🚀 go-pugleaf

In article <9301082259.AA16974@questercorp> stephen@tangent1.UUCP (Stephen McKay) writes:

	   I have created a DrawArea widget under motif and have colored the foreground of this region using Xcolor "DeepSkyBlue".

	   The problem comes when I want to select the foreground color to use with rubberbanding. ie. a rectangle.  What is the method fo selecting a foreground (x) color that when used with Xor, displays the desired color (y)?

	   Note: If the DrawArea is XFillRectangle with "DeepSkyBlue" and I draw a line with logical function GXxor and foreground color = "White", the color of the line drawn is "DeepSkyBlue".

This is probably in the FAQ,  you need to set plane_mask to the
OR of the two colors involved.  A detailed description exists in
at least the O'Reilly books.  The short explanation is that  XOR
xors all the pixel bits and the result had better be a valid
pixel value.


--
Douglas S. Rand <drand@osf.org>		OSF/Motif Dev.
Snail:         11 Cambridge Center,  Cambridge,  MA  02142
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