Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!stevec
From: stevec@Apple.COM (Steve Christensen)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Source code request
Message-ID: <51694@apple.Apple.COM>
Date: 19 Apr 91 00:05:36 GMT
References: <4c3JO2600WBLE0ZlJU@andrew.cmu.edu>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 43

rg2c+@andrew.cmu.edu (Robert Nelson Gasch) writes:
>I've been trying to get CopyBits to work properly, but so far I have
>managed to generate nothing but junk. This has gone on for quite
>a while by now and it's getting annoying. So if anybody out
>there has the source code for some program they would be willing
>to donate, I'd appreciate hearing from them. Alternativeley,
>if some samples exist on some FTP server, I'd be equally happy.
>I just want something I can look at and figure out what I'm
>doing wrong. Anything will do.

Well, here's a sample snippet that uses CopyBits.  Let's assume we have already
created a window and we want to draw an icon in it (yes, I know we could just
call PlotIcon, but this is an example).

WindowPtr	theWindow;
BitMap		theBits;
Rect		destRect;
Handle		theIcon;


theIcon = GetResource('ICON', 128);		// get the icon
HLock(theIcon);					//  and lock it while we use it

theBits.baseAddr = *theIcon;			// point to the icon's data
theBits.rowBytes = 4;				// 32 pixels == 4 bytes
SetRect(&theBits.bounds,0,0,16,16);		// icon's bounding rectangle

SetRect(destRect,20,10,36,26);			// where the icon goes

CopyBits(&theBits,&theWindow->portBits,&theBits.bounds,&destRect,srcCopy,nil);


That's all there is to it.  You could also specify theBits.bounds in the
window's local coordinates and use it as both the srcRect and dstRect in
this case.  You could also specify a portion of the icon by setting up another
rectangle in theBits.bounds' coordinate system and use it for the srcRect...

steve

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Steve Christensen			Never hit a man with glasses.
  stevec@apple.com			Hit him with a baseball bat.