[Qgis-developer] error for QGIS tutorials in python - adding rasters to canvas

Tim Sutton tim at linfiniti.com
Thu Jan 24 06:55:29 EST 2008


Yes the raster API is changed. I dont know the python stuff so well
but in the case of C++  you would do something like this:

117 	   mpRasterLayer->setDrawingStyle(QgsRasterLayer::SINGLE_BAND_PSEUDO_COLOR);
118 	   mpRasterLayer->setColorShadingAlgorithm(QgsRasterLayer::PSEUDO_COLOR);
119 	   mpRasterLayer->setContrastEnhancementAlgorithm(
120 	          QgsContrastEnhancement::STRETCH_TO_MINMAX, false);

You will need to translate that to python api but it should be quite
similar. Take a look at
for the different drawing styles and shading algorithms you can use.



2008/1/23, Martin Dobias <wonder.sk at gmail.com>:
> 2008/1/23 volkan kepoglu <vkepoglu at gmail.com>:
> > downloaded QGIS tutorials in python, changed qgis_prefix and runned
> > 2_basic_main_window and 3_basic_labelling successfully,
> > but 4_adding_rasters_to_canvas gives the following error;
> >
> > vkepoglu at vkepoglu:~/qgis/tutorials/4_adding_rasters_to_canvas$ python
> > mainwindow.py
> > Traceback (most recent call last):
> >   File " mainwindow.py", line 76, in addLayer
> >     layer.setColorRampingType(QgsRasterLayer.BLUE_GREEN_RED)
> > AttributeError: setColorRampingType
> Ah, that will be caused by the recent refactoring of the raster classes.
> Peter / Tim - can you suggest how to change the code to make it working again?
> > how can ı fix?
> > or the most important than to fix this,
> > how can ı learn to qgis bindings to python.
> >
> > where should ı look for reference of python bindings
> >
> > http://wiki.qgis.org/qgiswiki/PythonBindings, is there any other references?
> Today I've updated PythonBindings wiki page with some resources
> (listed in top part in Using PyQGIS section). Basically it's good to
> look at QGIS C++ API reference, QGIS blog, tutorials ported to Python
> and QGIS plugins that have been done already. (all links listed there)
> Martin
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Tim Sutton
QGIS Project Steering Committee Member - Release  Manager
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