Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!well!wdh
From: wdh@well.sf.ca.us (Bill Hofmann)
Newsgroups: comp.sys.mac.programmer
Subject: Re: GlobalToLocal() LocalToGlobal() information
Message-ID: <23417@well.sf.ca.us>
Date: 1 Mar 91 19:46:03 GMT
References: <3744.27CD13AE@stjhmc.fidonet.org>
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 14

In article <3744.27CD13AE@stjhmc.fidonet.org> Chris.Gehlker@p12.f56.n114.z1.fidonet.org (Chris Gehlker) writes:
>GW> This LocalToGlobal() translation is simply addition or subtraction 
>GW> from some reference point (window location in global coordinates). 
>GW> This information is contained in the WDEFResource boundsRect 
>GW> element, but I don't know where it goes during the GetWindow( 
>GW> ) function call. Where is this reference point stored? (structure? 
>GW> element?).
>I think the calls just juse the Window Manager Port.
Nope.  Look at the window's portBits.bounds.  This is the coordinates of the
main screen in the coordinate system of the window.  Thus, to convert from
local to global, just subtract the top,left of portBits.bounds, and to convert
from global to local, just add the top,left of portBits.bounds.  This is
what LocalToGlobal and GlobalToLocal do.  
-Bill Hofmann