/*

     File: QuartzBlending.m

 Abstract: Demonstrates Quartz Blend modes (QuartzBlendingView).

  Version: 3.0

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*/

#import "QuartzBlending.h"

@implementation QuartzBlendingView

-(void)drawInContext:(CGContextRef)context

{

    // Start with a background whose color we don't use in the demo

    CGContextSetGrayFillColor(context, 0.2, 1.0);

    CGContextFillRect(context, self.bounds);

    // We want to just lay down the background without any blending so we use the Copy mode rather than Normal

    CGContextSetBlendMode(context, kCGBlendModeCopy);

    // Draw a rect with the "background" color - this is the "Destination" for the blending formulas

    CGContextSetFillColorWithColor(context, self.destinationColor.CGColor);

    CGContextFillRect(context, CGRectMake(110.0, 20.0, 100.0, 100.0));

    // Set up our blend mode

    CGContextSetBlendMode(context, self.blendMode);

    // And draw a rect with the "foreground" color - this is the "Source" for the blending formulas

    CGContextSetFillColorWithColor(context, self.sourceColor.CGColor);

    CGContextFillRect(context, CGRectMake(60.0, 45.0, 200.0, 50.0));

}

-(void)setSourceColor:(UIColor*)src

{

    if (src != _sourceColor)

    {

        _sourceColor = src;

        [self setNeedsDisplay];

    }

}

-(void)setDestinationColor:(UIColor*)dest

{

    if (dest != _destinationColor)

    {

        _destinationColor = dest;

        [self setNeedsDisplay];

    }

}

-(void)setBlendMode:(CGBlendMode)mode

{

    if (mode != _blendMode)

    {

        _blendMode = mode;

        [self setNeedsDisplay];

    }

}

@end