//

// 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