//

// File:       ExampleCALayerDelegate.m

//

// Abstract:   A sample delegate for a CALayer that draws random content into the layer.

//

// Version:    1.0

//

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#import "ExampleCALayerDelegate.h"

@implementation ExampleCALayerDelegate

static CGFloat randomFloat()

{

    CGFloat f = (rand() % RAND_MAX) / (float)(RAND_MAX);

    return f;

}

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