On 21.09.2008, at 15:28, imacarthur wrote:

> ... but if I "adjust" the fltk context at all, after obtaining the  
> Cairo
> context, then the Cairo context will be messed up...
> That effect seemed odd to me, and therefore worthy of comment.


Well, "adjusting" the contet in this case flips from Quartz to FLTK  
coordinate system. Now I assume that Cairo expects the Quartz context  
and flips it. Flipping it twice of course gets the original context  
back, and all drawing is upsidedown... . Cairo probably shoudl *set*  
the matrix to whatever is need, but instead seems to multiply the  
flipped matrix.

----
http://robowerk.com/


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