Form shadow

shadow.m

- (CGPathRef)renderRect:(UIView*)imgView {
	UIBezierPath *path = [UIBezierPath bezierPathWithRect:imgView.bounds];
	return path.CGPath;
}

- (CGPathRef)renderTrapezoid:(UIView*)imgView {
	CGSize size = imgView.bounds.size;
	
	UIBezierPath *path = [UIBezierPath bezierPath];
	[path moveToPoint:CGPointMake(size.width * 0.33f, size.height * 0.66f)];
	[path addLineToPoint:CGPointMake(size.width * 0.66f, size.height * 0.66f)];
	[path addLineToPoint:CGPointMake(size.width * 1.15f, size.height * 1.15f)];
	[path addLineToPoint:CGPointMake(size.width * -0.15f, size.height * 1.15f)];

	return path.CGPath;
}

- (CGPathRef)renderEllipse:(UIView*)imgView {
	CGSize size = imgView.bounds.size;
	
	CGRect ovalRect = CGRectMake(0.0f, size.height + 5, size.width - 10, 15);
	UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:ovalRect];
	
	return path.CGPath;
}

- (CGPathRef)renderPaperCurl:(UIView*)imgView {
	CGSize size = imgView.bounds.size;
	CGFloat curlFactor = 20.0f;
	CGFloat shadowDepth = 8.0f;

	UIBezierPath *path = [UIBezierPath bezierPath];
	[path moveToPoint:CGPointMake(0.0f, 0.0f)];
	[path addLineToPoint:CGPointMake(size.width, 0.0f)];
	[path addLineToPoint:CGPointMake(size.width, size.height + shadowDepth)];
	[path addCurveToPoint:CGPointMake(0.0f, size.height + shadowDepth)
			controlPoint1:CGPointMake(size.width - curlFactor, size.height + shadowDepth - curlFactor)
			controlPoint2:CGPointMake(curlFactor, size.height + shadowDepth - curlFactor)];

	return path.CGPath;
}


- (void)loadView {
	[super loadView];
	
	// Add background tile
	UIImage *bgImage = [UIImage imageNamed:@"embedded_bg.png"];
	self.view.backgroundColor = [UIColor colorWithPatternImage:bgImage];

	// Add the reference view
	UIImage *image = [UIImage imageNamed:@"dccp.jpeg"];
	UIImageView *imgView = [[UIImageView alloc] initWithImage:image];
	[self.view addSubview:imgView];
	imgView.center = self.view.center;
	
	imgView.layer.shadowColor = [UIColor colorWithWhite:0 alpha:0.8].CGColor;
	imgView.layer.shadowOpacity = 0.7f;
	imgView.layer.shadowOffset = CGSizeMake(0.0f, 10.0f);
	imgView.layer.shadowRadius = 5.0f;
	imgView.layer.masksToBounds = NO;

//	imgView.layer.shadowPath = [self renderRect:imgView];
	//imgView.layer.shadowPath = [self renderTrapezoid:imgView];
	//imgView.layer.shadowPath = [self renderEllipse:imgView];
	imgView.layer.shadowPath = [self renderPaperCurl:imgView];
	
	[imgView release];
}