[Qgis-developer] Re: Colormap
ersts at amnh.org
Wed Aug 12 11:33:50 EDT 2009
Glad you found a solution. This highlights something of a problem that
has come up before in the raster class itself, it has to do with the cast
QgsColorRampShader* myRasterShaderFunction = (
and the need to get to methods specific to the shader. In this case the
cast will work even if the current shader function is not a color ramp
shader, but of course when you go to use it as a color ramp shader,
crash. I think the solution is to use dynamic_cast then check to make
sure the pointer is not null.
I think it also might be useful if the shaders had ids or names as
another way of knowing what type of shader you currently have. If you
think this would be helpful, feel free to file a ticket so that it can
be added to the growing todo list.
sergio cavalcante wrote:
> Hey guys,
> I've solved the problem.
> It was just use the function :
> at the end of the applypalette() , and and create the
> myRasterShaderFunction this way:
> QgsColorRampShader* myRasterShaderFunction = new
> instead of this way:
> QgsRasterLayer * mypLayer = new
Peter J. Ersts, Software Developer
American Museum of Natural History
Center for Biodiversity and Conservation
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New York, New York 10024
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Quantum GIS Raster Development Team.
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