-(void)drawLine:(CGPoint)fromPnt toPoint:(CGPoint)toPnt{
float xScale = theImageView.p_w_picpath.size.width/theImageView.frame.size.width;
float yScale = theImageView.p_w_picpath.size.height/theImageView.frame.size.height;
UIGraphicsBeginImageContext(theImageView.p_w_picpath.size);
[theImageView.p_w_picpath drawInRect:CGRectMake(0, 0, theImageView.p_w_picpath.size.width, theImageView.p_w_picpath.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapSquare);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 2.0*[self returnMax:xScale withNumber:yScale]);
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), YES);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), fromPnt.x*xScale, fromPnt.y*yScale);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), toPnt.x*xScale, toPnt.y*yScale);
CGContextStrokePath(UIGraphicsGetCurrentContext());
theImageView.p_w_picpath=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
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