2 点間に線を引く方法は既に知っていますが、線が滑らかではないようです。スムーズにするにはどうすればよいですか？ありがとうございます。
- (void)drawLineFrom:(CGPoint)start To:(CGPoint)end {
// begin image context
UIGraphicsBeginImageContext(self.imageLineView.frame.size);
// define image rect for drawing
[self.imageLineView.image drawInRect:CGRectMake(0, 0, imageLineView.frame.size.width, imageLineView.frame.size.height)];
// set line properties
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 2.0f);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0f, .0f, .0f, 1.0);
// move context to start point
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), start.x, start.y);
// define path to end point
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), end.x, end.y);
// stroke path
CGContextStrokePath(UIGraphicsGetCurrentContext());
// flush context to be sure all drawing operations were processed
CGContextFlush(UIGraphicsGetCurrentContext());
// get UIImage from context and pass it to our image view
imageLineView.image = UIGraphicsGetImageFromCurrentImageContext();
// end image context
UIGraphicsEndImageContext();
}
