Question

I am working on some image processing project where I need to implement eraser on a image. I have to also implement pinch effect to scale the image smaller or larger. Pinch is working nice. Eraser also works perfect If I dont scale the image by pinch. But when I use pinch and then use eraser. The image goes blur. I have implemented eraser on UIPanGestureRecognizer.

Below is the code for eraser.

CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender locationInView:tattooImage];
if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan)
{
     lastPoint = translatedPoint;
     //lastPoint.x += 60;
     //lastPoint.y += 60;
}
else
{
     CGPoint currentPoint = translatedPoint;
     //currentPoint.x += 60;    
     //currentPoint.y += 60;

     UIGraphicsBeginImageContext(tattooImage.frame.size);
     [tattooImage.image drawInRect:CGRectMake(0, 0,tattooImage.frame.size.width, tattooImage.frame.size.height)];
     CGContextSetBlendMode(UIGraphicsGetCurrentContext( ),kCGBlendModeClear);
     CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
     CGContextSetLineWidth(UIGraphicsGetCurrentContext( ), 25.0);

     CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [[UIColor clearColor] CGColor]);
     CGContextBeginPath(UIGraphicsGetCurrentContext());
     CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
     CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
     CGContextStrokePath(UIGraphicsGetCurrentContext()) ;

     tattooImage.image = UIGraphicsGetImageFromCurrentImageContext();
     UIGraphicsEndImageContext();

     lastPoint = currentPoint;
}

Please provide any help. Thanks in advance.

Answer 1

I found the solution. There is a small change which I did and I got the desired result. I changed tattooImage.frame.size with tattooImage.bounds.size everywhere in the code, and It worked perfectly. Thanks to https://stackoverflow.com/users/1389202/pete-c