ExampleCATiledLayerDelegate.m
// |
// File: ExampleCATiledLayerDelegate.m |
// |
// Abstract: A sample delegate for a CATiledLayer that draws zoomable content into the tiled layer. |
// |
// Version: 1.0 |
// |
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#import "ExampleCATiledLayerDelegate.h" |
@implementation ExampleCATiledLayerDelegate |
static CGFloat randomFloat() |
{ |
return random() / (double)LONG_MAX; |
} |
-(id)init |
{ |
self = [super init]; |
if(self != nil) |
{ |
// Create our initial content. |
[self refreshContent]; |
} |
return self; |
} |
-(void)dealloc |
{ |
CGPathRelease(path); |
CGColorRelease(bgColor); |
CGColorRelease(fgColor); |
[super dealloc]; |
} |
-(void)refreshContent |
{ |
CGPathRelease(path); |
CGColorRelease(bgColor); |
CGColorRelease(fgColor); |
// We aren't interested in the actual content of the layer, but we want the same object |
// everytime we draw, so we create a CGPathRef to store a randomly generated path and a CGColorRef |
// to store the color to draw it in. |
bgColor = CGColorCreateGenericRGB(randomFloat(), randomFloat(), randomFloat(), 1.0); |
fgColor = CGColorCreateGenericRGB(randomFloat(), randomFloat(), randomFloat(), 1.0); |
path = CGPathCreateMutable(); |
int sides = (random() % 18) + 1; |
CGPathMoveToPoint(path, NULL, randomFloat() * kTiledLayerExampleWidth, randomFloat() * kTiledLayerExampleHeight); |
for(int i = 0; i < sides; ++i) |
{ |
CGPathAddLineToPoint(path, NULL, randomFloat() * kTiledLayerExampleWidth, randomFloat() * kTiledLayerExampleHeight); |
} |
CGPathCloseSubpath(path); |
} |
-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)context |
{ |
// First, fill the clipping bounds with the background color. |
CGRect bounds = CGContextGetClipBoundingBox(context); |
CGContextSetFillColorWithColor(context, bgColor); |
CGContextFillRect(context, bounds); |
// Then add and fill the pre-generated path with the foreground color. |
CGContextSetFillColorWithColor(context, fgColor); |
CGContextAddPath(context, path); |
CGContextEOFillPath(context); |
} |
@end |
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