Question about alpha blending and low level drawing on widgets
jdhunter at ace.bsd.uchicago.edu
Tue Jun 29 05:34:25 CEST 2004
>>>>> "Gabriele" == Gabriele Farina *DarkBard* <Gabriele> writes:
Gabriele> So I thought other ways: 1) using PyOpengl (tha supports
Gabriele> alpha whe drawing primitives, supports very well zooming
Gabriele> and gradient filling), but I think it is not a good
Gabriele> choice because of some problems related to videocards
Gabriele> ... 2) Use TK Canvas, but I think it does not
Gabriele> understand alpha (am I right??) .. 3) Use QT, but I
Gabriele> need a multiplatform application, and under windows QT
Gabriele> are not totally free ...
matplotlib - http://matplotlib.sf.net - has a tkagg backend. This
uses the antigrain graphics library (alpha, antialiasing, etc)
rendered on a tk canvas. So even though tk may not support alpha, all
of the alpha blending is done in the front end by matplotlib +
antigrain, and the result is transferred onto the tk canvas. This is
not mind numbingly fast, but may be fast enough for your purposes.
The src distribution (*.tar.gz or *.zip) comes with an example showing
how to embed matplotlib in a tk application; see
matplotlib/tkagg has been tested under windows, linux, mac os X and
other unix platforms, and is distributed under a PSF style license.
Hope this helps,
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