[Qgis-developer] How can I program a raster legend using PyQGIS?

Martin Dobias wonder.sk at gmail.com
Wed Jan 16 09:31:33 EST 2008

On Jan 16, 2008 3:14 PM, René Estrella <perro1255 at hotmail.com> wrote:
> >Hi,
> >I don't get what you mean by "raster layer component"...
> Hi, Martin.  Thanks so much for your answer.  There's an error in my last
> post.  I need to develop a raster LEGEND component, not a raster layer
> component.

Ah ok, now I got it :-)

>  What I particularly need is to
> display several Ascii Grid Rasters in the map canvas of QGIS, and, attached
> to it a legend component showing the list of layers loaded and for each
> layer the symbology indicating the colors corresponding to each pixel value
> of the raster layer.  I mean, something similar to the vector layer legend,
> where you can categorize the information and assign a color for each
> category, and things like those.  It seems it's not possible to obtain such
> a legend for an ascii grid raster layer with the current functionality
> included in QGIS.  Because of that, I think the only way to do that is to
> develop a plugin for producing the legend.  Am I right or there is something
> more I should know about this topic?  Could you give me some guidance to
> start developing such a component?

Sorry I can't give you more guidance since I'm not much an expert to
rasters. Maybe some of our raster experts could give you some hints...


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