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polygon-property-functions

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User Comments
  Posted by on November 12, 2006
there are more than just these functions available. I think this not clear enough in the docs.
for example, the MultiPolygon 'Centroid' function works for Polygons as well.
example:

mysql> SET @poly = 'Polygon((0 0,0 3,3 3,3 0,0 0))';

mysql> select astext( Centroid(PolygonFromText(@poly)));
+-------------------------------------------+
| astext( Centroid(PolygonFromText(@poly))) |
+-------------------------------------------+
| POINT(1.5 1.5) |
+-------------------------------------------+
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