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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>CALayerEssentials - /ExampleCALayerDelegate.m</title>
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html#//apple_ref/doc/uid/TP30000943" target="_top">Reference Library</a> > <a href="../index.html#//apple_ref/doc/uid/TP30000925" target="_top">Sample Code</a> > <a href="../GraphicsImaging/index.html#//apple_ref/doc/uid/TP30000925-TP30000424" target="_top">Graphics & Imaging</a> > <a href="../GraphicsImaging/idxQuartz-date.html#//apple_ref/doc/uid/TP30000925-TP30000424-TP30000559">Quartz</a> > <A HREF="javascript:location.replace('index.html');">CALayerEssentials</A> >
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<table width="680" border="0" cellpadding="0" cellspacing="0">
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<td><h1><div id="pagehead">CALayerEssentials</div></h1></td>
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<h2>/ExampleCALayerDelegate.m</h2>
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<p><strong>View Source Code:</strong>
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<option value="listing1.html">/AppController.h</option>
<option value="listing2.html">/AppController.m</option>
<option value="listing3.html">/ExampleCALayerDelegate.h</option>
<option value="listing4.html">/ExampleCALayerDelegate.m</option>
<option value="listing5.html">/ExampleCAOpenGLLayer.h</option>
<option value="listing6.html">/ExampleCAOpenGLLayer.m</option>
<option value="listing7.html">/ExampleCATiledLayerDelegate.h</option>
<option value="listing8.html">/ExampleCATiledLayerDelegate.m</option>
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<option value="listing10.html">/Readme.txt</option></select>
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<p><strong><a href="CALayerEssentials.zip">Download Sample</a></strong> (“CALayerEssentials.zip”, 312.3K)<BR>
<strong><a href="CALayerEssentials.dmg">Download Sample</a></strong> (“CALayerEssentials.dmg”, 320.0K)</p>
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<pre class="sourcecodebox">//
// File: ExampleCALayerDelegate.m
//
// Abstract: A sample delegate for a CALayer that draws random content into the layer.
//
// Version: 1.0
//
// Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc. ("Apple")
// in consideration of your agreement to the following terms, and your use,
// installation, modification or redistribution of this Apple software
// constitutes acceptance of these terms. If you do not agree with these
// terms, please do not use, install, modify or redistribute this Apple
// software.
//
// In consideration of your agreement to abide by the following terms, and
// subject to these terms, Apple grants you a personal, non - exclusive
// license, under Apple's copyrights in this original Apple software ( the
// "Apple Software" ), to use, reproduce, modify and redistribute the Apple
// Software, with or without modifications, in source and / or binary forms;
// provided that if you redistribute the Apple Software in its entirety and
// without modifications, you must retain this notice and the following text
// and disclaimers in all such redistributions of the Apple Software. Neither
// the name, trademarks, service marks or logos of Apple Inc. may be used to
// endorse or promote products derived from the Apple Software without specific
// prior written permission from Apple. Except as expressly stated in this
// notice, no other rights or licenses, express or implied, are granted by
// Apple herein, including but not limited to any patent rights that may be
// infringed by your derivative works or by other works in which the Apple
// Software may be incorporated.
//
// The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
// WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
// WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION
// ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
//
// IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
// CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION ) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION
// AND / OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER
// UNDER THEORY OF CONTRACT, TORT ( INCLUDING NEGLIGENCE ), STRICT LIABILITY OR
// OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.
//
#import "ExampleCALayerDelegate.h"
@implementation ExampleCALayerDelegate
static CGFloat randomFloat()
{
return random() / (double)LONG_MAX;
}
static CGPoint randomPointInBounds(CGRect bounds)
{
CGFloat x = randomFloat() * bounds.size.width + bounds.origin.x;
CGFloat y = randomFloat() * bounds.size.height + bounds.origin.y;
return CGPointMake(x, y);
}
-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
// We aren't interested in the actual content of this layer, we just want to draw something.
// Towards that end, we'll fill the content with a random color,
// then fill a randomly generated polygon.
CGRect bounds = CGContextGetClipBoundingBox(context);
CGContextSetRGBFillColor(context, randomFloat(), randomFloat(), randomFloat(), 1.0);
CGContextFillRect(context, bounds);
int sides = (random() % 18) + 1;
CGPoint p = randomPointInBounds(bounds);
CGContextMoveToPoint(context, p.x, p.y);
for(int i = 0; i < sides; ++i)
{
p = randomPointInBounds(bounds);
CGContextAddLineToPoint(context, p.x, p.y);
}
CGContextClosePath(context);
CGContextSetRGBFillColor(context, randomFloat(), randomFloat(), randomFloat(), 1.0);
CGContextEOFillPath(context);
}
@end
</pre>
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<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=1&url=/samplecode/CALayerEssentials/listing4.html%3Fid%3DDTS40008029-1.0&media=dvd" target=_new>Yes</a>: Tell us what works for you.</div>
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