How to stretch images on touch direction in iPhone sdk? - iphone

Question

I am working on customizing images. My requirement is to stretch or shrink image in touch direction & cropping image. I have done cropping but how I can stretch & shrink image in touch direction. Is it possible?

Answer 1

Your question in not clear.but if you want to scale or rotate image with touch event.then in viewdidload write this code.
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc]
initWithTarget:self action:#selector(rotateImage:)];
[self.view addGestureRecognizer:rotationGesture];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc]
initWithTarget:self action:#selector(scaleImage:)];
[self.view addGestureRecognizer:pinchGesture];
[pinchGesture release];
And using this code you can rotate or scale images in touch direction.
- (void)scaleImage:(UIPinchGestureRecognizer *)recognizer
{
if([recognizer state] == UIGestureRecognizerStateEnded) {
previousScale = 1.0;
return;
}
CGFloat newScale = 1.0 - (previousScale - [recognizer scale]);
CGAffineTransform currentTransformation = yourimage.transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransformation,
newScale, newScale);
yourimage.transform = newTransform;
previousScale = [recognizer scale];
}
- (void)rotateImage:(UIRotationGestureRecognizer *)recognizer
{
if([recognizer state] == UIGestureRecognizerStateEnded) {
previousRotation = 0.0;
return;
}
CGFloat newRotation = 0.0 - (previousRotation - [recognizer rotation]);
CGAffineTransform currentTransformation = yourimage.transform;
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransformation, newRotation);
yourimage.transform = newTransform;
previousRotation = [recognizer rotation];
}