Drawing line with XOR



Hello all,

I'm having trouble with drawing a line on different colored background.

For example, when my rubber-banding line is in a black rectangle, the color
of the line is shown as green. When my line is in a white rectangle, the
color of the line is shown as purple.

I've been looking at Xlib, gtk, gtkmm examples on colormap, overlay, etc.
but I can't find a solution.
I attached an example program to illustrate the problem.

What I want is a solid color line, such as green.
Can someone offer any suggestion?

Thanks so much,
Andy

Attachment: overlay.cc
Description: Binary data



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