Martin, Solved GDAL 1.7 access on OSGeo4W thanks to Duarte and started again to test thanks to the latest release (r14026) but still unable to produce the colormap!
Here is the code I'm using: # tell the layer to use a QgsColorRampShader function theLayer.setColorShadingAlgorithm( QgsRasterLayer.ColorRampShader ) theLayer.rasterShader().setRasterShaderFunction( QgsColorRampShader() ) # get the raster shader function: should be a QgsColorRampShader myColorRampShader = theLayer.rasterShader().rasterShaderFunction() # set parameter for the QgsColorRampShader function myColorRampShader.setColorRampItemList( theTBL ) myColorRampShader.setMaximumColorCacheSize( nColo ) myColorRampShader.setColorRampType( myColorRampShader.DISCRETE ) # feed my custom QgsColorRampShader back to the raster theLayer.setRasterShaderFunction( myColorRampShader ) It does not produce an error but raster does not change to the given colormap. Furthermore on quitting QGIS it bombs out (access violation, from debug). Do you have an idea of what I'm doing wrong? I've tried to base the code on the 'Apply' C++ code on the qgsrasterlayerproperties.cpp file. The original code below produced an "Access violation - no RTTI data" error without doing anything. Do you know the meaning of that error? Is there a wiki of the meaning of all errors in QGIS? Thanks all for your help, Benoit > -----Original Message----- > From: Martin Dobias [mailto:wonder...@gmail.com] > Sent: Saturday, 07 August 2010 17:10 > To: ben...@exigesa.com > Cc: qgis-developer@lists.osgeo.org > Subject: Re: [Qgis-developer] How to load a colour table on a raster, > programmatically (in python)? > > > On Fri, Aug 6, 2010 at 2:43 PM, Benoit de Cabissole > <ben...@exigesa.com> wrote: > > I've tried many combinations around the following code: > >. > > [...] > > 129 theLayer.rasterShader().setRasterShaderFunction( > > QgsColorRampShader() ) > > 130 theLayer.setRasterShaderFunction( QgsColorRampShader() ) > > 131 myColorRampShader = QgsColorRampShader() > > 132 myColorRampShader.setColorRampItemList( theTBL ) > > 133 myColorRampShader.setMaximumColorCacheSize( nColo ) > > 134 myColorRampShader.setColorRampType( myColorRampShader.DISCRETE ) > > 135 theLayer.rasterShader().setRasterShaderFunction( > myColorRampShader ) > > 136 theLayer.setRasterShaderFunction( myColorRampShader ) > > Hi Benoit, > > I've took a look at the problem at it turned out there were actually > two problems with python wrappers. I've fixed that in svn - r14022. > From that revision, things should werk correctly. You should be able > to either: > - create an instance of shader function and assign it to raster layer > without a crash > - retrieve current raster shader function and modify it (previously > always the base class QgsRasterShaderFunction was returned) > > Regards > Martin _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
