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November 10, 2021 17:21
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Matching arc, ellipses or circular path to a touch location
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| - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event { | |
| ^ (UITouch * touch) { | |
| CGPoint center = CGPointMake(CGRectGetMaxX(rect), CGRectGetMaxY(rect)); | |
| CGPoint tp = [touch preciseLocationInView:touch.view]; | |
| CGFloat radius = sqrt(pow(tp.x - center.x, 2.0) + pow(tp.y - center.y, 2.0)); | |
| UIBezierPath * bezier_quad_curve = [UIBezierPath bezierPathWithArcCenter:center | |
| radius:radius | |
| startAngle:degreesToRadians(270.0) | |
| endAngle:degreesToRadians(180.0) | |
| clockwise:FALSE]; | |
| }([touches.anyObject]); | |
| } |
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This code resizes an arc as a finger is dragged across the screen, its edge matching the touch location precisely.