In an attempt to figure out how well gesture recognizers work, I've built a
very simple app that uses a UIPanGestureRecognizer and using them to construct
a UIBezierPath that I then stroke, but I am getting strange artifacts on the
resulting drawing operation (see http://cl.ly/0N2R411O1t1x3w2N3Q3q for example).
The code I use is fairly simple; I start with a call to -moveToPoint:, followed
by a bunch of -addLineToPoint: calls. Other than the fact that I am recording
the points using touch, there is nothing unusual in the code (that I can see):
- (void) pannedRefineEdge:(UIPanGestureRecognizer *) recognizer {
switch (recognizer.state) {
case UIGestureRecognizerStateBegan:
_path = [[UIBezierPath alloc] init];
[_path moveToPoint:[recognizer locationInView:self.backgroundView]];
break;
case UIGestureRecognizerStateChanged:
[_path addLineToPoint:[recognizer
locationInView:self.backgroundView]];
break;
case UIGestureRecognizerStateEnded:
// This calls a function that sets up an image drawing context and
then:
_path.lineCapStyle = kCGLineCapRound;
_path.lineJoinStyle = kCGLineJoinRound;
_path.lineWidth = 10.0;
[[UIColor colorWithRed:1.0 green:0.6 blue:0.6 alpha:1.0] setStroke];
[_path stroke];
break;
default:
break;
}
}
Any ideas what could be causing the problem?
Thanks,
Marco
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