Having finally got around to doing some more work on SharpMap.Wpf I have at last managed to implement generic versions of both the LabelLayer and GdalRasterLayer. As with VectorLayer, a large body of the code is the same as the GDI+ specific versions however they both derive from the new SharpMap.Wpf.Layers.Layer base class which uses an IRenderContext in its overridable Render method instead of a GDI+ graphics object.
There are still a few minor issues to iron out. I haven't gotten around to supporting label rotation yet (although this should not be very difficult) and GdalRasterLayer does not yet do anything with the TransparentColor property. Still, nearly there! Just need a better demo project now.
Some screenshots below:
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