Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!cs.utexas.edu!rutgers!njin!jvnca!fields
From: fields@jvnca.csc.org (Derek Fields lac11191)
Newsgroups: comp.sys.mac.programmer
Subject: Question about GlobalToLocal
Message-ID: <579@jvnca.csc.org>
Date: 4 Jan 90 21:55:46 GMT
Reply-To: fields@jvnca.csc.org.UUCP (Derek Fields lac11191)
Organization: John von Neumann Center, Princeton, N.J.
Lines: 32

I am a relatively new Mac programmer playing with Think C vers. 4.0.  I
am trying to learn to work with controls and windows and have a problem
with GlobalToLocal.  My code is below:

				cPart = FindWindow(theEvent.where, &curwind);
				SelectWindow(curwind);
				click = theEvent.where;
				GlobalToLocal(&click);
				cPart = FindControl (click, curwind, &move);

When I watch the variables theEvent.where and click I find the following
behavior:

	click = -211,-442 when theEvent.where = 109,46
	click = -209,-398 when theEvent.where = 111,90

It appears that the local coordinate system is defined with the origin
near the bottom, right of the window, but I know that this is not the
case because I tried setting the origin to 0,0 and had no change in behavior.

In case it is important, the window was set up with NewWindow and with the
Rect = 50,10,300,400.  I would have expected that GlobalToLocal
at 109,46 would have returned 49,36.

If you can help, please email me.


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