[Gdal-dev] ogrlayer GetExtent implemented yet?

[Frank Warmerdam]

Tyler Mitchell wrote:
> 
> 
> 
> In the ogr.py that I've got, I see that layer.GetExtent() says "not
> implemented yet".  Is there an alternative already available for extents on
> layers or does it just mean I need to do a bit more work?

Tyler,

I have just implemented the GetExtent() method for the Python OGR wrapper.  It
is now in CVS.  You can just copy this in place of the existing GetExtent()
in ogr.py:

     def GetExtent( self, force = 1 ):
         extents = _gdal.ptrcreate( 'double', '', 4 )
         res = _gdal.OGR_L_GetExtent( self._o,
                   _gdal.ptrcast(extents,'OGREnvelope_p'), force )
         if res != 0:
             ret_extents = None
         else:
             ret_extents = ( _gdal.ptrvalue( extents, 0 ),
                             _gdal.ptrvalue( extents, 1 ),
                             _gdal.ptrvalue( extents, 2 ),
                             _gdal.ptrvalue( extents, 3 ) )
         _gdal.ptrfree( extents )

         return ret_extents


Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent