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POSmooth line after zooming
 

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    <p>I am trying to implement a drawing feature. Currently I am using UIBezierPath:</p> <pre><code>@interface DrawView : UIView { UIBezierPath *myPath; } @end @implemenation DrawView -(id)initWithFrame:(CGRect)frame { //...normal init code myPath = [[UIBezierPath alloc]init]; myPath.lineCapStyle = kCGLineCapRound; myPath.lineJoinStyle = kCGLineJoinRound; myPath.miterLimit = 0; myPath.lineWidth = 10; } </code></pre> <p>In <code>touchesBegan:</code> I track the startPoint and call <code>[myPath moveToPoint:myTouch locationInView:self];</code> In <code>touchesMoved:</code> I call <code>[myPath addLineToPoint...]; [self setNeedsDisplay]</code>.</p> <p>My DrawView is a subview of a UIScrollView.</p> <p><strong>My problem</strong>: When I zoom in the drawing is very cornered or pixelated.</p> <p>I want to redraw the drawing in a way so it looks nice and smooth, but I can't figure out how or where to start. </p> <p>I've found this simple "solution":</p> <pre><code>-(void)scrollViewDidEndZooming:(UIScrollView*)scrollView withView:(UIView*)view atScale:(float)scale { view.layer.contentsScale = scale; [view setNeedsDisplay]; } </code></pre> <p>When I implement the method in this way the drawing will be smoother after zomming, but the App becomes really laggy and slow. At a high <code>maximumZoomScale</code> of the scrollView the App crahes completely. When I understand the docu correctly setting contentsScale higher than 2 isn't a good idea or changing contensScale in any way isn't so good.</p>
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