[postgis-users] Function for creating TIN using tripack fortran codes(Adding convex hull)

[Hisaji ONO]

Hello.

 I added  Convex Hull function(result will be POLYGON) into my "tin.c"
codes.

 Comiling is in same manner as former one.

 And create chull (convex hull) function like this.

CREATE FUNCTION chull(GEOMETRY)
  RETURNS GEOMETRY
  AS 'C:/cygwin/usr/src/postgresql-7.2.1/contrib/postgis-0.7.1/postgis.dll',
'create_chull'
  LANGUAGE 'c'  with (isstrict);

You can use this function like this.

   select chull(collect(the_geom)) from point_table;

 However, I know JTS supports Convex Hull.

 Regards.
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