[Qgis-developer] How to load a colour table on a raster, programmatically (in python)?

[Martin Dobias]

On Mon, Aug 9, 2010 at 11:01 PM, Benoit de Cabissole <benoit at exigesa.com> wrote:
> Colormap is given to the raster (and into the coloramp tab in the raster
> properties). The colour ramp attribute is also reflected in the symbology
> tab: color map combobox set to colormap. So the raster is given the correct
> info. So far so good. But, the legend does not refresh to show the change to
> colormap: the raster icon and raster colour bar stay grey.

Use QgsLegendInterface class to refresh the symbology:

iface.legendInterface().refreshLayerSymbology(layer)


> The main raster (the only layer in my test) does not refresh either in the
> QGIS map canvas window. Only if I move it will it refresh and display the
> colour map.

Possibly you're using caching. Make sure to clear the cached image
before calling triggerRepaint():

layer.setCacheImage(None)

> The only way to refresh the legend to the correct info seems to open the
> raster properties box and click ok. (I've tried the QgsLegendInterface, but
> I have problems to make it work!)

What probles with QgsLegendInterface did you have?


Regards
Martin