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06:05:16 <nikq> Mapnik Trac: MetaWriter edited | http://trac.mapnik.org/wiki/MetaWriter?version=15
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15:53:00 <nikq> Mapnik Trac: Changeset [2185]: create a branch for testing code paths for allowing the sharing of a  ... | http://trac.mapnik.org/changeset/2185
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16:28:48 <johto> I have a question about the python interface: does mapnik.render() overwrite the existing image or should I do something to it?
16:28:59 <johto> mapnik.render(map, image) that is
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17:26:41 <jburgess_> johto: If I remember correctly, the step of rendering is to fill the image with the map 'bgcolor'. If you want to avoid this you can avoid specifying the bgcolor and it should then render on top of whatever is already in the image buffer.
17:27:06 <johto> no, I specifically want it to render a fresh image
17:28:03 <johto> I tried looking at the code, but I couldn't find the top-level functions in the python bindings
17:28:11 <johto> guess I should actually pull the code and grep ;-)
17:29:06 <jburgess_> then, yes, just call render again and you should get a new image. There is no need to explicitly clear the image between render calls
17:29:32 <johto> okay. thanks
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