[SciPy-user] Pyglet + Chaco (was Re: pyqwt or matplotlib)

Peter Wang pwang@enthought....
Thu Aug 28 18:25:40 CDT 2008

On Aug 28, 2008, at 4:49 PM, Bryan Cole wrote:

> The GL backend for Chaco is an exciting development. Althought the
> examples worked fine with the pyglet backend, when I tried to  
> experiment
> with it I couldn't see how to use it within the context of a full
> TraitsUI/wx application. Pyglet doesn't seem to integrate with any  
> other
> toolkit event loop.

Yep, there be the dragons.  I started working on this late Tuesday  
night but haven't finished it yet.  It is certainly possible to do,  
it's just that my test code is still doing funky things. :)  The goal  
that Stefan and I were talking about is to embed a Pyglet-based  
CoverFlow into a Traits UI editor.  (My personal goal is to then stick  
live Chaco plots on the CoverFlow covers. ;)

> Can the gl_graphics_context be "dropped in" in place of the standard  
> agg
> gc? Is there an easy switch to set this up?

You can set the KIVA_WISHLIST environment variable to "gl", and then  
subsequent imports of GraphicsContext from enthought.kiva will use the  
GC from backend_gl.py.  This doesn't get you nice event handling  
through Enable, but it does work.

You can also directly import the graphics context and play with it:

from enthought.kiva.backend_gl import GraphicsContext
from enthought.kiva import Font
from pyglet import clock, window

def main():

     win = window.Window()
     win.set_size(480, 320)
     win.set_caption("Backend GL + Pyglet")

     gc = GraphicsContext((480, 320))

     exit = False
     while not exit:

         gc.set_stroke_color((1, 0, 0, 1))
         gc.rect(100, 100, 200, 75)

         font = Font("Arial", 48)
         gc.show_text_at_point("Kiva GL!", 110, 110)

         if win.has_exit:
             exit = True

if __name__ == "__main__":


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