[cairo] in_fill hit test and matrix transforms

Behdad Esfahbod behdad at behdad.org
Wed Nov 21 20:33:35 PST 2007


On Wed, 2007-11-21 at 11:46 -0500, Donn wrote:
> 
>     def button_press(self,widget,event):
>         cr = self.cr
>         #Exact same matrix, no effect
>         self.matrixstart ( cr )    
>         self.cairocommands ( cr )
>         result = cr.in_fill( event.x, event.y )
>         print result
>         self.matrixend ( cr )

Just move the matrixend call before the in_fill call.  Note that in_fill
transforms your event x,y according to the current transform matrix
(ctm) too.  So, you need to get to an identity ctm before doing it for
your use case.
         
-- 
behdad
http://behdad.org/

"Those who would give up Essential Liberty to purchase a little
 Temporary Safety, deserve neither Liberty nor Safety."
        -- Benjamin Franklin, 1759





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