[Qgis-developer] Re: classification of rasters

[Marco Hugentobler]

Hi Tim,

I commited a first attempt for raster classification to the transparency 
branch. The colormap entries are stored in 
QgsRasterLayer::mValueClassification and are drawn in 
QgsRasterLayer::drawSingleBandPseudoColor.

There is a new tab 'colormap' in the raster properties dialog now. 
Custom classification currently only kicks in if pseudo color mode is active. 
Should the colormap dialog be disabled if this is not the  case?

Regards,
Marco



Am Samstag, 10. März 2007 11:44 schrieb Tim Sutton:
> Hi Marco
>
> Sounds cool! I'm also in favour of a new tab since I dont like lots of
> pop up windows ala arcmap.
>
> Regards
>
> Tim
>
> 2007/3/10, Marco Hugentobler <marco.hugentobler at karto.baug.ethz.ch>:
> > Hi Tim,
> >
> > I did some experiments with classifications by evaluating value against a
> > set of classes. It slows down rendering a bit, but speed seems still
> > acceptable for a first version. I may return and try to enhance speed
> > with color tables later.
> >
> > I'm trying to program a GUI for the classification now. I see two
> > possibilities:
> >
> > A new tab called 'custom color map' in the raster layer properties,
> > containing the GUI elements to create a classification.
> >
> > A button 'custom color map...' under the color map combo box. This would
> > pop up the dialog for creating the classification.
> >
> > I'm more in favour of the first one, as it allows users to immediatly try
> > out the symbology by pressing 'apply'. What do you think?
> >
> >
> > Regards,
> > Marco