[mapguide-users] Wish List

[Jason Birch]

Kori wrote:
 >  Dim l_dArea as double = l_oMgPolygon.Area

 

As Kori mentioned, you could do this pretty easily without a feature
source:

 

$wktReaderWriter = new MgWktReaderWriter();
$poly = $wktReaderWriter->Read(
   "POLYGON ( ( 1 1 , 1 2 , 2 1 , 1 1 ) )");
print $poly->GetArea();


Note that this doesn't give meaningful results for non-projected
coordinate systems.  To do this properly, you'd likely want to project
into an appropriate system (UTM is fairly easy to determine
programmatically) and run the area calculation on the projected
geometry.  There would also need to be some unit handling/conversion
stuff in place for a generic tool, as well as checks to make sure you
have a valid polygon, etc.

 

Jason

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