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From: scott@applix.UUCP (Scott Evernden)
Newsgroups: comp.sys.amiga
Subject: Re: Clipping within a window.
Message-ID: <536@applix.UUCP>
Date: Sat, 27-Jun-87 22:12:31 EDT
Article-I.D.: applix.536
Posted: Sat Jun 27 22:12:31 1987
Date-Received: Sun, 28-Jun-87 05:00:23 EDT
References: <205@sugar.UUCP> <186@dana.UUCP>
Reply-To: scott@applix.UUCP (Scott Evernden)
Organization: APPLiX Inc., Westboro MA
Lines: 51

In article <205@sugar.UUCP>, peter@sugar.UUCP (Peter DaSilva) writes:
> I want to clip some text (or graphic) output to within the borders of a
> simplerefresh window. What's the best way to do this? I know I can use
> superbitmap with GZZ, but that's rather overkill for text only output.
> That is, I guess, how do I set up a clipping rectangle of my own within a
> window?

The following frags are pulled from one code skeleton I sometimes use:
It uses the (great) new 1.2 Layers function 'InstallClipRegion()'.

struct Region *region;	/* region to describe clipping area/region */
struct Rectangle rect;	/* help for building 'region' clipping area */
struct Window *w;	/* our window; if necessary,
			   use Andy Finkel's code to get from console */
struct Layer *layer;	/* gets ptr to our window's layer */

long LayersBase;	/* we'll be using this library */
	.
	.
	.
	/* Early, as part of your init code */
	LayersBase = (long) OpenLibrary("layers.library", 33L);
	region = NewRegion();

	/* Assuming your window is 'w': */
	layer = w->RPort->Layer;

	/* Form the clipping rectangle region */
	rect.MinX = MINX;		/* your choice */
	rect.MinY = MINY;
	rect.MaxX = MAXX;
	rect.MaxY = MAXY;
	OrRectRegion(region, &rect);
	.
	.
	.
	/* To use this clipping rectangle: */
	InstallClipRegion(layer, region);
	.
	.
	.
	/* Before the 'w' window gets closed! */
	InstallClipRegion(layer, (struct Region *) NULL);		

	/* necessary cleanup */
	DisposeRegion(region);
	CloseLibrary(LayersBase);

Hope this is helpful!

-scott