1

2 CREATE OR REPLACE FUNCTION tmp_three_points()

3 RETURNS epoint[]

4 LANGUAGE plpgsql VOLATILE AS $$

5 DECLARE

6 p1 epoint;

7 p2 epoint;

8 p3 epoint;

9 BEGIN

10 p1 := epoint((asin(2*random()-1) / pi()) * 180, (2*random()-1) * 180);

11 p2 := epoint(latitude(p1) + (2*random()-1), longitude(p1) + cos(latitude(p1)/180*pi()) * (2*random()-1));

12 p3 := epoint(latitude(p1) + (2*random()-1), longitude(p1) + cos(latitude(p1)/180*pi()) * (2*random()-1));

13 RETURN ARRAY[p1, p2, p3];

14 END;

15 $$;

16

17 INSERT INTO "test" ("location", "surrounding", "multipoint", "triangle") SELECT

18 epoint((asin(2*random()-1) / pi()) * 180, (2*random()-1) * 180),

19 ecircle((asin(2*random()-1) / pi()) * 180, (2*random()-1) * 180, -ln(1-random()) * 1000),

20 ecluster_create_multipoint(tmp_three_points()),

21 ecluster_create_polygon(tmp_three_points())

22 FROM generate_series(1, 10000);

23

24 DROP FUNCTION tmp_three_points();