
1698 /* set boundaries (and perform checks) */
|
|
jbe@0
|
1699 pgl_ebox_set_boundaries(box, lat_min, lat_max, lon_min, lon_max);
|
|
jbe@0
|
1700 /* return result */
|
|
jbe@0
|
1701 PG_RETURN_POINTER(box);
|
|
jbe@0
|
1702 }
|
|
jbe@0
|
1703
|
|
jbe@0
|
1704 /* set circle to given latitude, longitude, and radius (including checks) */
|
|
jbe@0
|
1705 static void pgl_ecircle_set_latlon_radius(
|
|
jbe@0
|
1706 pgl_circle *circle, double lat, double lon, double radius
|
|
jbe@0
|
1707 ) {
|
|
jbe@0
|
1708 /* set center point (including checks) */
|
|
jbe@0
|
1709 pgl_epoint_set_latlon(&(circle->center), lat, lon);
|
|
jbe@0
|
1710 /* handle non-positive radius */
|
|
jbe@0
|
1711 if (isnan(radius)) {
|
|
jbe@0
|
1712 ereport(ERROR, (
|
|
jbe@0
|
1713 errcode(ERRCODE_DATA_EXCEPTION),
|
|
jbe@0
|
1714 errmsg("invalid radius for ecircle")
|
|
jbe@0
|
1715 ));
|
|
jbe@0
|
1716 }
|
|
jbe@0
|
1717 if (radius == 0) radius = 0; /* avoids -0 */
|
|
jbe@0
|
1718 else if (radius < 0) {
|
|
jbe@0
|
1719 if (isfinite(radius)) {
|
|
jbe@0
|
1720 ereport(NOTICE, (errmsg("negative radius converted to minus infinity")));
|
|
jbe@0
|
1721 }
|
|
jbe@0
|
1722 radius = -INFINITY;
|
|
jbe@0
|
1723 }
|
|
jbe@0
|
1724 /* store radius (round-trip safety is ensured by pgl_print_float) */
|
|
jbe@0
|
1725 circle->radius = radius;
|
|
jbe@0
|
1726 }
|
|
jbe@0
|
1727
|
|
jbe@0
|
1728 /* create circle ("ecircle" in SQL) from latitude, longitude, and radius */
|
|
jbe@0
|
1729 PG_FUNCTION_INFO_V1(pgl_create_ecircle);
|
|
jbe@0
|
1730 Datum pgl_create_ecircle(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1731 pgl_circle *circle = (pgl_circle *)palloc(sizeof(pgl_circle));
|
|
jbe@0
|
1732 pgl_ecircle_set_latlon_radius(
|
|
jbe@0
|
1733 circle, PG_GETARG_FLOAT8(0), PG_GETARG_FLOAT8(1), PG_GETARG_FLOAT8(2)
|
|
jbe@0
|
1734 );
|
|
jbe@0
|
1735 PG_RETURN_POINTER(circle);
|
|
jbe@0
|
1736 }
|
|
jbe@0
|
1737
|
|
jbe@0
|
1738 /* create circle ("ecircle" in SQL) from point ("epoint"), and radius */
|
|
jbe@0
|
1739 PG_FUNCTION_INFO_V1(pgl_create_ecircle_from_epoint);
|
|
jbe@0
|
1740 Datum pgl_create_ecircle_from_epoint(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1741 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
1742 double radius = PG_GETARG_FLOAT8(1);
|
|
jbe@0
|
1743 pgl_circle *circle = (pgl_circle *)palloc(sizeof(pgl_circle));
|
|
jbe@0
|
1744 /* set latitude, longitude, radius (and perform checks) */
|
|
jbe@0
|
1745 pgl_ecircle_set_latlon_radius(circle, point->lat, point->lon, radius);
|
|
jbe@0
|
1746 /* return result */
|
|
jbe@0
|
1747 PG_RETURN_POINTER(circle);
|
|
jbe@0
|
1748 }
|
|
jbe@0
|
1749
|
|
jbe@0
|
1750 /* parse circle ("ecircle" in SQL) */
|
|
jbe@0
|
1751 /* format: '[NS]<float> [EW]<float> <float>' */
|
|
jbe@0
|
1752 PG_FUNCTION_INFO_V1(pgl_ecircle_in);
|
|
jbe@0
|
1753 Datum pgl_ecircle_in(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1754 char *str = PG_GETARG_CSTRING(0); /* input string */
|
|
jbe@0
|
1755 char *strptr = str; /* current position within string */
|
|
jbe@0
|
1756 double lat, lon, radius; /* parsed values as double precision flaots */
|
|
jbe@0
|
1757 int valid = 0; /* number of valid chars */
|
|
jbe@0
|
1758 int done = 0; /* stores if latitude and/or longitude was read */
|
|
jbe@0
|
1759 pgl_circle *circle; /* return value (to be palloc'ed) */
|
|
jbe@0
|
1760 /* demand three blocks separated by whitespace */
|
|
jbe@0
|
1761 sscanf(strptr, " %*s %*s %*s %n", &valid);
|
|
jbe@0
|
1762 /* if three blocks separated by whitespace exist, parse those blocks */
|
|
jbe@0
|
1763 if (strptr[valid] == 0) {
|
|
jbe@0
|
1764 /* parse latitude and longitude */
|
|
jbe@0
|
1765 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1766 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1767 /* parse radius (while incrementing strptr by number of bytes parsed) */
|
|
jbe@0
|
1768 valid = 0;
|
|
jbe@0
|
1769 if (sscanf(strptr, " %lf %n", &radius, &valid) == 1) strptr += valid;
|
|
jbe@0
|
1770 }
|
|
jbe@0
|
1771 /* require end of string and both latitude and longitude being parsed */
|
|
jbe@0
|
1772 if (strptr[0] || done != PGL_SCAN_LATLON) {
|
|
jbe@0
|
1773 ereport(ERROR, (
|
|
jbe@0
|
1774 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1775 errmsg("invalid input syntax for type ecircle: \"%s\"", str)
|
|
jbe@0
|
1776 ));
|
|
jbe@0
|
1777 }
|
|
jbe@0
|
1778 /* allocate memory for result */
|
|
jbe@0
|
1779 circle = (pgl_circle *)palloc(sizeof(pgl_circle));
|
|
jbe@0
|
1780 /* set latitude, longitude, radius (and perform checks) */
|
|
jbe@0
|
1781 pgl_ecircle_set_latlon_radius(circle, lat, lon, radius);
|
|
jbe@0
|
1782 /* return result */
|
|
jbe@0
|
1783 PG_RETURN_POINTER(circle);
|
|
jbe@0
|
1784 }
|
|
jbe@0
|
1785
|
|
jbe@0
|
1786 /* parse cluster ("ecluster" in SQL) */
|
|
jbe@0
|
1787 PG_FUNCTION_INFO_V1(pgl_ecluster_in);
|
|
jbe@0
|
1788 Datum pgl_ecluster_in(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1789 int i;
|
|
jbe@0
|
1790 char *str = PG_GETARG_CSTRING(0); /* input string */
|
|
jbe@0
|
1791 char *str_lower; /* lower case version of input string */
|
|
jbe@0
|
1792 char *strptr; /* pointer to current reading position of input */
|
|
jbe@0
|
1793 int npoints_total = 0; /* total number of points in cluster */
|
|
jbe@0
|
1794 int nentries = 0; /* total number of entries */
|
|
jbe@0
|
1795 pgl_newentry *entries; /* array of pgl_newentry to create pgl_cluster */
|
|
jbe@0
|
1796 int entries_buflen = 4; /* maximum number of elements in entries array */
|
|
jbe@0
|
1797 int valid; /* number of valid chars processed */
|
|
jbe@0
|
1798 double lat, lon; /* latitude and longitude of parsed point */
|
|
jbe@0
|
1799 int entrytype; /* current entry type */
|
|
jbe@0
|
1800 int npoints; /* number of points in current entry */
|
|
jbe@0
|
1801 pgl_point *points; /* array of pgl_point for pgl_newentry */
|
|
jbe@0
|
1802 int points_buflen; /* maximum number of elements in points array */
|
|
jbe@0
|
1803 int done; /* return value of pgl_scan function */
|
|
jbe@0
|
1804 pgl_cluster *cluster; /* created cluster */
|
|
jbe@0
|
1805 /* lowercase input */
|
|
jbe@0
|
1806 str_lower = psprintf("%s", str);
|
|
jbe@0
|
1807 for (strptr=str_lower; *strptr; strptr++) {
|
|
jbe@0
|
1808 if (*strptr >= 'A' && *strptr <= 'Z') *strptr += 'a' - 'A';
|
|
jbe@0
|
1809 }
|
|
jbe@0
|
1810 /* reset reading position to start of (lowercase) string */
|
|
jbe@0
|
1811 strptr = str_lower;
|
|
jbe@0
|
1812 /* allocate initial buffer for entries */
|
|
jbe@0
|
1813 entries = palloc(entries_buflen * sizeof(pgl_newentry));
|
|
jbe@0
|
1814 /* parse until end of string */
|
|
jbe@0
|
1815 while (strptr[0]) {
|
|
jbe@0
|
1816 /* require previous white-space or closing parenthesis before next token */
|
|
jbe@0
|
1817 if (strptr != str_lower && !isspace(strptr[-1]) && strptr[-1] != ')') {
|
|
jbe@0
|
1818 goto pgl_ecluster_in_error;
|
|
jbe@0
|
1819 }
|
|
jbe@0
|
1820 /* ignore token "empty" */
|
|
jbe@0
|
1821 valid = 0; sscanf(strptr, " empty %n", &valid);
|
|
jbe@0
|
1822 if (valid) { strptr += valid; continue; }
|
|
jbe@0
|
1823 /* test for "point" token */
|
|
jbe@0
|
1824 valid = 0; sscanf(strptr, " point ( %n", &valid);
|
|
jbe@0
|
1825 if (valid) {
|
|
jbe@0
|
1826 strptr += valid;
|
|
jbe@0
|
1827 entrytype = PGL_ENTRY_POINT;
|
|
jbe@0
|
1828 goto pgl_ecluster_in_type_ok;
|
|
jbe@0
|
1829 }
|
|
jbe@0
|
1830 /* test for "path" token */
|
|
jbe@0
|
1831 valid = 0; sscanf(strptr, " path ( %n", &valid);
|
|
jbe@0
|
1832 if (valid) {
|
|
jbe@0
|
1833 strptr += valid;
|
|
jbe@0
|
1834 entrytype = PGL_ENTRY_PATH;
|
|
jbe@0
|
1835 goto pgl_ecluster_in_type_ok;
|
|
jbe@0
|
1836 }
|
|
jbe@0
|
1837 /* test for "outline" token */
|
|
jbe@0
|
1838 valid = 0; sscanf(strptr, " outline ( %n", &valid);
|
|
jbe@0
|
1839 if (valid) {
|
|
jbe@0
|
1840 strptr += valid;
|
|
jbe@0
|
1841 entrytype = PGL_ENTRY_OUTLINE;
|
|
jbe@0
|
1842 goto pgl_ecluster_in_type_ok;
|
|
jbe@0
|
1843 }
|
|
jbe@0
|
1844 /* test for "polygon" token */
|
|
jbe@0
|
1845 valid = 0; sscanf(strptr, " polygon ( %n", &valid);
|
|
jbe@0
|
1846 if (valid) {
|
|
jbe@0
|
1847 strptr += valid;
|
|
jbe@0
|
1848 entrytype = PGL_ENTRY_POLYGON;
|
|
jbe@0
|
1849 goto pgl_ecluster_in_type_ok;
|
|
jbe@0
|
1850 }
|
|
jbe@0
|
1851 /* error if no valid token found */
|
|
jbe@0
|
1852 goto pgl_ecluster_in_error;
|
|
jbe@0
|
1853 pgl_ecluster_in_type_ok:
|
|
jbe@0
|
1854 /* check if pgl_newentry array needs to grow */
|
|
jbe@0
|
1855 if (nentries == entries_buflen) {
|
|
jbe@0
|
1856 pgl_newentry *newbuf;
|
|
jbe@0
|
1857 entries_buflen *= 2;
|
|
jbe@0
|
1858 newbuf = palloc(entries_buflen * sizeof(pgl_newentry));
|
|
jbe@0
|
1859 memcpy(newbuf, entries, nentries * sizeof(pgl_newentry));
|
|
jbe@0
|
1860 pfree(entries);
|
|
jbe@0
|
1861 entries = newbuf;
|
|
jbe@0
|
1862 }
|
|
jbe@0
|
1863 /* reset number of points for current entry */
|
|
jbe@0
|
1864 npoints = 0;
|
|
jbe@0
|
1865 /* allocate array for points */
|
|
jbe@0
|
1866 points_buflen = 4;
|
|
jbe@0
|
1867 points = palloc(points_buflen * sizeof(pgl_point));
|
|
jbe@0
|
1868 /* parse until closing parenthesis */
|
|
jbe@0
|
1869 while (strptr[0] != ')') {
|
|
jbe@0
|
1870 /* error on unexpected end of string */
|
|
jbe@0
|
1871 if (strptr[0] == 0) goto pgl_ecluster_in_error;
|
|
jbe@0
|
1872 /* mark neither latitude nor longitude as read */
|
|
jbe@0
|
1873 done = PGL_SCAN_NONE;
|
|
jbe@0
|
1874 /* require white-space before second, third, etc. point */
|
|
jbe@0
|
1875 if (npoints != 0 && !isspace(strptr[-1])) goto pgl_ecluster_in_error;
|
|
jbe@0
|
1876 /* scan latitude (or longitude) */
|
|
jbe@0
|
1877 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1878 /* require white-space before second coordinate */
|
|
jbe@0
|
1879 if (strptr != str && !isspace(strptr[-1])) goto pgl_ecluster_in_error;
|
|
jbe@0
|
1880 /* scan longitude (or latitude) */
|
|
jbe@0
|
1881 done |= pgl_scan(&strptr, &lat, &lon);
|
|
jbe@0
|
1882 /* error unless both latitude and longitude were parsed */
|
|
jbe@0
|
1883 if (done != PGL_SCAN_LATLON) goto pgl_ecluster_in_error;
|
|
jbe@0
|
1884 /* throw error if number of points is too high */
|
|
jbe@0
|
1885 if (npoints_total == PGL_CLUSTER_MAXPOINTS) {
|
|
jbe@0
|
1886 ereport(ERROR, (
|
|
jbe@0
|
1887 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1888 errmsg(
|
|
jbe@0
|
1889 "too many points for ecluster entry (maximum %i)",
|
|
jbe@0
|
1890 PGL_CLUSTER_MAXPOINTS
|
|
jbe@0
|
1891 )
|
|
jbe@0
|
1892 ));
|
|
jbe@0
|
1893 }
|
|
jbe@0
|
1894 /* check if pgl_point array needs to grow */
|
|
jbe@0
|
1895 if (npoints == points_buflen) {
|
|
jbe@0
|
1896 pgl_point *newbuf;
|
|
jbe@0
|
1897 points_buflen *= 2;
|
|
jbe@0
|
1898 newbuf = palloc(points_buflen * sizeof(pgl_point));
|
|
jbe@0
|
1899 memcpy(newbuf, points, npoints * sizeof(pgl_point));
|
|
jbe@0
|
1900 pfree(points);
|
|
jbe@0
|
1901 points = newbuf;
|
|
jbe@0
|
1902 }
|
|
jbe@0
|
1903 /* append point to pgl_point array (includes checks) */
|
|
jbe@0
|
1904 pgl_epoint_set_latlon(&(points[npoints++]), lat, lon);
|
|
jbe@0
|
1905 /* increase total number of points */
|
|
jbe@0
|
1906 npoints_total++;
|
|
jbe@0
|
1907 }
|
|
jbe@0
|
1908 /* error if entry has no points */
|
|
jbe@0
|
1909 if (!npoints) goto pgl_ecluster_in_error;
|
|
jbe@0
|
1910 /* entries with one point are automatically of type "point" */
|
|
jbe@0
|
1911 if (npoints == 1) entrytype = PGL_ENTRY_POINT;
|
|
jbe@0
|
1912 /* if entries have more than one point */
|
|
jbe@0
|
1913 else {
|
|
jbe@0
|
1914 /* throw error if entry type is "point" */
|
|
jbe@0
|
1915 if (entrytype == PGL_ENTRY_POINT) {
|
|
jbe@0
|
1916 ereport(ERROR, (
|
|
jbe@0
|
1917 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1918 errmsg("invalid input syntax for type ecluster (point entry with more than one point)")
|
|
jbe@0
|
1919 ));
|
|
jbe@0
|
1920 }
|
|
jbe@0
|
1921 /* coerce outlines and polygons with more than 2 points to be a path */
|
|
jbe@0
|
1922 if (npoints == 2) entrytype = PGL_ENTRY_PATH;
|
|
jbe@0
|
1923 }
|
|
jbe@0
|
1924 /* append entry to pgl_newentry array */
|
|
jbe@0
|
1925 entries[nentries].entrytype = entrytype;
|
|
jbe@0
|
1926 entries[nentries].npoints = npoints;
|
|
jbe@0
|
1927 entries[nentries].points = points;
|
|
jbe@0
|
1928 nentries++;
|
|
jbe@0
|
1929 /* consume closing parenthesis */
|
|
jbe@0
|
1930 strptr++;
|
|
jbe@0
|
1931 /* consume white-space */
|
|
jbe@0
|
1932 while (isspace(strptr[0])) strptr++;
|
|
jbe@0
|
1933 }
|
|
jbe@0
|
1934 /* free lower case string */
|
|
jbe@0
|
1935 pfree(str_lower);
|
|
jbe@0
|
1936 /* create cluster from pgl_newentry array */
|
|
jbe@0
|
1937 cluster = pgl_new_cluster(nentries, entries);
|
|
jbe@0
|
1938 /* free pgl_newentry array */
|
|
jbe@0
|
1939 for (i=0; i<nentries; i++) pfree(entries[i].points);
|
|
jbe@0
|
1940 pfree(entries);
|
|
jbe@0
|
1941 /* set bounding circle of cluster and check east/west orientation */
|
|
jbe@0
|
1942 if (!pgl_finalize_cluster(cluster)) {
|
|
jbe@0
|
1943 ereport(ERROR, (
|
|
jbe@0
|
1944 errcode(ERRCODE_DATA_EXCEPTION),
|
|
jbe@0
|
1945 errmsg("can not determine east/west orientation for ecluster"),
|
|
jbe@0
|
1946 errhint("Ensure that each entry has a longitude span of less than 180 degrees.")
|
|
jbe@0
|
1947 ));
|
|
jbe@0
|
1948 }
|
|
jbe@0
|
1949 /* return cluster */
|
|
jbe@0
|
1950 PG_RETURN_POINTER(cluster);
|
|
jbe@0
|
1951 /* code to throw error */
|
|
jbe@0
|
1952 pgl_ecluster_in_error:
|
|
jbe@0
|
1953 ereport(ERROR, (
|
|
jbe@0
|
1954 errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
|
|
jbe@0
|
1955 errmsg("invalid input syntax for type ecluster: \"%s\"", str)
|
|
jbe@0
|
1956 ));
|
|
jbe@0
|
1957 }
|
|
jbe@0
|
1958
|
|
jbe@0
|
1959 /* convert point ("epoint") to string representation */
|
|
jbe@0
|
1960 PG_FUNCTION_INFO_V1(pgl_epoint_out);
|
|
jbe@0
|
1961 Datum pgl_epoint_out(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1962 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
1963 char latstr[PGL_NUMBUFLEN];
|
|
jbe@0
|
1964 char lonstr[PGL_NUMBUFLEN];
|
|
jbe@0
|
1965 pgl_print_lat(latstr, point->lat);
|
|
jbe@0
|
1966 pgl_print_lon(lonstr, point->lon);
|
|
jbe@0
|
1967 PG_RETURN_CSTRING(psprintf("%s %s", latstr, lonstr));
|
|
jbe@0
|
1968 }
|
|
jbe@0
|
1969
|
|
jbe@0
|
1970 /* convert box ("ebox") to string representation */
|
|
jbe@0
|
1971 PG_FUNCTION_INFO_V1(pgl_ebox_out);
|
|
jbe@0
|
1972 Datum pgl_ebox_out(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
1973 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
1974 double lon_min = box->lon_min;
|
|
jbe@0
|
1975 double lon_max = box->lon_max;
|
|
jbe@0
|
1976 char lat_min_str[PGL_NUMBUFLEN];
|
|
jbe@0
|
1977 char lat_max_str[PGL_NUMBUFLEN];
|
|
jbe@0
|
1978 char lon_min_str[PGL_NUMBUFLEN];
|
|
jbe@0
|
1979 char lon_max_str[PGL_NUMBUFLEN];
|
|
jbe@0
|
1980 /* return string "empty" if box is set to be empty */
|
|
jbe@0
|
1981 if (box->lat_min > box->lat_max) PG_RETURN_CSTRING("empty");
|
|
jbe@0
|
1982 /* use boundaries exceeding W180 or E180 if 180th meridian is enclosed */
|
|
jbe@0
|
1983 /* (required since pgl_box_in orders the longitude boundaries) */
|
|
jbe@0
|
1984 if (lon_min > lon_max) {
|
|
jbe@0
|
1985 if (lon_min + lon_max >= 0) lon_min -= 360;
|
|
jbe@0
|
1986 else lon_max += 360;
|
|
jbe@0
|
1987 }
|
|
jbe@0
|
1988 /* format and return result */
|
|
jbe@0
|
1989 pgl_print_lat(lat_min_str, box->lat_min);
|
|
jbe@0
|
1990 pgl_print_lat(lat_max_str, box->lat_max);
|
|
jbe@0
|
1991 pgl_print_lon(lon_min_str, lon_min);
|
|
jbe@0
|
1992 pgl_print_lon(lon_max_str, lon_max);
|
|
jbe@0
|
1993 PG_RETURN_CSTRING(psprintf(
|
|
jbe@0
|
1994 "%s %s %s %s",
|
|
jbe@0
|
1995 lat_min_str, lon_min_str, lat_max_str, lon_max_str
|
|
jbe@0
|
1996 ));
|
|
jbe@0
|
1997 }
|
|
jbe@0
|
1998
|
|
jbe@0
|
1999 /* convert circle ("ecircle") to string representation */
|
|
jbe@0
|
2000 PG_FUNCTION_INFO_V1(pgl_ecircle_out);
|
|
jbe@0
|
2001 Datum pgl_ecircle_out(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2002 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2003 char latstr[PGL_NUMBUFLEN];
|
|
jbe@0
|
2004 char lonstr[PGL_NUMBUFLEN];
|
|
jbe@0
|
2005 char radstr[PGL_NUMBUFLEN];
|
|
jbe@0
|
2006 pgl_print_lat(latstr, circle->center.lat);
|
|
jbe@0
|
2007 pgl_print_lon(lonstr, circle->center.lon);
|
|
jbe@0
|
2008 pgl_print_float(radstr, circle->radius);
|
|
jbe@0
|
2009 PG_RETURN_CSTRING(psprintf("%s %s %s", latstr, lonstr, radstr));
|
|
jbe@0
|
2010 }
|
|
jbe@0
|
2011
|
|
jbe@0
|
2012 /* convert cluster ("ecluster") to string representation */
|
|
jbe@0
|
2013 PG_FUNCTION_INFO_V1(pgl_ecluster_out);
|
|
jbe@0
|
2014 Datum pgl_ecluster_out(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2015 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
|
|
jbe@0
|
2016 char latstr[PGL_NUMBUFLEN]; /* string buffer for latitude */
|
|
jbe@0
|
2017 char lonstr[PGL_NUMBUFLEN]; /* string buffer for longitude */
|
|
jbe@0
|
2018 char ***strings; /* array of array of strings */
|
|
jbe@0
|
2019 char *string; /* string of current token */
|
|
jbe@0
|
2020 char *res, *resptr; /* result and pointer to current write position */
|
|
jbe@0
|
2021 size_t reslen = 1; /* length of result (init with 1 for terminator) */
|
|
jbe@0
|
2022 int npoints; /* number of points of current entry */
|
|
jbe@0
|
2023 int i, j; /* i: entry, j: point in entry */
|
|
jbe@0
|
2024 /* handle empty clusters */
|
|
jbe@0
|
2025 if (cluster->nentries == 0) {
|
|
jbe@0
|
2026 /* free detoasted cluster (if copy) */
|
|
jbe@0
|
2027 PG_FREE_IF_COPY(cluster, 0);
|
|
jbe@0
|
2028 /* return static result */
|
|
jbe@0
|
2029 PG_RETURN_CSTRING("empty");
|
|
jbe@0
|
2030 }
|
|
jbe@0
|
2031 /* allocate array of array of strings */
|
|
jbe@0
|
2032 strings = palloc(cluster->nentries * sizeof(char **));
|
|
jbe@0
|
2033 /* iterate over all entries in cluster */
|
|
jbe@0
|
2034 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
2035 /* get number of points in entry */
|
|
jbe@0
|
2036 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
2037 /* allocate array of strings (one string for each point plus two extra) */
|
|
jbe@0
|
2038 strings[i] = palloc((2 + npoints) * sizeof(char *));
|
|
jbe@0
|
2039 /* determine opening string */
|
|
jbe@0
|
2040 switch (cluster->entries[i].entrytype) {
|
|
jbe@0
|
2041 case PGL_ENTRY_POINT: string = (i==0)?"point (" :" point ("; break;
|
|
jbe@0
|
2042 case PGL_ENTRY_PATH: string = (i==0)?"path (" :" path ("; break;
|
|
jbe@0
|
2043 case PGL_ENTRY_OUTLINE: string = (i==0)?"outline (":" outline ("; break;
|
|
jbe@0
|
2044 case PGL_ENTRY_POLYGON: string = (i==0)?"polygon (":" polygon ("; break;
|
|
jbe@0
|
2045 default: string = (i==0)?"unknown" :" unknown";
|
|
jbe@0
|
2046 }
|
|
jbe@0
|
2047 /* use opening string as first string in array */
|
|
jbe@0
|
2048 strings[i][0] = string;
|
|
jbe@0
|
2049 /* update result length (for allocating result string later) */
|
|
jbe@0
|
2050 reslen += strlen(string);
|
|
jbe@0
|
2051 /* iterate over all points */
|
|
jbe@0
|
2052 for (j=0; j<npoints; j++) {
|
|
jbe@0
|
2053 /* create string representation of point */
|
|
jbe@0
|
2054 pgl_print_lat(latstr, PGL_ENTRY_POINTS(cluster, i)[j].lat);
|
|
jbe@0
|
2055 pgl_print_lon(lonstr, PGL_ENTRY_POINTS(cluster, i)[j].lon);
|
|
jbe@0
|
2056 string = psprintf((j == 0) ? "%s %s" : " %s %s", latstr, lonstr);
|
|
jbe@0
|
2057 /* copy string pointer to string array */
|
|
jbe@0
|
2058 strings[i][j+1] = string;
|
|
jbe@0
|
2059 /* update result length (for allocating result string later) */
|
|
jbe@0
|
2060 reslen += strlen(string);
|
|
jbe@0
|
2061 }
|
|
jbe@0
|
2062 /* use closing parenthesis as last string in array */
|
|
jbe@0
|
2063 strings[i][npoints+1] = ")";
|
|
jbe@0
|
2064 /* update result length (for allocating result string later) */
|
|
jbe@0
|
2065 reslen++;
|
|
jbe@0
|
2066 }
|
|
jbe@0
|
2067 /* allocate result string */
|
|
jbe@0
|
2068 res = palloc(reslen);
|
|
jbe@0
|
2069 /* set write pointer to begin of result string */
|
|
jbe@0
|
2070 resptr = res;
|
|
jbe@0
|
2071 /* copy strings into result string */
|
|
jbe@0
|
2072 for (i=0; i<cluster->nentries; i++) {
|
|
jbe@0
|
2073 npoints = cluster->entries[i].npoints;
|
|
jbe@0
|
2074 for (j=0; j<npoints+2; j++) {
|
|
jbe@0
|
2075 string = strings[i][j];
|
|
jbe@0
|
2076 strcpy(resptr, string);
|
|
jbe@0
|
2077 resptr += strlen(string);
|
|
jbe@0
|
2078 /* free strings allocated by psprintf */
|
|
jbe@0
|
2079 if (j != 0 && j != npoints+1) pfree(string);
|
|
jbe@0
|
2080 }
|
|
jbe@0
|
2081 /* free array of strings */
|
|
jbe@0
|
2082 pfree(strings[i]);
|
|
jbe@0
|
2083 }
|
|
jbe@0
|
2084 /* free array of array of strings */
|
|
jbe@0
|
2085 pfree(strings);
|
|
jbe@0
|
2086 /* free detoasted cluster (if copy) */
|
|
jbe@0
|
2087 PG_FREE_IF_COPY(cluster, 0);
|
|
jbe@0
|
2088 /* return result */
|
|
jbe@0
|
2089 PG_RETURN_CSTRING(res);
|
|
jbe@0
|
2090 }
|
|
jbe@0
|
2091
|
|
jbe@0
|
2092 /* binary input function for point ("epoint") */
|
|
jbe@0
|
2093 PG_FUNCTION_INFO_V1(pgl_epoint_recv);
|
|
jbe@0
|
2094 Datum pgl_epoint_recv(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2095 StringInfo buf = (StringInfo)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2096 pgl_point *point = (pgl_point *)palloc(sizeof(pgl_point));
|
|
jbe@0
|
2097 point->lat = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2098 point->lon = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2099 PG_RETURN_POINTER(point);
|
|
jbe@0
|
2100 }
|
|
jbe@0
|
2101
|
|
jbe@0
|
2102 /* binary input function for box ("ebox") */
|
|
jbe@0
|
2103 PG_FUNCTION_INFO_V1(pgl_ebox_recv);
|
|
jbe@0
|
2104 Datum pgl_ebox_recv(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2105 StringInfo buf = (StringInfo)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2106 pgl_box *box = (pgl_box *)palloc(sizeof(pgl_box));
|
|
jbe@0
|
2107 box->lat_min = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2108 box->lat_max = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2109 box->lon_min = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2110 box->lon_max = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2111 PG_RETURN_POINTER(box);
|
|
jbe@0
|
2112 }
|
|
jbe@0
|
2113
|
|
jbe@0
|
2114 /* binary input function for circle ("ecircle") */
|
|
jbe@0
|
2115 PG_FUNCTION_INFO_V1(pgl_ecircle_recv);
|
|
jbe@0
|
2116 Datum pgl_ecircle_recv(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2117 StringInfo buf = (StringInfo)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2118 pgl_circle *circle = (pgl_circle *)palloc(sizeof(pgl_circle));
|
|
jbe@0
|
2119 circle->center.lat = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2120 circle->center.lon = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2121 circle->radius = pq_getmsgfloat8(buf);
|
|
jbe@0
|
2122 PG_RETURN_POINTER(circle);
|
|
jbe@0
|
2123 }
|
|
jbe@0
|
2124
|
|
jbe@0
|
2125 /* TODO: binary receive function for cluster */
|
|
jbe@0
|
2126
|
|
jbe@0
|
2127 /* binary output function for point ("epoint") */
|
|
jbe@0
|
2128 PG_FUNCTION_INFO_V1(pgl_epoint_send);
|
|
jbe@0
|
2129 Datum pgl_epoint_send(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2130 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2131 StringInfoData buf;
|
|
jbe@0
|
2132 pq_begintypsend(&buf);
|
|
jbe@0
|
2133 pq_sendfloat8(&buf, point->lat);
|
|
jbe@0
|
2134 pq_sendfloat8(&buf, point->lon);
|
|
jbe@0
|
2135 PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
|
|
jbe@0
|
2136 }
|
|
jbe@0
|
2137
|
|
jbe@0
|
2138 /* binary output function for box ("ebox") */
|
|
jbe@0
|
2139 PG_FUNCTION_INFO_V1(pgl_ebox_send);
|
|
jbe@0
|
2140 Datum pgl_ebox_send(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2141 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2142 StringInfoData buf;
|
|
jbe@0
|
2143 pq_begintypsend(&buf);
|
|
jbe@0
|
2144 pq_sendfloat8(&buf, box->lat_min);
|
|
jbe@0
|
2145 pq_sendfloat8(&buf, box->lat_max);
|
|
jbe@0
|
2146 pq_sendfloat8(&buf, box->lon_min);
|
|
jbe@0
|
2147 pq_sendfloat8(&buf, box->lon_max);
|
|
jbe@0
|
2148 PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
|
|
jbe@0
|
2149 }
|
|
jbe@0
|
2150
|
|
jbe@0
|
2151 /* binary output function for circle ("ecircle") */
|
|
jbe@0
|
2152 PG_FUNCTION_INFO_V1(pgl_ecircle_send);
|
|
jbe@0
|
2153 Datum pgl_ecircle_send(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2154 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2155 StringInfoData buf;
|
|
jbe@0
|
2156 pq_begintypsend(&buf);
|
|
jbe@0
|
2157 pq_sendfloat8(&buf, circle->center.lat);
|
|
jbe@0
|
2158 pq_sendfloat8(&buf, circle->center.lon);
|
|
jbe@0
|
2159 pq_sendfloat8(&buf, circle->radius);
|
|
jbe@0
|
2160 PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
|
|
jbe@0
|
2161 }
|
|
jbe@0
|
2162
|
|
jbe@0
|
2163 /* TODO: binary send functions for cluster */
|
|
jbe@0
|
2164
|
|
jbe@0
|
2165 /* cast point ("epoint") to box ("ebox") */
|
|
jbe@0
|
2166 PG_FUNCTION_INFO_V1(pgl_epoint_to_ebox);
|
|
jbe@0
|
2167 Datum pgl_epoint_to_ebox(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2168 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2169 pgl_box *box = palloc(sizeof(pgl_box));
|
|
jbe@0
|
2170 box->lat_min = point->lat;
|
|
jbe@0
|
2171 box->lat_max = point->lat;
|
|
jbe@0
|
2172 box->lon_min = point->lon;
|
|
jbe@0
|
2173 box->lon_max = point->lon;
|
|
jbe@0
|
2174 PG_RETURN_POINTER(box);
|
|
jbe@0
|
2175 }
|
|
jbe@0
|
2176
|
|
jbe@0
|
2177 /* cast point ("epoint") to circle ("ecircle") */
|
|
jbe@0
|
2178 PG_FUNCTION_INFO_V1(pgl_epoint_to_ecircle);
|
|
jbe@0
|
2179 Datum pgl_epoint_to_ecircle(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2180 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2181 pgl_circle *circle = palloc(sizeof(pgl_box));
|
|
jbe@0
|
2182 circle->center = *point;
|
|
jbe@0
|
2183 circle->radius = 0;
|
|
jbe@0
|
2184 PG_RETURN_POINTER(circle);
|
|
jbe@0
|
2185 }
|
|
jbe@0
|
2186
|
|
jbe@0
|
2187 /* cast point ("epoint") to cluster ("ecluster") */
|
|
jbe@0
|
2188 PG_FUNCTION_INFO_V1(pgl_epoint_to_ecluster);
|
|
jbe@0
|
2189 Datum pgl_epoint_to_ecluster(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2190 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2191 pgl_newentry entry;
|
|
jbe@0
|
2192 entry.entrytype = PGL_ENTRY_POINT;
|
|
jbe@0
|
2193 entry.npoints = 1;
|
|
jbe@0
|
2194 entry.points = point;
|
|
jbe@0
|
2195 PG_RETURN_POINTER(pgl_new_cluster(1, &entry));
|
|
jbe@0
|
2196 }
|
|
jbe@0
|
2197
|
|
jbe@0
|
2198 /* cast box ("ebox") to cluster ("ecluster") */
|
|
jbe@0
|
2199 #define pgl_ebox_to_ecluster_macro(i, a, b) \
|
|
jbe@0
|
2200 entries[i].entrytype = PGL_ENTRY_POLYGON; \
|
|
jbe@0
|
2201 entries[i].npoints = 4; \
|
|
jbe@0
|
2202 entries[i].points = points[i]; \
|
|
jbe@0
|
2203 points[i][0].lat = box->lat_min; \
|
|
jbe@0
|
2204 points[i][0].lon = (a); \
|
|
jbe@0
|
2205 points[i][1].lat = box->lat_min; \
|
|
jbe@0
|
2206 points[i][1].lon = (b); \
|
|
jbe@0
|
2207 points[i][2].lat = box->lat_max; \
|
|
jbe@0
|
2208 points[i][2].lon = (b); \
|
|
jbe@0
|
2209 points[i][3].lat = box->lat_max; \
|
|
jbe@0
|
2210 points[i][3].lon = (a);
|
|
jbe@0
|
2211 PG_FUNCTION_INFO_V1(pgl_ebox_to_ecluster);
|
|
jbe@0
|
2212 Datum pgl_ebox_to_ecluster(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2213 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2214 double lon, dlon;
|
|
jbe@0
|
2215 int nentries;
|
|
jbe@0
|
2216 pgl_newentry entries[3];
|
|
jbe@0
|
2217 pgl_point points[3][4];
|
|
jbe@0
|
2218 if (box->lat_min > box->lat_max) {
|
|
jbe@0
|
2219 nentries = 0;
|
|
jbe@0
|
2220 } else if (box->lon_min > box->lon_max) {
|
|
jbe@0
|
2221 if (box->lon_min < 0) {
|
|
jbe@0
|
2222 lon = pgl_round((box->lon_min + 180) / 2.0);
|
|
jbe@0
|
2223 nentries = 3;
|
|
jbe@0
|
2224 pgl_ebox_to_ecluster_macro(0, box->lon_min, lon);
|
|
jbe@0
|
2225 pgl_ebox_to_ecluster_macro(1, lon, 180);
|
|
jbe@0
|
2226 pgl_ebox_to_ecluster_macro(2, -180, box->lon_max);
|
|
jbe@0
|
2227 } else if (box->lon_max > 0) {
|
|
jbe@0
|
2228 lon = pgl_round((box->lon_max - 180) / 2.0);
|
|
jbe@0
|
2229 nentries = 3;
|
|
jbe@0
|
2230 pgl_ebox_to_ecluster_macro(0, box->lon_min, 180);
|
|
jbe@0
|
2231 pgl_ebox_to_ecluster_macro(1, -180, lon);
|
|
jbe@0
|
2232 pgl_ebox_to_ecluster_macro(2, lon, box->lon_max);
|
|
jbe@0
|
2233 } else {
|
|
jbe@0
|
2234 nentries = 2;
|
|
jbe@0
|
2235 pgl_ebox_to_ecluster_macro(0, box->lon_min, 180);
|
|
jbe@0
|
2236 pgl_ebox_to_ecluster_macro(1, -180, box->lon_max);
|
|
jbe@0
|
2237 }
|
|
jbe@0
|
2238 } else {
|
|
jbe@0
|
2239 dlon = pgl_round(box->lon_max - box->lon_min);
|
|
jbe@0
|
2240 if (dlon < 180) {
|
|
jbe@0
|
2241 nentries = 1;
|
|
jbe@0
|
2242 pgl_ebox_to_ecluster_macro(0, box->lon_min, box->lon_max);
|
|
jbe@0
|
2243 } else {
|
|
jbe@0
|
2244 lon = pgl_round((box->lon_min + box->lon_max) / 2.0);
|
|
jbe@0
|
2245 if (
|
|
jbe@0
|
2246 pgl_round(lon - box->lon_min) < 180 &&
|
|
jbe@0
|
2247 pgl_round(box->lon_max - lon) < 180
|
|
jbe@0
|
2248 ) {
|
|
jbe@0
|
2249 nentries = 2;
|
|
jbe@0
|
2250 pgl_ebox_to_ecluster_macro(0, box->lon_min, lon);
|
|
jbe@0
|
2251 pgl_ebox_to_ecluster_macro(1, lon, box->lon_max);
|
|
jbe@0
|
2252 } else {
|
|
jbe@0
|
2253 nentries = 3;
|
|
jbe@0
|
2254 pgl_ebox_to_ecluster_macro(0, box->lon_min, -60);
|
|
jbe@0
|
2255 pgl_ebox_to_ecluster_macro(1, -60, 60);
|
|
jbe@0
|
2256 pgl_ebox_to_ecluster_macro(2, 60, box->lon_max);
|
|
jbe@0
|
2257 }
|
|
jbe@0
|
2258 }
|
|
jbe@0
|
2259 }
|
|
jbe@0
|
2260 PG_RETURN_POINTER(pgl_new_cluster(nentries, entries));
|
|
jbe@0
|
2261 }
|
|
jbe@0
|
2262
|
|
jbe@0
|
2263 /* extract latitude from point ("epoint") */
|
|
jbe@0
|
2264 PG_FUNCTION_INFO_V1(pgl_epoint_lat);
|
|
jbe@0
|
2265 Datum pgl_epoint_lat(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2266 PG_RETURN_FLOAT8(((pgl_point *)PG_GETARG_POINTER(0))->lat);
|
|
jbe@0
|
2267 }
|
|
jbe@0
|
2268
|
|
jbe@0
|
2269 /* extract longitude from point ("epoint") */
|
|
jbe@0
|
2270 PG_FUNCTION_INFO_V1(pgl_epoint_lon);
|
|
jbe@0
|
2271 Datum pgl_epoint_lon(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2272 PG_RETURN_FLOAT8(((pgl_point *)PG_GETARG_POINTER(0))->lon);
|
|
jbe@0
|
2273 }
|
|
jbe@0
|
2274
|
|
jbe@0
|
2275 /* extract minimum latitude from box ("ebox") */
|
|
jbe@0
|
2276 PG_FUNCTION_INFO_V1(pgl_ebox_lat_min);
|
|
jbe@0
|
2277 Datum pgl_ebox_lat_min(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2278 PG_RETURN_FLOAT8(((pgl_box *)PG_GETARG_POINTER(0))->lat_min);
|
|
jbe@0
|
2279 }
|
|
jbe@0
|
2280
|
|
jbe@0
|
2281 /* extract maximum latitude from box ("ebox") */
|
|
jbe@0
|
2282 PG_FUNCTION_INFO_V1(pgl_ebox_lat_max);
|
|
jbe@0
|
2283 Datum pgl_ebox_lat_max(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2284 PG_RETURN_FLOAT8(((pgl_box *)PG_GETARG_POINTER(0))->lat_max);
|
|
jbe@0
|
2285 }
|
|
jbe@0
|
2286
|
|
jbe@0
|
2287 /* extract minimum longitude from box ("ebox") */
|
|
jbe@0
|
2288 PG_FUNCTION_INFO_V1(pgl_ebox_lon_min);
|
|
jbe@0
|
2289 Datum pgl_ebox_lon_min(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2290 PG_RETURN_FLOAT8(((pgl_box *)PG_GETARG_POINTER(0))->lon_min);
|
|
jbe@0
|
2291 }
|
|
jbe@0
|
2292
|
|
jbe@0
|
2293 /* extract maximum longitude from box ("ebox") */
|
|
jbe@0
|
2294 PG_FUNCTION_INFO_V1(pgl_ebox_lon_max);
|
|
jbe@0
|
2295 Datum pgl_ebox_lon_max(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2296 PG_RETURN_FLOAT8(((pgl_box *)PG_GETARG_POINTER(0))->lon_max);
|
|
jbe@0
|
2297 }
|
|
jbe@0
|
2298
|
|
jbe@0
|
2299 /* extract center point from circle ("ecircle") */
|
|
jbe@0
|
2300 PG_FUNCTION_INFO_V1(pgl_ecircle_center);
|
|
jbe@0
|
2301 Datum pgl_ecircle_center(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2302 PG_RETURN_POINTER(&(((pgl_circle *)PG_GETARG_POINTER(0))->center));
|
|
jbe@0
|
2303 }
|
|
jbe@0
|
2304
|
|
jbe@0
|
2305 /* extract radius from circle ("ecircle") */
|
|
jbe@0
|
2306 PG_FUNCTION_INFO_V1(pgl_ecircle_radius);
|
|
jbe@0
|
2307 Datum pgl_ecircle_radius(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2308 PG_RETURN_FLOAT8(((pgl_circle *)PG_GETARG_POINTER(0))->radius);
|
|
jbe@0
|
2309 }
|
|
jbe@0
|
2310
|
|
jbe@0
|
2311 /* check if point is inside box (overlap operator "&&") in SQL */
|
|
jbe@0
|
2312 PG_FUNCTION_INFO_V1(pgl_epoint_ebox_overlap);
|
|
jbe@0
|
2313 Datum pgl_epoint_ebox_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2314 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2315 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2316 PG_RETURN_BOOL(pgl_point_in_box(point, box));
|
|
jbe@0
|
2317 }
|
|
jbe@0
|
2318
|
|
jbe@0
|
2319 /* check if point is inside circle (overlap operator "&&") in SQL */
|
|
jbe@0
|
2320 PG_FUNCTION_INFO_V1(pgl_epoint_ecircle_overlap);
|
|
jbe@0
|
2321 Datum pgl_epoint_ecircle_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2322 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2323 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2324 PG_RETURN_BOOL(
|
|
jbe@0
|
2325 pgl_distance(
|
|
jbe@0
|
2326 point->lat, point->lon,
|
|
jbe@0
|
2327 circle->center.lat, circle->center.lon
|
|
jbe@0
|
2328 ) <= circle->radius
|
|
jbe@0
|
2329 );
|
|
jbe@0
|
2330 }
|
|
jbe@0
|
2331
|
|
jbe@0
|
2332 /* check if point is inside cluster (overlap operator "&&") in SQL */
|
|
jbe@0
|
2333 PG_FUNCTION_INFO_V1(pgl_epoint_ecluster_overlap);
|
|
jbe@0
|
2334 Datum pgl_epoint_ecluster_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2335 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2336 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@16
|
2337 bool retval;
|
|
jbe@16
|
2338 /* points outside bounding circle are always assumed to be non-overlapping
|
|
jbe@16
|
2339 (necessary for consistent table and index scans) */
|
|
jbe@16
|
2340 if (
|
|
jbe@16
|
2341 pgl_distance(
|
|
jbe@16
|
2342 point->lat, point->lon,
|
|
jbe@16
|
2343 cluster->bounding.center.lat, cluster->bounding.center.lon
|
|
jbe@16
|
2344 ) > cluster->bounding.radius
|
|
jbe@16
|
2345 ) retval = false;
|
|
jbe@16
|
2346 else retval = pgl_point_in_cluster(point, cluster);
|
|
jbe@0
|
2347 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@0
|
2348 PG_RETURN_BOOL(retval);
|
|
jbe@0
|
2349 }
|
|
jbe@0
|
2350
|
|
jbe@10
|
2351 /* check if point may be inside cluster (lossy overl. operator "&&+") in SQL */
|
|
jbe@10
|
2352 PG_FUNCTION_INFO_V1(pgl_epoint_ecluster_may_overlap);
|
|
jbe@10
|
2353 Datum pgl_epoint_ecluster_may_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@10
|
2354 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@10
|
2355 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@10
|
2356 bool retval = pgl_distance(
|
|
jbe@10
|
2357 point->lat, point->lon,
|
|
jbe@10
|
2358 cluster->bounding.center.lat, cluster->bounding.center.lon
|
|
jbe@10
|
2359 ) <= cluster->bounding.radius;
|
|
jbe@10
|
2360 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@10
|
2361 PG_RETURN_BOOL(retval);
|
|
jbe@10
|
2362 }
|
|
jbe@10
|
2363
|
|
jbe@0
|
2364 /* check if two boxes overlap (overlap operator "&&") in SQL */
|
|
jbe@0
|
2365 PG_FUNCTION_INFO_V1(pgl_ebox_overlap);
|
|
jbe@0
|
2366 Datum pgl_ebox_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2367 pgl_box *box1 = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2368 pgl_box *box2 = (pgl_box *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2369 PG_RETURN_BOOL(pgl_boxes_overlap(box1, box2));
|
|
jbe@0
|
2370 }
|
|
jbe@0
|
2371
|
|
jbe@10
|
2372 /* check if box and circle may overlap (lossy overl. operator "&&+") in SQL */
|
|
jbe@10
|
2373 PG_FUNCTION_INFO_V1(pgl_ebox_ecircle_may_overlap);
|
|
jbe@10
|
2374 Datum pgl_ebox_ecircle_may_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@10
|
2375 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@10
|
2376 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@10
|
2377 PG_RETURN_BOOL(
|
|
jbe@10
|
2378 pgl_estimate_point_box_distance(&circle->center, box) <= circle->radius
|
|
jbe@10
|
2379 );
|
|
jbe@10
|
2380 }
|
|
jbe@10
|
2381
|
|
jbe@10
|
2382 /* check if box and cluster may overlap (lossy overl. operator "&&+") in SQL */
|
|
jbe@10
|
2383 PG_FUNCTION_INFO_V1(pgl_ebox_ecluster_may_overlap);
|
|
jbe@10
|
2384 Datum pgl_ebox_ecluster_may_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@10
|
2385 pgl_box *box = (pgl_box *)PG_GETARG_POINTER(0);
|
|
jbe@10
|
2386 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@10
|
2387 bool retval = pgl_estimate_point_box_distance(
|
|
jbe@10
|
2388 &cluster->bounding.center,
|
|
jbe@10
|
2389 box
|
|
jbe@10
|
2390 ) <= cluster->bounding.radius;
|
|
jbe@10
|
2391 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@10
|
2392 PG_RETURN_BOOL(retval);
|
|
jbe@10
|
2393 }
|
|
jbe@10
|
2394
|
|
jbe@0
|
2395 /* check if two circles overlap (overlap operator "&&") in SQL */
|
|
jbe@0
|
2396 PG_FUNCTION_INFO_V1(pgl_ecircle_overlap);
|
|
jbe@0
|
2397 Datum pgl_ecircle_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2398 pgl_circle *circle1 = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2399 pgl_circle *circle2 = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2400 PG_RETURN_BOOL(
|
|
jbe@0
|
2401 pgl_distance(
|
|
jbe@0
|
2402 circle1->center.lat, circle1->center.lon,
|
|
jbe@0
|
2403 circle2->center.lat, circle2->center.lon
|
|
jbe@0
|
2404 ) <= circle1->radius + circle2->radius
|
|
jbe@0
|
2405 );
|
|
jbe@0
|
2406 }
|
|
jbe@0
|
2407
|
|
jbe@0
|
2408 /* check if circle and cluster overlap (overlap operator "&&") in SQL */
|
|
jbe@0
|
2409 PG_FUNCTION_INFO_V1(pgl_ecircle_ecluster_overlap);
|
|
jbe@0
|
2410 Datum pgl_ecircle_ecluster_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2411 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2412 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@0
|
2413 bool retval = (
|
|
jbe@0
|
2414 pgl_point_cluster_distance(&(circle->center), cluster) <= circle->radius
|
|
jbe@0
|
2415 );
|
|
jbe@0
|
2416 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@0
|
2417 PG_RETURN_BOOL(retval);
|
|
jbe@0
|
2418 }
|
|
jbe@0
|
2419
|
|
jbe@17
|
2420 /* check if circle and cluster may overlap (l. ov. operator "&&+") in SQL */
|
|
jbe@10
|
2421 PG_FUNCTION_INFO_V1(pgl_ecircle_ecluster_may_overlap);
|
|
jbe@10
|
2422 Datum pgl_ecircle_ecluster_may_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@10
|
2423 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@10
|
2424 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@10
|
2425 bool retval = pgl_distance(
|
|
jbe@10
|
2426 circle->center.lat, circle->center.lon,
|
|
jbe@10
|
2427 cluster->bounding.center.lat, cluster->bounding.center.lon
|
|
jbe@10
|
2428 ) <= circle->radius + cluster->bounding.radius;
|
|
jbe@10
|
2429 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@10
|
2430 PG_RETURN_BOOL(retval);
|
|
jbe@10
|
2431 }
|
|
jbe@10
|
2432
|
|
jbe@16
|
2433 /* check if two clusters overlap (overlap operator "&&") in SQL */
|
|
jbe@16
|
2434 PG_FUNCTION_INFO_V1(pgl_ecluster_overlap);
|
|
jbe@16
|
2435 Datum pgl_ecluster_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@16
|
2436 pgl_cluster *cluster1 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
|
|
jbe@16
|
2437 pgl_cluster *cluster2 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@16
|
2438 bool retval;
|
|
jbe@16
|
2439 /* clusters with non-touching bounding circles are always assumed to be
|
|
jbe@16
|
2440 non-overlapping (improves performance and is necessary for consistent
|
|
jbe@16
|
2441 table and index scans) */
|
|
jbe@16
|
2442 if (
|
|
jbe@16
|
2443 pgl_distance(
|
|
jbe@16
|
2444 cluster1->bounding.center.lat, cluster1->bounding.center.lon,
|
|
jbe@16
|
2445 cluster2->bounding.center.lat, cluster2->bounding.center.lon
|
|
jbe@16
|
2446 ) > cluster1->bounding.radius + cluster2->bounding.radius
|
|
jbe@16
|
2447 ) retval = false;
|
|
jbe@16
|
2448 else retval = pgl_clusters_overlap(cluster1, cluster2);
|
|
jbe@16
|
2449 PG_FREE_IF_COPY(cluster1, 0);
|
|
jbe@16
|
2450 PG_FREE_IF_COPY(cluster2, 1);
|
|
jbe@16
|
2451 PG_RETURN_BOOL(retval);
|
|
jbe@16
|
2452 }
|
|
jbe@16
|
2453
|
|
jbe@10
|
2454 /* check if two clusters may overlap (lossy overlap operator "&&+") in SQL */
|
|
jbe@10
|
2455 PG_FUNCTION_INFO_V1(pgl_ecluster_may_overlap);
|
|
jbe@10
|
2456 Datum pgl_ecluster_may_overlap(PG_FUNCTION_ARGS) {
|
|
jbe@10
|
2457 pgl_cluster *cluster1 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
|
|
jbe@10
|
2458 pgl_cluster *cluster2 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@10
|
2459 bool retval = pgl_distance(
|
|
jbe@10
|
2460 cluster1->bounding.center.lat, cluster1->bounding.center.lon,
|
|
jbe@10
|
2461 cluster2->bounding.center.lat, cluster2->bounding.center.lon
|
|
jbe@10
|
2462 ) <= cluster1->bounding.radius + cluster2->bounding.radius;
|
|
jbe@10
|
2463 PG_FREE_IF_COPY(cluster1, 0);
|
|
jbe@10
|
2464 PG_FREE_IF_COPY(cluster2, 1);
|
|
jbe@10
|
2465 PG_RETURN_BOOL(retval);
|
|
jbe@10
|
2466 }
|
|
jbe@10
|
2467
|
|
jbe@16
|
2468 /* check if second cluster is in first cluster (cont. operator "@>) in SQL */
|
|
jbe@16
|
2469 PG_FUNCTION_INFO_V1(pgl_ecluster_contains);
|
|
jbe@16
|
2470 Datum pgl_ecluster_contains(PG_FUNCTION_ARGS) {
|
|
jbe@16
|
2471 pgl_cluster *outer = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
|
|
jbe@16
|
2472 pgl_cluster *inner = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@16
|
2473 bool retval;
|
|
jbe@16
|
2474 /* clusters with non-touching bounding circles are always assumed to be
|
|
jbe@16
|
2475 non-overlapping (improves performance and is necessary for consistent
|
|
jbe@16
|
2476 table and index scans) */
|
|
jbe@16
|
2477 if (
|
|
jbe@16
|
2478 pgl_distance(
|
|
jbe@16
|
2479 outer->bounding.center.lat, outer->bounding.center.lon,
|
|
jbe@16
|
2480 inner->bounding.center.lat, inner->bounding.center.lon
|
|
jbe@16
|
2481 ) > outer->bounding.radius + inner->bounding.radius
|
|
jbe@16
|
2482 ) retval = false;
|
|
jbe@16
|
2483 else retval = pgl_cluster_in_cluster(outer, inner);
|
|
jbe@16
|
2484 PG_FREE_IF_COPY(outer, 0);
|
|
jbe@16
|
2485 PG_FREE_IF_COPY(inner, 1);
|
|
jbe@16
|
2486 PG_RETURN_BOOL(retval);
|
|
jbe@16
|
2487 }
|
|
jbe@16
|
2488
|
|
jbe@0
|
2489 /* calculate distance between two points ("<->" operator) in SQL */
|
|
jbe@0
|
2490 PG_FUNCTION_INFO_V1(pgl_epoint_distance);
|
|
jbe@0
|
2491 Datum pgl_epoint_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2492 pgl_point *point1 = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2493 pgl_point *point2 = (pgl_point *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2494 PG_RETURN_FLOAT8(pgl_distance(
|
|
jbe@0
|
2495 point1->lat, point1->lon, point2->lat, point2->lon
|
|
jbe@0
|
2496 ));
|
|
jbe@0
|
2497 }
|
|
jbe@0
|
2498
|
|
jbe@0
|
2499 /* calculate point to circle distance ("<->" operator) in SQL */
|
|
jbe@0
|
2500 PG_FUNCTION_INFO_V1(pgl_epoint_ecircle_distance);
|
|
jbe@0
|
2501 Datum pgl_epoint_ecircle_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2502 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2503 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2504 double distance = pgl_distance(
|
|
jbe@0
|
2505 point->lat, point->lon, circle->center.lat, circle->center.lon
|
|
jbe@0
|
2506 ) - circle->radius;
|
|
jbe@0
|
2507 PG_RETURN_FLOAT8((distance <= 0) ? 0 : distance);
|
|
jbe@0
|
2508 }
|
|
jbe@0
|
2509
|
|
jbe@0
|
2510 /* calculate point to cluster distance ("<->" operator) in SQL */
|
|
jbe@0
|
2511 PG_FUNCTION_INFO_V1(pgl_epoint_ecluster_distance);
|
|
jbe@0
|
2512 Datum pgl_epoint_ecluster_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2513 pgl_point *point = (pgl_point *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2514 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@0
|
2515 double distance = pgl_point_cluster_distance(point, cluster);
|
|
jbe@0
|
2516 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@0
|
2517 PG_RETURN_FLOAT8(distance);
|
|
jbe@0
|
2518 }
|
|
jbe@0
|
2519
|
|
jbe@0
|
2520 /* calculate distance between two circles ("<->" operator) in SQL */
|
|
jbe@0
|
2521 PG_FUNCTION_INFO_V1(pgl_ecircle_distance);
|
|
jbe@0
|
2522 Datum pgl_ecircle_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2523 pgl_circle *circle1 = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2524 pgl_circle *circle2 = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2525 double distance = pgl_distance(
|
|
jbe@0
|
2526 circle1->center.lat, circle1->center.lon,
|
|
jbe@0
|
2527 circle2->center.lat, circle2->center.lon
|
|
jbe@0
|
2528 ) - (circle1->radius + circle2->radius);
|
|
jbe@0
|
2529 PG_RETURN_FLOAT8((distance <= 0) ? 0 : distance);
|
|
jbe@0
|
2530 }
|
|
jbe@0
|
2531
|
|
jbe@0
|
2532 /* calculate circle to cluster distance ("<->" operator) in SQL */
|
|
jbe@0
|
2533 PG_FUNCTION_INFO_V1(pgl_ecircle_ecluster_distance);
|
|
jbe@0
|
2534 Datum pgl_ecircle_ecluster_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2535 pgl_circle *circle = (pgl_circle *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2536 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@0
|
2537 double distance = (
|
|
jbe@0
|
2538 pgl_point_cluster_distance(&(circle->center), cluster) - circle->radius
|
|
jbe@0
|
2539 );
|
|
jbe@0
|
2540 PG_FREE_IF_COPY(cluster, 1);
|
|
jbe@0
|
2541 PG_RETURN_FLOAT8((distance <= 0) ? 0 : distance);
|
|
jbe@0
|
2542 }
|
|
jbe@0
|
2543
|
|
jbe@16
|
2544 /* calculate distance between two clusters ("<->" operator) in SQL */
|
|
jbe@16
|
2545 PG_FUNCTION_INFO_V1(pgl_ecluster_distance);
|
|
jbe@16
|
2546 Datum pgl_ecluster_distance(PG_FUNCTION_ARGS) {
|
|
jbe@16
|
2547 pgl_cluster *cluster1 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
|
|
jbe@16
|
2548 pgl_cluster *cluster2 = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@16
|
2549 double retval = pgl_cluster_distance(cluster1, cluster2);
|
|
jbe@16
|
2550 PG_FREE_IF_COPY(cluster1, 0);
|
|
jbe@16
|
2551 PG_FREE_IF_COPY(cluster2, 1);
|
|
jbe@16
|
2552 PG_RETURN_FLOAT8(retval);
|
|
jbe@16
|
2553 }
|
|
jbe@16
|
2554
|
|
jbe@0
|
2555
|
|
jbe@0
|
2556 /*-----------------------------------------------------------*
|
|
jbe@0
|
2557 * B-tree comparison operators and index support functions *
|
|
jbe@0
|
2558 *-----------------------------------------------------------*/
|
|
jbe@0
|
2559
|
|
jbe@0
|
2560 /* macro for a B-tree operator (without detoasting) */
|
|
jbe@0
|
2561 #define PGL_BTREE_OPER(func, type, cmpfunc, oper) \
|
|
jbe@0
|
2562 PG_FUNCTION_INFO_V1(func); \
|
|
jbe@0
|
2563 Datum func(PG_FUNCTION_ARGS) { \
|
|
jbe@0
|
2564 type *a = (type *)PG_GETARG_POINTER(0); \
|
|
jbe@0
|
2565 type *b = (type *)PG_GETARG_POINTER(1); \
|
|
jbe@0
|
2566 PG_RETURN_BOOL(cmpfunc(a, b) oper 0); \
|
|
jbe@0
|
2567 }
|
|
jbe@0
|
2568
|
|
jbe@0
|
2569 /* macro for a B-tree comparison function (without detoasting) */
|
|
jbe@0
|
2570 #define PGL_BTREE_CMP(func, type, cmpfunc) \
|
|
jbe@0
|
2571 PG_FUNCTION_INFO_V1(func); \
|
|
jbe@0
|
2572 Datum func(PG_FUNCTION_ARGS) { \
|
|
jbe@0
|
2573 type *a = (type *)PG_GETARG_POINTER(0); \
|
|
jbe@0
|
2574 type *b = (type *)PG_GETARG_POINTER(1); \
|
|
jbe@0
|
2575 PG_RETURN_INT32(cmpfunc(a, b)); \
|
|
jbe@0
|
2576 }
|
|
jbe@0
|
2577
|
|
jbe@0
|
2578 /* macro for a B-tree operator (with detoasting) */
|
|
jbe@0
|
2579 #define PGL_BTREE_OPER_DETOAST(func, type, cmpfunc, oper) \
|
|
jbe@0
|
2580 PG_FUNCTION_INFO_V1(func); \
|
|
jbe@0
|
2581 Datum func(PG_FUNCTION_ARGS) { \
|
|
jbe@0
|
2582 bool res; \
|
|
jbe@0
|
2583 type *a = (type *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0)); \
|
|
jbe@0
|
2584 type *b = (type *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1)); \
|
|
jbe@0
|
2585 res = cmpfunc(a, b) oper 0; \
|
|
jbe@0
|
2586 PG_FREE_IF_COPY(a, 0); \
|
|
jbe@0
|
2587 PG_FREE_IF_COPY(b, 1); \
|
|
jbe@0
|
2588 PG_RETURN_BOOL(res); \
|
|
jbe@0
|
2589 }
|
|
jbe@0
|
2590
|
|
jbe@0
|
2591 /* macro for a B-tree comparison function (with detoasting) */
|
|
jbe@0
|
2592 #define PGL_BTREE_CMP_DETOAST(func, type, cmpfunc) \
|
|
jbe@0
|
2593 PG_FUNCTION_INFO_V1(func); \
|
|
jbe@0
|
2594 Datum func(PG_FUNCTION_ARGS) { \
|
|
jbe@0
|
2595 int32_t res; \
|
|
jbe@0
|
2596 type *a = (type *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0)); \
|
|
jbe@0
|
2597 type *b = (type *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1)); \
|
|
jbe@0
|
2598 res = cmpfunc(a, b); \
|
|
jbe@0
|
2599 PG_FREE_IF_COPY(a, 0); \
|
|
jbe@0
|
2600 PG_FREE_IF_COPY(b, 1); \
|
|
jbe@0
|
2601 PG_RETURN_INT32(res); \
|
|
jbe@0
|
2602 }
|
|
jbe@0
|
2603
|
|
jbe@0
|
2604 /* B-tree operators and comparison function for point */
|
|
jbe@0
|
2605 PGL_BTREE_OPER(pgl_btree_epoint_lt, pgl_point, pgl_point_cmp, <)
|
|
jbe@0
|
2606 PGL_BTREE_OPER(pgl_btree_epoint_le, pgl_point, pgl_point_cmp, <=)
|
|
jbe@0
|
2607 PGL_BTREE_OPER(pgl_btree_epoint_eq, pgl_point, pgl_point_cmp, ==)
|
|
jbe@0
|
2608 PGL_BTREE_OPER(pgl_btree_epoint_ne, pgl_point, pgl_point_cmp, !=)
|
|
jbe@0
|
2609 PGL_BTREE_OPER(pgl_btree_epoint_ge, pgl_point, pgl_point_cmp, >=)
|
|
jbe@0
|
2610 PGL_BTREE_OPER(pgl_btree_epoint_gt, pgl_point, pgl_point_cmp, >)
|
|
jbe@0
|
2611 PGL_BTREE_CMP(pgl_btree_epoint_cmp, pgl_point, pgl_point_cmp)
|
|
jbe@0
|
2612
|
|
jbe@0
|
2613 /* B-tree operators and comparison function for box */
|
|
jbe@0
|
2614 PGL_BTREE_OPER(pgl_btree_ebox_lt, pgl_box, pgl_box_cmp, <)
|
|
jbe@0
|
2615 PGL_BTREE_OPER(pgl_btree_ebox_le, pgl_box, pgl_box_cmp, <=)
|
|
jbe@0
|
2616 PGL_BTREE_OPER(pgl_btree_ebox_eq, pgl_box, pgl_box_cmp, ==)
|
|
jbe@0
|
2617 PGL_BTREE_OPER(pgl_btree_ebox_ne, pgl_box, pgl_box_cmp, !=)
|
|
jbe@0
|
2618 PGL_BTREE_OPER(pgl_btree_ebox_ge, pgl_box, pgl_box_cmp, >=)
|
|
jbe@0
|
2619 PGL_BTREE_OPER(pgl_btree_ebox_gt, pgl_box, pgl_box_cmp, >)
|
|
jbe@0
|
2620 PGL_BTREE_CMP(pgl_btree_ebox_cmp, pgl_box, pgl_box_cmp)
|
|
jbe@0
|
2621
|
|
jbe@0
|
2622 /* B-tree operators and comparison function for circle */
|
|
jbe@0
|
2623 PGL_BTREE_OPER(pgl_btree_ecircle_lt, pgl_circle, pgl_circle_cmp, <)
|
|
jbe@0
|
2624 PGL_BTREE_OPER(pgl_btree_ecircle_le, pgl_circle, pgl_circle_cmp, <=)
|
|
jbe@0
|
2625 PGL_BTREE_OPER(pgl_btree_ecircle_eq, pgl_circle, pgl_circle_cmp, ==)
|
|
jbe@0
|
2626 PGL_BTREE_OPER(pgl_btree_ecircle_ne, pgl_circle, pgl_circle_cmp, !=)
|
|
jbe@0
|
2627 PGL_BTREE_OPER(pgl_btree_ecircle_ge, pgl_circle, pgl_circle_cmp, >=)
|
|
jbe@0
|
2628 PGL_BTREE_OPER(pgl_btree_ecircle_gt, pgl_circle, pgl_circle_cmp, >)
|
|
jbe@0
|
2629 PGL_BTREE_CMP(pgl_btree_ecircle_cmp, pgl_circle, pgl_circle_cmp)
|
|
jbe@0
|
2630
|
|
jbe@0
|
2631
|
|
jbe@0
|
2632 /*--------------------------------*
|
|
jbe@0
|
2633 * GiST index support functions *
|
|
jbe@0
|
2634 *--------------------------------*/
|
|
jbe@0
|
2635
|
|
jbe@0
|
2636 /* GiST "consistent" support function */
|
|
jbe@0
|
2637 PG_FUNCTION_INFO_V1(pgl_gist_consistent);
|
|
jbe@0
|
2638 Datum pgl_gist_consistent(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2639 GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
jbe@0
|
2640 pgl_keyptr key = (pgl_keyptr)DatumGetPointer(entry->key);
|
|
jbe@0
|
2641 StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);
|
|
jbe@0
|
2642 bool *recheck = (bool *)PG_GETARG_POINTER(4);
|
|
jbe@0
|
2643 /* demand recheck because index and query methods are lossy */
|
|
jbe@0
|
2644 *recheck = true;
|
|
jbe@10
|
2645 /* strategy number aliases for different operators using the same strategy */
|
|
jbe@10
|
2646 strategy %= 100;
|
|
jbe@0
|
2647 /* strategy number 11: equality of two points */
|
|
jbe@0
|
2648 if (strategy == 11) {
|
|
jbe@0
|
2649 /* query datum is another point */
|
|
jbe@0
|
2650 pgl_point *query = (pgl_point *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2651 /* convert other point to key */
|
|
jbe@0
|
2652 pgl_pointkey querykey;
|
|
jbe@0
|
2653 pgl_point_to_key(query, querykey);
|
|
jbe@0
|
2654 /* return true if both keys overlap */
|
|
jbe@0
|
2655 PG_RETURN_BOOL(pgl_keys_overlap(key, querykey));
|
|
jbe@0
|
2656 }
|
|
jbe@0
|
2657 /* strategy number 13: equality of two circles */
|
|
jbe@0
|
2658 if (strategy == 13) {
|
|
jbe@0
|
2659 /* query datum is another circle */
|
|
jbe@0
|
2660 pgl_circle *query = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2661 /* convert other circle to key */
|
|
jbe@0
|
2662 pgl_areakey querykey;
|
|
jbe@0
|
2663 pgl_circle_to_key(query, querykey);
|
|
jbe@0
|
2664 /* return true if both keys overlap */
|
|
jbe@0
|
2665 PG_RETURN_BOOL(pgl_keys_overlap(key, querykey));
|
|
jbe@0
|
2666 }
|
|
jbe@0
|
2667 /* for all remaining strategies, keys on empty objects produce no match */
|
|
jbe@0
|
2668 /* (check necessary because query radius may be infinite) */
|
|
jbe@0
|
2669 if (PGL_KEY_IS_EMPTY(key)) PG_RETURN_BOOL(false);
|
|
jbe@0
|
2670 /* strategy number 21: overlapping with point */
|
|
jbe@0
|
2671 if (strategy == 21) {
|
|
jbe@0
|
2672 /* query datum is a point */
|
|
jbe@0
|
2673 pgl_point *query = (pgl_point *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2674 /* return true if estimated distance (allowed to be smaller than real
|
|
jbe@0
|
2675 distance) between index key and point is zero */
|
|
jbe@0
|
2676 PG_RETURN_BOOL(pgl_estimate_key_distance(key, query) == 0);
|
|
jbe@0
|
2677 }
|
|
jbe@0
|
2678 /* strategy number 22: (point) overlapping with box */
|
|
jbe@0
|
2679 if (strategy == 22) {
|
|
jbe@0
|
2680 /* query datum is a box */
|
|
jbe@0
|
2681 pgl_box *query = (pgl_box *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2682 /* determine bounding box of indexed key */
|
|
jbe@0
|
2683 pgl_box keybox;
|
|
jbe@0
|
2684 pgl_key_to_box(key, &keybox);
|
|
jbe@0
|
2685 /* return true if query box overlaps with bounding box of indexed key */
|
|
jbe@0
|
2686 PG_RETURN_BOOL(pgl_boxes_overlap(query, &keybox));
|
|
jbe@0
|
2687 }
|
|
jbe@0
|
2688 /* strategy number 23: overlapping with circle */
|
|
jbe@0
|
2689 if (strategy == 23) {
|
|
jbe@0
|
2690 /* query datum is a circle */
|
|
jbe@0
|
2691 pgl_circle *query = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2692 /* return true if estimated distance (allowed to be smaller than real
|
|
jbe@0
|
2693 distance) between index key and circle center is smaller than radius */
|
|
jbe@0
|
2694 PG_RETURN_BOOL(
|
|
jbe@0
|
2695 pgl_estimate_key_distance(key, &(query->center)) <= query->radius
|
|
jbe@0
|
2696 );
|
|
jbe@0
|
2697 }
|
|
jbe@0
|
2698 /* strategy number 24: overlapping with cluster */
|
|
jbe@0
|
2699 if (strategy == 24) {
|
|
jbe@0
|
2700 bool retval; /* return value */
|
|
jbe@0
|
2701 /* query datum is a cluster */
|
|
jbe@0
|
2702 pgl_cluster *query = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@0
|
2703 /* return true if estimated distance (allowed to be smaller than real
|
|
jbe@0
|
2704 distance) between index key and circle center is smaller than radius */
|
|
jbe@0
|
2705 retval = (
|
|
jbe@0
|
2706 pgl_estimate_key_distance(key, &(query->bounding.center)) <=
|
|
jbe@0
|
2707 query->bounding.radius
|
|
jbe@0
|
2708 );
|
|
jbe@0
|
2709 PG_FREE_IF_COPY(query, 1); /* free detoasted cluster (if copy) */
|
|
jbe@0
|
2710 PG_RETURN_BOOL(retval);
|
|
jbe@0
|
2711 }
|
|
jbe@0
|
2712 /* throw error for any unknown strategy number */
|
|
jbe@0
|
2713 elog(ERROR, "unrecognized strategy number: %d", strategy);
|
|
jbe@0
|
2714 }
|
|
jbe@0
|
2715
|
|
jbe@0
|
2716 /* GiST "union" support function */
|
|
jbe@0
|
2717 PG_FUNCTION_INFO_V1(pgl_gist_union);
|
|
jbe@0
|
2718 Datum pgl_gist_union(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2719 GistEntryVector *entryvec = (GistEntryVector *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2720 pgl_keyptr out; /* return value (to be palloc'ed) */
|
|
jbe@0
|
2721 int i;
|
|
jbe@0
|
2722 /* determine key size */
|
|
jbe@0
|
2723 size_t keysize = PGL_KEY_IS_AREAKEY(
|
|
jbe@0
|
2724 (pgl_keyptr)DatumGetPointer(entryvec->vector[0].key)
|
|
jbe@0
|
2725 ) ? sizeof (pgl_areakey) : sizeof(pgl_pointkey);
|
|
jbe@0
|
2726 /* begin with first key as result */
|
|
jbe@0
|
2727 out = palloc(keysize);
|
|
jbe@0
|
2728 memcpy(out, (pgl_keyptr)DatumGetPointer(entryvec->vector[0].key), keysize);
|
|
jbe@0
|
2729 /* unite current result with second, third, etc. key */
|
|
jbe@0
|
2730 for (i=1; i<entryvec->n; i++) {
|
|
jbe@0
|
2731 pgl_unite_keys(out, (pgl_keyptr)DatumGetPointer(entryvec->vector[i].key));
|
|
jbe@0
|
2732 }
|
|
jbe@0
|
2733 /* return result */
|
|
jbe@0
|
2734 PG_RETURN_POINTER(out);
|
|
jbe@0
|
2735 }
|
|
jbe@0
|
2736
|
|
jbe@0
|
2737 /* GiST "compress" support function for indicis on points */
|
|
jbe@0
|
2738 PG_FUNCTION_INFO_V1(pgl_gist_compress_epoint);
|
|
jbe@0
|
2739 Datum pgl_gist_compress_epoint(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2740 GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
jbe@0
|
2741 GISTENTRY *retval; /* return value (to be palloc'ed unless set to entry) */
|
|
jbe@0
|
2742 /* only transform new leaves */
|
|
jbe@0
|
2743 if (entry->leafkey) {
|
|
jbe@0
|
2744 /* get point to be transformed */
|
|
jbe@0
|
2745 pgl_point *point = (pgl_point *)DatumGetPointer(entry->key);
|
|
jbe@0
|
2746 /* allocate memory for key */
|
|
jbe@0
|
2747 pgl_keyptr key = palloc(sizeof(pgl_pointkey));
|
|
jbe@0
|
2748 /* transform point to key */
|
|
jbe@0
|
2749 pgl_point_to_key(point, key);
|
|
jbe@0
|
2750 /* create new GISTENTRY structure as return value */
|
|
jbe@0
|
2751 retval = palloc(sizeof(GISTENTRY));
|
|
jbe@0
|
2752 gistentryinit(
|
|
jbe@0
|
2753 *retval, PointerGetDatum(key),
|
|
jbe@0
|
2754 entry->rel, entry->page, entry->offset, FALSE
|
|
jbe@0
|
2755 );
|
|
jbe@0
|
2756 } else {
|
|
jbe@0
|
2757 /* inner nodes have already been transformed */
|
|
jbe@0
|
2758 retval = entry;
|
|
jbe@0
|
2759 }
|
|
jbe@0
|
2760 /* return pointer to old or new GISTENTRY structure */
|
|
jbe@0
|
2761 PG_RETURN_POINTER(retval);
|
|
jbe@0
|
2762 }
|
|
jbe@0
|
2763
|
|
jbe@0
|
2764 /* GiST "compress" support function for indicis on circles */
|
|
jbe@0
|
2765 PG_FUNCTION_INFO_V1(pgl_gist_compress_ecircle);
|
|
jbe@0
|
2766 Datum pgl_gist_compress_ecircle(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2767 GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
jbe@0
|
2768 GISTENTRY *retval; /* return value (to be palloc'ed unless set to entry) */
|
|
jbe@0
|
2769 /* only transform new leaves */
|
|
jbe@0
|
2770 if (entry->leafkey) {
|
|
jbe@0
|
2771 /* get circle to be transformed */
|
|
jbe@0
|
2772 pgl_circle *circle = (pgl_circle *)DatumGetPointer(entry->key);
|
|
jbe@0
|
2773 /* allocate memory for key */
|
|
jbe@0
|
2774 pgl_keyptr key = palloc(sizeof(pgl_areakey));
|
|
jbe@0
|
2775 /* transform circle to key */
|
|
jbe@0
|
2776 pgl_circle_to_key(circle, key);
|
|
jbe@0
|
2777 /* create new GISTENTRY structure as return value */
|
|
jbe@0
|
2778 retval = palloc(sizeof(GISTENTRY));
|
|
jbe@0
|
2779 gistentryinit(
|
|
jbe@0
|
2780 *retval, PointerGetDatum(key),
|
|
jbe@0
|
2781 entry->rel, entry->page, entry->offset, FALSE
|
|
jbe@0
|
2782 );
|
|
jbe@0
|
2783 } else {
|
|
jbe@0
|
2784 /* inner nodes have already been transformed */
|
|
jbe@0
|
2785 retval = entry;
|
|
jbe@0
|
2786 }
|
|
jbe@0
|
2787 /* return pointer to old or new GISTENTRY structure */
|
|
jbe@0
|
2788 PG_RETURN_POINTER(retval);
|
|
jbe@0
|
2789 }
|
|
jbe@0
|
2790
|
|
jbe@0
|
2791 /* GiST "compress" support function for indices on clusters */
|
|
jbe@0
|
2792 PG_FUNCTION_INFO_V1(pgl_gist_compress_ecluster);
|
|
jbe@0
|
2793 Datum pgl_gist_compress_ecluster(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2794 GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
jbe@0
|
2795 GISTENTRY *retval; /* return value (to be palloc'ed unless set to entry) */
|
|
jbe@0
|
2796 /* only transform new leaves */
|
|
jbe@0
|
2797 if (entry->leafkey) {
|
|
jbe@0
|
2798 /* get cluster to be transformed (detoasting necessary!) */
|
|
jbe@0
|
2799 pgl_cluster *cluster = (pgl_cluster *)PG_DETOAST_DATUM(entry->key);
|
|
jbe@0
|
2800 /* allocate memory for key */
|
|
jbe@0
|
2801 pgl_keyptr key = palloc(sizeof(pgl_areakey));
|
|
jbe@0
|
2802 /* transform cluster to key */
|
|
jbe@0
|
2803 pgl_circle_to_key(&(cluster->bounding), key);
|
|
jbe@0
|
2804 /* create new GISTENTRY structure as return value */
|
|
jbe@0
|
2805 retval = palloc(sizeof(GISTENTRY));
|
|
jbe@0
|
2806 gistentryinit(
|
|
jbe@0
|
2807 *retval, PointerGetDatum(key),
|
|
jbe@0
|
2808 entry->rel, entry->page, entry->offset, FALSE
|
|
jbe@0
|
2809 );
|
|
jbe@0
|
2810 /* free detoasted datum */
|
|
jbe@0
|
2811 if ((void *)cluster != (void *)DatumGetPointer(entry->key)) pfree(cluster);
|
|
jbe@0
|
2812 } else {
|
|
jbe@0
|
2813 /* inner nodes have already been transformed */
|
|
jbe@0
|
2814 retval = entry;
|
|
jbe@0
|
2815 }
|
|
jbe@0
|
2816 /* return pointer to old or new GISTENTRY structure */
|
|
jbe@0
|
2817 PG_RETURN_POINTER(retval);
|
|
jbe@0
|
2818 }
|
|
jbe@0
|
2819
|
|
jbe@0
|
2820 /* GiST "decompress" support function for indices */
|
|
jbe@0
|
2821 PG_FUNCTION_INFO_V1(pgl_gist_decompress);
|
|
jbe@0
|
2822 Datum pgl_gist_decompress(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2823 /* return passed pointer without transformation */
|
|
jbe@0
|
2824 PG_RETURN_POINTER(PG_GETARG_POINTER(0));
|
|
jbe@0
|
2825 }
|
|
jbe@0
|
2826
|
|
jbe@0
|
2827 /* GiST "penalty" support function */
|
|
jbe@0
|
2828 PG_FUNCTION_INFO_V1(pgl_gist_penalty);
|
|
jbe@0
|
2829 Datum pgl_gist_penalty(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2830 GISTENTRY *origentry = (GISTENTRY *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2831 GISTENTRY *newentry = (GISTENTRY *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2832 float *penalty = (float *)PG_GETARG_POINTER(2);
|
|
jbe@0
|
2833 /* get original key and key to insert */
|
|
jbe@0
|
2834 pgl_keyptr orig = (pgl_keyptr)DatumGetPointer(origentry->key);
|
|
jbe@0
|
2835 pgl_keyptr new = (pgl_keyptr)DatumGetPointer(newentry->key);
|
|
jbe@0
|
2836 /* copy original key */
|
|
jbe@0
|
2837 union { pgl_pointkey pointkey; pgl_areakey areakey; } union_key;
|
|
jbe@0
|
2838 if (PGL_KEY_IS_AREAKEY(orig)) {
|
|
jbe@0
|
2839 memcpy(union_key.areakey, orig, sizeof(union_key.areakey));
|
|
jbe@0
|
2840 } else {
|
|
jbe@0
|
2841 memcpy(union_key.pointkey, orig, sizeof(union_key.pointkey));
|
|
jbe@0
|
2842 }
|
|
jbe@0
|
2843 /* calculate union of both keys */
|
|
jbe@0
|
2844 pgl_unite_keys((pgl_keyptr)&union_key, new);
|
|
jbe@0
|
2845 /* penalty equal to reduction of key length (logarithm of added area) */
|
|
jbe@0
|
2846 /* (return value by setting referenced value and returning pointer) */
|
|
jbe@0
|
2847 *penalty = (
|
|
jbe@0
|
2848 PGL_KEY_NODEDEPTH(orig) - PGL_KEY_NODEDEPTH((pgl_keyptr)&union_key)
|
|
jbe@0
|
2849 );
|
|
jbe@0
|
2850 PG_RETURN_POINTER(penalty);
|
|
jbe@0
|
2851 }
|
|
jbe@0
|
2852
|
|
jbe@0
|
2853 /* GiST "picksplit" support function */
|
|
jbe@0
|
2854 PG_FUNCTION_INFO_V1(pgl_gist_picksplit);
|
|
jbe@0
|
2855 Datum pgl_gist_picksplit(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2856 GistEntryVector *entryvec = (GistEntryVector *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2857 GIST_SPLITVEC *v = (GIST_SPLITVEC *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2858 OffsetNumber i; /* between FirstOffsetNumber and entryvec->n (inclusive) */
|
|
jbe@0
|
2859 union {
|
|
jbe@0
|
2860 pgl_pointkey pointkey;
|
|
jbe@0
|
2861 pgl_areakey areakey;
|
|
jbe@0
|
2862 } union_all; /* union of all keys (to be calculated from scratch)
|
|
jbe@0
|
2863 (later cut in half) */
|
|
jbe@0
|
2864 int is_areakey = PGL_KEY_IS_AREAKEY(
|
|
jbe@0
|
2865 (pgl_keyptr)DatumGetPointer(entryvec->vector[FirstOffsetNumber].key)
|
|
jbe@0
|
2866 );
|
|
jbe@0
|
2867 int keysize = is_areakey ? sizeof(pgl_areakey) : sizeof(pgl_pointkey);
|
|
jbe@0
|
2868 pgl_keyptr unionL = palloc(keysize); /* union of keys that go left */
|
|
jbe@0
|
2869 pgl_keyptr unionR = palloc(keysize); /* union of keys that go right */
|
|
jbe@0
|
2870 pgl_keyptr key; /* current key to be processed */
|
|
jbe@0
|
2871 /* allocate memory for array of left and right keys, set counts to zero */
|
|
jbe@0
|
2872 v->spl_left = (OffsetNumber *)palloc(entryvec->n * sizeof(OffsetNumber));
|
|
jbe@0
|
2873 v->spl_nleft = 0;
|
|
jbe@0
|
2874 v->spl_right = (OffsetNumber *)palloc(entryvec->n * sizeof(OffsetNumber));
|
|
jbe@0
|
2875 v->spl_nright = 0;
|
|
jbe@0
|
2876 /* calculate union of all keys from scratch */
|
|
jbe@0
|
2877 memcpy(
|
|
jbe@0
|
2878 (pgl_keyptr)&union_all,
|
|
jbe@0
|
2879 (pgl_keyptr)DatumGetPointer(entryvec->vector[FirstOffsetNumber].key),
|
|
jbe@0
|
2880 keysize
|
|
jbe@0
|
2881 );
|
|
jbe@0
|
2882 for (i=FirstOffsetNumber+1; i<entryvec->n; i=OffsetNumberNext(i)) {
|
|
jbe@0
|
2883 pgl_unite_keys(
|
|
jbe@0
|
2884 (pgl_keyptr)&union_all,
|
|
jbe@0
|
2885 (pgl_keyptr)DatumGetPointer(entryvec->vector[i].key)
|
|
jbe@0
|
2886 );
|
|
jbe@0
|
2887 }
|
|
jbe@0
|
2888 /* check if trivial split is necessary due to exhausted key length */
|
|
jbe@0
|
2889 /* (Note: keys for empty objects must have node depth set to maximum) */
|
|
jbe@0
|
2890 if (PGL_KEY_NODEDEPTH((pgl_keyptr)&union_all) == (
|
|
jbe@0
|
2891 is_areakey ? PGL_AREAKEY_MAXDEPTH : PGL_POINTKEY_MAXDEPTH
|
|
jbe@0
|
2892 )) {
|
|
jbe@0
|
2893 /* half of all keys go left */
|
|
jbe@0
|
2894 for (
|
|
jbe@0
|
2895 i=FirstOffsetNumber;
|
|
jbe@0
|
2896 i<FirstOffsetNumber+(entryvec->n - FirstOffsetNumber)/2;
|
|
jbe@0
|
2897 i=OffsetNumberNext(i)
|
|
jbe@0
|
2898 ) {
|
|
jbe@0
|
2899 /* pointer to current key */
|
|
jbe@0
|
2900 key = (pgl_keyptr)DatumGetPointer(entryvec->vector[i].key);
|
|
jbe@0
|
2901 /* update unionL */
|
|
jbe@0
|
2902 /* check if key is first key that goes left */
|
|
jbe@0
|
2903 if (!v->spl_nleft) {
|
|
jbe@0
|
2904 /* first key that goes left is just copied to unionL */
|
|
jbe@0
|
2905 memcpy(unionL, key, keysize);
|
|
jbe@0
|
2906 } else {
|
|
jbe@0
|
2907 /* unite current value and next key */
|
|
jbe@0
|
2908 pgl_unite_keys(unionL, key);
|
|
jbe@0
|
2909 }
|
|
jbe@0
|
2910 /* append offset number to list of keys that go left */
|
|
jbe@0
|
2911 v->spl_left[v->spl_nleft++] = i;
|
|
jbe@0
|
2912 }
|
|
jbe@0
|
2913 /* other half goes right */
|
|
jbe@0
|
2914 for (
|
|
jbe@0
|
2915 i=FirstOffsetNumber+(entryvec->n - FirstOffsetNumber)/2;
|
|
jbe@0
|
2916 i<entryvec->n;
|
|
jbe@0
|
2917 i=OffsetNumberNext(i)
|
|
jbe@0
|
2918 ) {
|
|
jbe@0
|
2919 /* pointer to current key */
|
|
jbe@0
|
2920 key = (pgl_keyptr)DatumGetPointer(entryvec->vector[i].key);
|
|
jbe@0
|
2921 /* update unionR */
|
|
jbe@0
|
2922 /* check if key is first key that goes right */
|
|
jbe@0
|
2923 if (!v->spl_nright) {
|
|
jbe@0
|
2924 /* first key that goes right is just copied to unionR */
|
|
jbe@0
|
2925 memcpy(unionR, key, keysize);
|
|
jbe@0
|
2926 } else {
|
|
jbe@0
|
2927 /* unite current value and next key */
|
|
jbe@0
|
2928 pgl_unite_keys(unionR, key);
|
|
jbe@0
|
2929 }
|
|
jbe@0
|
2930 /* append offset number to list of keys that go right */
|
|
jbe@0
|
2931 v->spl_right[v->spl_nright++] = i;
|
|
jbe@0
|
2932 }
|
|
jbe@0
|
2933 }
|
|
jbe@0
|
2934 /* otherwise, a non-trivial split is possible */
|
|
jbe@0
|
2935 else {
|
|
jbe@0
|
2936 /* cut covered area in half */
|
|
jbe@0
|
2937 /* (union_all then refers to area of keys that go left) */
|
|
jbe@0
|
2938 /* check if union of all keys covers empty and non-empty objects */
|
|
jbe@0
|
2939 if (PGL_KEY_IS_UNIVERSAL((pgl_keyptr)&union_all)) {
|
|
jbe@0
|
2940 /* if yes, split into empty and non-empty objects */
|
|
jbe@0
|
2941 pgl_key_set_empty((pgl_keyptr)&union_all);
|
|
jbe@0
|
2942 } else {
|
|
jbe@0
|
2943 /* otherwise split by next bit */
|
|
jbe@0
|
2944 ((pgl_keyptr)&union_all)[PGL_KEY_NODEDEPTH_OFFSET]++;
|
|
jbe@0
|
2945 /* NOTE: type bit conserved */
|
|
jbe@0
|
2946 }
|
|
jbe@0
|
2947 /* determine for each key if it goes left or right */
|
|
jbe@0
|
2948 for (i=FirstOffsetNumber; i<entryvec->n; i=OffsetNumberNext(i)) {
|
|
jbe@0
|
2949 /* pointer to current key */
|
|
jbe@0
|
2950 key = (pgl_keyptr)DatumGetPointer(entryvec->vector[i].key);
|
|
jbe@0
|
2951 /* keys within one half of the area go left */
|
|
jbe@0
|
2952 if (pgl_keys_overlap((pgl_keyptr)&union_all, key)) {
|
|
jbe@0
|
2953 /* update unionL */
|
|
jbe@0
|
2954 /* check if key is first key that goes left */
|
|
jbe@0
|
2955 if (!v->spl_nleft) {
|
|
jbe@0
|
2956 /* first key that goes left is just copied to unionL */
|
|
jbe@0
|
2957 memcpy(unionL, key, keysize);
|
|
jbe@0
|
2958 } else {
|
|
jbe@0
|
2959 /* unite current value of unionL and processed key */
|
|
jbe@0
|
2960 pgl_unite_keys(unionL, key);
|
|
jbe@0
|
2961 }
|
|
jbe@0
|
2962 /* append offset number to list of keys that go left */
|
|
jbe@0
|
2963 v->spl_left[v->spl_nleft++] = i;
|
|
jbe@0
|
2964 }
|
|
jbe@0
|
2965 /* the other keys go right */
|
|
jbe@0
|
2966 else {
|
|
jbe@0
|
2967 /* update unionR */
|
|
jbe@0
|
2968 /* check if key is first key that goes right */
|
|
jbe@0
|
2969 if (!v->spl_nright) {
|
|
jbe@0
|
2970 /* first key that goes right is just copied to unionR */
|
|
jbe@0
|
2971 memcpy(unionR, key, keysize);
|
|
jbe@0
|
2972 } else {
|
|
jbe@0
|
2973 /* unite current value of unionR and processed key */
|
|
jbe@0
|
2974 pgl_unite_keys(unionR, key);
|
|
jbe@0
|
2975 }
|
|
jbe@0
|
2976 /* append offset number to list of keys that go right */
|
|
jbe@0
|
2977 v->spl_right[v->spl_nright++] = i;
|
|
jbe@0
|
2978 }
|
|
jbe@0
|
2979 }
|
|
jbe@0
|
2980 }
|
|
jbe@0
|
2981 /* store unions in return value */
|
|
jbe@0
|
2982 v->spl_ldatum = PointerGetDatum(unionL);
|
|
jbe@0
|
2983 v->spl_rdatum = PointerGetDatum(unionR);
|
|
jbe@0
|
2984 /* return all results */
|
|
jbe@0
|
2985 PG_RETURN_POINTER(v);
|
|
jbe@0
|
2986 }
|
|
jbe@0
|
2987
|
|
jbe@0
|
2988 /* GiST "same"/"equal" support function */
|
|
jbe@0
|
2989 PG_FUNCTION_INFO_V1(pgl_gist_same);
|
|
jbe@0
|
2990 Datum pgl_gist_same(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
2991 pgl_keyptr key1 = (pgl_keyptr)PG_GETARG_POINTER(0);
|
|
jbe@0
|
2992 pgl_keyptr key2 = (pgl_keyptr)PG_GETARG_POINTER(1);
|
|
jbe@0
|
2993 bool *boolptr = (bool *)PG_GETARG_POINTER(2);
|
|
jbe@0
|
2994 /* two keys are equal if they are binary equal */
|
|
jbe@0
|
2995 /* (return result by setting referenced boolean and returning pointer) */
|
|
jbe@0
|
2996 *boolptr = !memcmp(
|
|
jbe@0
|
2997 key1,
|
|
jbe@0
|
2998 key2,
|
|
jbe@0
|
2999 PGL_KEY_IS_AREAKEY(key1) ? sizeof(pgl_areakey) : sizeof(pgl_pointkey)
|
|
jbe@0
|
3000 );
|
|
jbe@0
|
3001 PG_RETURN_POINTER(boolptr);
|
|
jbe@0
|
3002 }
|
|
jbe@0
|
3003
|
|
jbe@0
|
3004 /* GiST "distance" support function */
|
|
jbe@0
|
3005 PG_FUNCTION_INFO_V1(pgl_gist_distance);
|
|
jbe@0
|
3006 Datum pgl_gist_distance(PG_FUNCTION_ARGS) {
|
|
jbe@0
|
3007 GISTENTRY *entry = (GISTENTRY *)PG_GETARG_POINTER(0);
|
|
jbe@0
|
3008 pgl_keyptr key = (pgl_keyptr)DatumGetPointer(entry->key);
|
|
jbe@0
|
3009 StrategyNumber strategy = (StrategyNumber)PG_GETARG_UINT16(2);
|
|
jbe@0
|
3010 bool *recheck = (bool *)PG_GETARG_POINTER(4);
|
|
jbe@0
|
3011 double distance; /* return value */
|
|
jbe@0
|
3012 /* demand recheck because distance is just an estimation */
|
|
jbe@0
|
3013 /* (real distance may be bigger) */
|
|
jbe@0
|
3014 *recheck = true;
|
|
jbe@10
|
3015 /* strategy number aliases for different operators using the same strategy */
|
|
jbe@10
|
3016 strategy %= 100;
|
|
jbe@0
|
3017 /* strategy number 31: distance to point */
|
|
jbe@0
|
3018 if (strategy == 31) {
|
|
jbe@0
|
3019 /* query datum is a point */
|
|
jbe@0
|
3020 pgl_point *query = (pgl_point *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
3021 /* use pgl_estimate_pointkey_distance() function to compute result */
|
|
jbe@0
|
3022 distance = pgl_estimate_key_distance(key, query);
|
|
jbe@0
|
3023 /* avoid infinity (reserved!) */
|
|
jbe@0
|
3024 if (!isfinite(distance)) distance = PGL_ULTRA_DISTANCE;
|
|
jbe@0
|
3025 /* return result */
|
|
jbe@0
|
3026 PG_RETURN_FLOAT8(distance);
|
|
jbe@0
|
3027 }
|
|
jbe@0
|
3028 /* strategy number 33: distance to circle */
|
|
jbe@0
|
3029 if (strategy == 33) {
|
|
jbe@0
|
3030 /* query datum is a circle */
|
|
jbe@0
|
3031 pgl_circle *query = (pgl_circle *)PG_GETARG_POINTER(1);
|
|
jbe@0
|
3032 /* estimate distance to circle center and substract circle radius */
|
|
jbe@0
|
3033 distance = (
|
|
jbe@0
|
3034 pgl_estimate_key_distance(key, &(query->center)) - query->radius
|
|
jbe@0
|
3035 );
|
|
jbe@0
|
3036 /* convert non-positive values to zero and avoid infinity (reserved!) */
|
|
jbe@0
|
3037 if (distance <= 0) distance = 0;
|
|
jbe@0
|
3038 else if (!isfinite(distance)) distance = PGL_ULTRA_DISTANCE;
|
|
jbe@0
|
3039 /* return result */
|
|
jbe@0
|
3040 PG_RETURN_FLOAT8(distance);
|
|
jbe@0
|
3041 }
|
|
jbe@0
|
3042 /* strategy number 34: distance to cluster */
|
|
jbe@0
|
3043 if (strategy == 34) {
|
|
jbe@0
|
3044 /* query datum is a cluster */
|
|
jbe@0
|
3045 pgl_cluster *query = (pgl_cluster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
|
|
jbe@0
|
3046 /* estimate distance to bounding center and substract bounding radius */
|
|
jbe@0
|
3047 distance = (
|
|
jbe@0
|
3048 pgl_estimate_key_distance(key, &(query->bounding.center)) -
|
|
jbe@0
|
3049 query->bounding.radius
|
|
jbe@0
|
3050 );
|
|
jbe@0
|
3051 /* convert non-positive values to zero and avoid infinity (reserved!) */
|
|
jbe@0
|
3052 if (distance <= 0) distance = 0;
|
|
jbe@0
|
3053 else if (!isfinite(distance)) distance = PGL_ULTRA_DISTANCE;
|
|
jbe@0
|
3054 /* free detoasted cluster (if copy) */
|
|
jbe@0
|
3055 PG_FREE_IF_COPY(query, 1);
|
|
jbe@0
|
3056 /* return result */
|
|
jbe@0
|
3057 PG_RETURN_FLOAT8(distance);
|
|
jbe@0
|
3058 }
|
|
jbe@0
|
3059 /* throw error for any unknown strategy number */
|
|
jbe@0
|
3060 elog(ERROR, "unrecognized strategy number: %d", strategy);
|
|
jbe@0
|
3061 }
|
|
jbe@0
|
3062
|