gistfile1.m

- (UIImage*)upsideDownBunny {
	UIImage *img = [UIImage imageNamed:"@bunny.png"];
	CGSize imgSize = [img size];
	UIGraphicsBeginImageContext(imgSize);
	CGContextRef context = UIGraphicsGetCurrentContext();
	CGContextRotateCTM(context, M_PI);
	CGContextTranslateCTM(context, -imgSize.width, -imgSize.height);
	[img drawInRect:CGRectMake(0, 0, imgSize.width, imgSize.height)];
	UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	return newImage;
}