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From: mtoy@sgi.com (Michael Toy)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Marquee Help?
Message-ID: <2495@odin.SGI.COM>
Date: 5 Jan 90 19:20:27 GMT
References: <18304@dartvax.Dartmouth.EDU>
Sender: news@odin.SGI.COM
Reply-To: mtoy@sgi.com (Michael Toy)
Organization: Silicon Graphics, Entry Systems Division
Lines: 27

One way to get something marquee like, would be to use a set of
patterns of diagonal stripes the following example will draw
a cheap marquee rectangle, looping forever:

char p0[] = { 0x88, 0x44, 0x22, 0x11, 0x88, 0x44, 0x22, 0x11 };
char p1[] = { 0x44, 0x22, 0x11, 0x88, 0x44, 0x22, 0x11, 0x88 };
char p2[] = { 0x22, 0x11, 0x88, 0x44, 0x22, 0x11, 0x88, 0x11 };
char p3[] = { 0x11, 0x88, 0x44, 0x22, 0x11, 0x88, 0x11, 0x22 };

marqueeRect(Rect *pRect)
{
	int patNum = 0;
	char *patterns[4];
	patterns[0] = p0; patterns[1] = p2; patterns[2] = p2; patterns[3] = p3;
	PenMode(patXor);	/* I'm not sure this is either the correct
				   function or parameter name */
	for (;;) {
		long t = TickCount();
		PenPat(patterns[patNum++]);
		patNum &= 3;
		FrameRect(pRect);		/* Draw a rectangle */
		while (TickCount() - t < 4)	/* Wait a bit */
			;
		FrameRect(pRect);		/* Undraw the rectangle */
	}
	PenNormal();
}