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From: jason@ux1.cso.uiuc.edu (Jason Watts)
Newsgroups: comp.sys.mac.programmer
Subject: Re: GlobalToLocal() LocalToGlobal() information
Message-ID: <1991Mar8.090224.14194@ux1.cso.uiuc.edu>
Date: 8 Mar 91 09:02:24 GMT
References: <3744.27CD13AE@stjhmc.fidonet.org> <23417@well.sf.ca.us> <1991Mar7.203748.20407@jato.jpl.nasa.gov>
Organization: University of Illinois at Urbana
Lines: 23

dundas@granite.jpl.nasa.gov (John Dundas) writes:

>In MPW, the following macros perform the equivalent function to their
>ROM counterparts.

>#define GLOBALTOLOCAL(_pt)	(((Point * )(_pt))->h += qd.thePort->portBits.bounds.left), \
>				(((Point * )(_pt))->v += qd.thePort->portBits.bounds.top)
>#define LOCALTOGLOBAL(_pt)	(((Point * )(_pt))->h += -qd.thePort->portBits.bounds.left), \
>				(((Point * )(_pt))->v += -qd.thePort->portBits.bounds.top)

	I don't know what this note is responding to, as I missed the
beginning of this thread.  But, at any rate, it seems like these
definitions won't work if qd.thePort is a color port.  In such a case

	( **( ( CGrafPtr ) qd.thePort )->portPixMap ).bounds

would need to be substituted for qd.thePort->portBits.bounds.

-- 
                       |  |    |====================|
                       |  |    | Jason Watts        |
                     \ |\ |\ \ | (jazzin@uiuc.edu)  |
                      \| \| \|\|====================|