iOS图像处理之绘制直线
-(void)drawLine:(CGPoint)fromPnt toPoint:(CGPoint)toPnt{ float xScale = theImageView.image.size.width/theImageView.frame.size.width; float yScale = theImageView.image.size.height/theImageView.frame.size.height; UIGraphicsBeginImageContext(theImageView.image.size); [theImageView.image drawInRect:CGRectMake(0, 0, theImageView.image.size.width, theImageView.image.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.image=UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } 本文转自 卓行天下 51CTO博客，原文链接：http://blog.51cto.com/9951038/1772572，如需转载请自行联系原作者
