Transparent Pixmap Background in MapScript

[Sean Gillies]

On Nov 21, 2005, at 7:53 PM, Fawcett, David wrote:

> I know that I have seen the proper code before, but my search hasn't =
> been able to relocate it. =20
>
> In python mapscript, I am creating a pixmap symbol from a gif.  I am =
> building everything without a map file.  Everything works, but I  
> end up =
> getting a black background on my transparent gif symbol. =20
>
> I am pretty sure that I need to set a color or background color, but =
> can't get it quite right. =20
>
> Here is what I am trying:=20
>
> # add the image symbol we defined above to the inline layer
> cls =3D mapscript.classObj(inline_layer)
> cls.name=3D'classname'
> style =3D mapscript.styleObj(cls)
> style.symbol =3D mymap.symbolset.index('from_img')
> style.backgroundcolor.setRGB(-1, -1, -1)
> style.color.setRGB(-1, -1, -1)
>
>
> Thanks,=20
>
> David.

If your GIF is properly transparent, all you have to do is set the  
transparency property of your layer

   layer.transparency = mapscript.MS_GD_ALPHA

cheers,
Sean

---
Sean Gillies
sgillies at frii dot com
http://zcologia.com/news