Created
February 26, 2013 13:18
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// | |
// CustomView.m | |
// MaskTest | |
// | |
// Created by Sean Christmann on 12/22/08. | |
// Copyright 2008 EffectiveUI. All rights reserved. | |
// | |
#import "MagnifierView.h" | |
@implementation MagnifierView | |
@synthesize viewref, touchPoint; | |
- (id)initWithFrame:(CGRect)frame { | |
if (self = [super initWithFrame:frame]) { | |
// Initialization code | |
self.backgroundColor = [UIColor clearColor]; | |
} | |
return self; | |
} | |
- (void)drawRect:(CGRect)rect { | |
printf("draw magnifying glass\n"); | |
if(cachedImage == nil){ | |
UIGraphicsBeginImageContext(self.bounds.size); | |
[self.viewref.layer renderInContext:UIGraphicsGetCurrentContext()]; | |
cachedImage = [UIGraphicsGetImageFromCurrentImageContext() retain]; | |
UIGraphicsEndImageContext(); | |
} | |
CGImageRef imageRef = [cachedImage CGImage]; | |
CGImageRef maskRef = [[UIImage imageNamed:@"loopmask.png"] CGImage]; | |
CGImageRef overlay = [[UIImage imageNamed:@"loop.png"] CGImage]; | |
CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), | |
CGImageGetHeight(maskRef), | |
CGImageGetBitsPerComponent(maskRef), | |
CGImageGetBitsPerPixel(maskRef), | |
CGImageGetBytesPerRow(maskRef), | |
CGImageGetDataProvider(maskRef), | |
NULL, | |
true); | |
//Create Mask | |
CGImageRef subImage = CGImageCreateWithImageInRect(imageRef, CGRectMake(touchPoint.x-18, touchPoint.y-18, 36, 36)); | |
CGImageRef xMaskedImage = CGImageCreateWithMask(subImage, mask); | |
// Draw the image | |
// Retrieve the graphics context | |
CGContextRef context = UIGraphicsGetCurrentContext(); | |
CGAffineTransform xform = CGAffineTransformMake( | |
1.0, 0.0, | |
0.0, -1.0, | |
0.0, 0.0); | |
CGContextConcatCTM(context, xform); | |
CGRect area = CGRectMake(touchPoint.x-42, -touchPoint.y, 85, 85); | |
CGRect area2 = CGRectMake(touchPoint.x-40, -touchPoint.y+2, 80, 80); | |
CGContextDrawImage(context, area2, xMaskedImage); | |
CGContextDrawImage(context, area, overlay); | |
CGImageRelease(mask); | |
CGImageRelease(subImage); | |
CGImageRelease(xMaskedImage); | |
} | |
- (void)dealloc { | |
[cachedImage release]; | |
[viewref release]; | |
[super dealloc]; | |
} | |
@end |
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