[Qgis-developer] Raster Transparency

[Tim Sutton]

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Hi



sergio cavalcante wrote:
> People, can anyone give me a little help with my transparency function?
> Here is it:
> 
> void CViewPort::SetRasterTransparent(QgsRasterLayer * mRasterLayer)
> 
> {
> 
>   double myTransparentValue;
> 
>   double myPercentTransparent;
> 
> 
>   QgsRasterTransparency::TransparentSingleValuePixel myTransparentPixel;
> 
>   QList<QgsRasterTransparency::TransparentSingleValuePixel>
> myTransparentSingleValuePixelList;
> 
> 
>   myTransparentPixel.pixelValue = 0.00;
> 
>   myTransparentPixel.percentTransparent = 100.00;
> 
>   myTransparentSingleValuePixelList.append( myTransparentPixel );
> 
> 
>   myTransparentPixel.pixelValue = 65.00;
> 
>   myTransparentPixel.percentTransparent = 100.00;
> 
>   myTransparentSingleValuePixelList.append( myTransparentPixel );
> 
> 
>   mRasterLayer->rasterTransparency()->setTransparentSingleValuePixelList(
> myTransparentSingleValuePixelList );
> 
> }
> 
> The pixels I need to become transparent are the 0 and 65. I put the same
> values on the quantum gis application transparent pixel list and they become
> transparent, but I couldn't get the same result in my app.

Does calling:

 mRasterLayer->triggerRepaint();

at the end make any difference?

Regards

- --

Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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