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Path: utzoo!linus!philabs!cmcl2!seismo!mcvax!boring!guido
From: guido@boring.UUCP
Newsgroups: net.micro.mac
Subject: How to change font sizes (Re: ascii.question 1)
Message-ID: <6653@boring.UUCP>
Date: Wed, 16-Oct-85 10:52:19 EDT
Article-I.D.: boring.6653
Posted: Wed Oct 16 10:52:19 1985
Date-Received: Fri, 18-Oct-85 21:22:38 EDT
References: <1034@ttds.UUCP>
Reply-To: guido@mcvax.UUCP (Guido van Rossum)
Organization: "Stamp Out BASIC" Committee, CWI, Amsterdam
Lines: 23
Apparently-To: rnews@mcvax.LOCAL

Use the QuickDraw routines to set the font and size of the current GrafPort
(make sure you have done a SetPort):

	TextFont(font_id);
	TextSize(point_size);
	
The "point size" is unrelated to the number of pixels the
font is high, except that larger point sizes give larger characters;
it is up to the font designer how large 12 point letters really are
(a "point" is 1/72 inch but different output devices may give different
results!)

Now the QuickDraw routine GetFontInfo tells you all about the current
font: it fills a struct FontInfo with fields ascent, descent, widMax
and leading, all in pixels.
The line height is ascent+descent+leading; I believe you must fill
TextEdit's FirstBL (first base line) with ascent+leading to get a nice
looking display.  (Leading is the number of blank pixels between lines;
widMax is the maximum width of any character in the font.)
(PS: TextSize(0) will give you the real font that's closest to 12 points.)

-- 
	Guido van Rossum, CWI, Amsterdam (guido@mcvax.UUCP)