line drawing and erasing write it between the touch moved + iphone

UITouch *touch = [touches anyObject];   
    CGPoint currentPoint = [touch locationInView:self.colorView];
      //currentPoint.y -= 20;
        if (appDelegate.iphoneIpad==1) {
            drawPencil.frame=CGRectMake(currentPoint.x+5,currentPoint.y-30,drawPencil.frame.size.width,drawPencil.frame.size.height);       
           
        }
        else{
            drawPencil.frame=CGRectMake(currentPoint.x+10,currentPoint.y-80,drawPencil.frame.size.width,drawPencil.frame.size.height);       
           
        }
       
        if (eraseDrawImg==NO) {
                //For Drawing of line....
           
                //drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
                UIGraphicsBeginImageContext(self.colorView.frame.size);
                [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
                CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
                CGContextSetLineWidth(UIGraphicsGetCurrentContext(), eraseSize);
                
                    CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(),color);
               
                CGContextBeginPath(UIGraphicsGetCurrentContext());
                CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
                CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
                CGContextStrokePath(UIGraphicsGetCurrentContext());
                drawImage.image=UIGraphicsGetImageFromCurrentImageContext();
                          
                UIGraphicsEndImageContext();  
                
            } 
            else{
                //For Erasing of Drawn line....

                UIGraphicsBeginImageContext(self.colorView.frame.size);
                [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
                CGContextSetLineCap(UIGraphicsGetCurrentContext(),kCGImageAlphaNone); //kCGImageAlphaPremultipliedLast);
                CGContextSetLineWidth(UIGraphicsGetCurrentContext(), eraseSize);
                CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1, 0, 0, 10);
                CGContextAddArc(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y, eraseSize, 0.0, 2*M_PI, 0);//, 50, 50, 50, 0.0, 2*M_PI, 0);
                CGContextClip(UIGraphicsGetCurrentContext());
                CGContextClearRect(UIGraphicsGetCurrentContext(),self.colorView.frame);

                CGContextBeginPath(UIGraphicsGetCurrentContext());
                CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
                CGContextClearRect(UIGraphicsGetCurrentContext(), CGRectMake(lastPoint.x, lastPoint.y, eraseSize,eraseSize));
                
                CGContextStrokePath(UIGraphicsGetCurrentContext());
                drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
                UIGraphicsEndImageContext();
            }           
           // NSLog(@"%d",imageTag);
         NSLog(@"%@",lineArray);
        lastPoint = currentPoint;
   
        mouseMoved++;
   
    if (mouseMoved == 10) {
        mouseMoved = 0;
        }
    }