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From: drew@cat45.CS.WISC.EDU (Shawn Drew)
Newsgroups: comp.sys.mac.programmer
Subject: Easy PICT question
Message-ID: <2327@puff.cs.wisc.edu>
Date: 24 Feb 89 23:48:10 GMT
Sender: news@puff.cs.wisc.edu
Reply-To: drew@cat45.CS.WISC.EDU (Shawn Drew)
Distribution: usa
Organization: U of Wisconsin CS Dept
Lines: 34

I have recently delved into that mystifying realm of QuickDraw and am having
a few problems.

In a dialog box, I draw a map.  I would like to overlay an "X-marks-the-spot"
symbol on the map, but am having problems.  Instead of just putting the
pixels that form the X itself, it also puts the white pixels in, resulting
in a white square with an X in it.  (I want the X to be Xor-ed onto the map)

Is there any way I can get rid of the white square?

This problem is reminiscent of the difference between the marquee and lasso
tools in MacPaint.  I want QuickDraw to use the equivalent of the lasso tool
when drawing, but it's using the marqee.

For example:  (assume x is a black pixel, space is a white pixel)

		xxxxxxxxxx	xxxxxxxxxx	xxxxxxxxxx
  x x		xxxxxxxxxx	xxx x xxxx	x  x x  xx
 xx xx		xxxxxxxxxx	xx  x  xxx	x xx xx xx
xxxxxxx		xxxxxxxxxx	x       xx	xxxxxxxxxx
 xx xx		xxxxxxxxxx	xx  x  xxx	x xx xx xx
  x x		xxxxxxxxxx	xxx x xxxx	x  x x  xx
		xxxxxxxxxx	xxxxxxxxxx	xxxxxxxxxx
Source BMap	Dest. BMap	What I want	What I get

What am I doing wrong?

Thanks for any help you can offer.



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                    drew@cat45.cs.wisc.edu