[wxPython-users] Re: Trouble with drawing, I need some ideas :)

[Peter Damoc]

Problem solved via:

def SetAlpha(bmp):
    w, h =3D bmp.GetSize()
    img =3D bmp.ConvertToImage()
    img.InitAlpha()
    for i in range(w):
        for j in range(h):
            img.SetAlpha(i,j, 0)
    return img.ConvertToBitmap()

Ugly hack but... until I find something better.... :) will have to do...

Peter

On 10/1/07, Peter Damoc <pdamoc at gmail.com> wrote:
>
> Hi Robin,
> First, let me apologize for not being clear again. :)
>
> I appreciate the advice you gave BUT it is not touching the real issue.
> The sample created was just some boiler plate for people to play with. It
> was not "efficient".
> I can do all the buffering that could be done BUT my main issue remains
> the same:
>
> How do I use alpha in a buffer that need to be blited over some other
> drawing? Color based transparency won't do because of the wxGCDC used in =
the
> buffer.
>
> Here... take a look at this kind of desperate code:
>
>         cache =3D wx.MemoryDC(wx.EmptyBitmap(w,h))
>         cache.SetBackground(wx.TRANSPARENT_BRUSH)
>         cache.SetBackgroundMode(wx.TRANSPARENT )
>         cache.Clear()
>         gc_cache  =3D wx.GCDC(cache)
>         gc_cache.SetBackground(wx.TRANSPARENT_BRUSH)
>         gc_cache.SetBackgroundMode(wx.TRANSPARENT)
>         gc_cache.Clear()
>
> Maybe it expresses what I'm trying to accomplish.
>
> Peter.
> --
> There is NO FATE, we are the creators.
>



-- =

There is NO FATE, we are the creators.
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