On Sep 24, 2009, at 7:10 PM, pbuck wrote:

> Assume two overlapping polygons, one red, one blue. Where they
> intersect/overlap is purple.

This assumption is what's causing your problem. Where they overlap is  
not considered purple when clipping the mouse coordinates against the  
polygon. For that purpose, where they overlap is either red or blue  
depending on which has a higher z-index. Try reversing the order you  
draw the shapes in and you will find you get exactly the opposite  
behavior to what you described.

Long story short: mouseover ignores opacity.

-G

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