[wxpython-users] Re: transparent bitmap on bitmap

[Christopher Barker]

Paul Sijben wrote:
> Now I have one little issue left over ; I want the aggregate bitmap with 
> the code below. However I want the aggregate to be transparent, now the 
> edge is ragged in the CYAN color I am trying to use to make the thing 
> transparent. Is there a way to gain transparency and smooth edges?

You might try using a bitmap with an alpha channel:

                 bitmap=wx.EmptyBitmap(w,h, depth=32)
...
                 scratch.SetBackground(wx.TRANSPARENT_BRUSH)
                 scratch.Clear()

untested...

wx.TRANSPARENT_BRUSH may not work right, you may need:

SetBackground(wx.Brush(wx.Color(0,0,0,0)))

-Chris

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Christopher Barker, Ph.D.
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