I am trying to create zoomable goocanvas, which zooms towards the current 
pointer position instead of the center of the visible part of the goocanvas. 
Unfortunately my correction offset seems to be correct mathematically but does 
not work if I implement it.

As the implementation spans some lines of C-code, I created a structured 
question at stackoverflow 
http://stackoverflow.com/questions/15212219/goocanvas-coordinate-systems-and-zooming
I hope this kind of pointer is acceptable for this mailinglist.

Thanks for your time, I'd appreciate any kind of tip or pointer.

Best regards,

Bernhard
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