[Gdal-dev] OGRGeometry::Distance

[Howard Butler]

Matthew,

It is just an oversight that the Python OGR.Geometry.Distance 
function is not implemented in ogr.py.  It *is* in the wrapper 
though.  Here is what I do to get a Distance function.  I usually put 
it after all of my imports at the top.

try:
     ogr.Geometry.Distance
except AttributeError:
     def Distance(self, other):
         dist = _gdal.OGR_G_Distance(self._o, other._o);
         return dist
     ogr.Geometry.Distance = Distance


Howard


At 10:50 PM -0700 9/17/05, Matthew Perry wrote:
>Hi folks,
>
>   I'm new to the list so I'll just introduce myself real quick. I've 
>been doing GIS and cartography for 4 years at Humboldt State 
>University as a Natural Resources major and, although it's not my 
>background per se, I've been getting heavily into programming these 
>past few months. Most of my web mapping stuff is PHP/Mapscript but 
>I've begun really like python/OGR/GDAL for doing my data processing.
>
>   Anyways, I've run into a bit of an issue with the 
>OGRGeometry::Distance method. Check out the following script:
>
>     import ogr
>     # Create some test geometries
>     wkt = 'POINT(1 1)'
>     g1 = ogr.CreateGeometryFromWkt(wkt)
>     wkt = 'POINT(2 1)'
>     g2 = ogr.CreateGeometryFromWkt(wkt)
>
>     b = g1.Buffer(2)
>     # Works fine so we know geos is enabled
>
>     d = g1.Distance(g2)
>     # fails ... "Attribute Error: Geometry instance has no attribute 
>'Distance'"
>
>According to the docs at 
><http://gdal.maptools.org/ogr/classOGRGeometry.html>http://gdal.maptools.org/ogr/classOGRGeometry.html 
>this should work, right? Or have there been recent changes that 
>break this method? Are there any updated docs anywhere? I'm using 
>gdal 1.3.0 packaged with FWTools 0.9.9 on ubuntu linux.
>
>Thanks for helping me out.
>
>--
>Matt Perry
><mailto:perrygeo at gmail.com>perrygeo at gmail.com
><http://www.perrygeo.net>http://www.perrygeo.net
>
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