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POiOS - Changing control points of Quad Curve?
 

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  1. POiOS - Changing control points of Quad Curve?
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    <p>I have drawn a quad curve with the following code, I also drew 3 ellipses, one for left corner, one for right corner and one for control point.</p> <pre><code>- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextSaveGState(context); CGMutablePathRef curve = CGPathCreateMutable(); CGPathMoveToPoint(curve, nil, 5, 40); CGPathAddQuadCurveToPoint(curve, nil, 30, 20, 55, 40); CGContextAddPath(context, curve); CGContextSetStrokeColorWithColor(context,[UIColor whiteColor].CGColor); CGContextStrokePath(context); CGContextSaveGState(context); CGSize sz = self.frame.size; CGPoint pt = CGPointMake(sz.width/2.0, sz.height/2.0); CGFloat r = 5; middleRect_ = CGRectMake(pt.x - r, pt.y - r, r * 2, r * 2); CGContextAddEllipseInRect(context, middleRect_); CGContextSetFillColorWithColor(context, [[UIColor whiteColor] CGColor]); CGContextFillPath(context); CGContextAddEllipseInRect(context, middleRect_); CGContextSetLineWidth(context, 2); CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextStrokePath(context); //left side sz = self.frame.size; pt = CGPointMake(sz.width/2.0, sz.height/2.0); r = 5; leftRect_ = CGRectMake(pt.x - 27, pt.y + 3, r * 2, r * 2); CGContextAddEllipseInRect(context, leftRect_); CGContextSetFillColorWithColor(context, [[UIColor whiteColor] CGColor]); CGContextFillPath(context); CGContextAddEllipseInRect(context, leftRect_); CGContextSetLineWidth(context, 2); CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextStrokePath(context); //right side sz = self.frame.size; pt = CGPointMake(sz.width/2.0, sz.height/2.0); r = 5; rightRect_ = CGRectMake(pt.x + 20, pt.y + 3, r * 2, r * 2); CGContextAddEllipseInRect(context, rightRect_); CGContextSetFillColorWithColor(context, [[UIColor whiteColor] CGColor]); CGContextFillPath(context); CGContextAddEllipseInRect(context, rightRect_); CGContextSetLineWidth(context, 2); CGContextSetStrokeColorWithColor(context, [[UIColor blackColor] CGColor]); CGContextStrokePath(context); // Cleanup Code CGColorSpaceRelease(colorSpace); CGContextRestoreGState(context); } </code></pre> <p>as you can can see I am using 3 CGRects to store the positions. Now I want that whenenver I touch and drag an ellipse, it changes the curve. for example if touch the middle ellipse, it changes the control point, if I touch the leftRect, it changes left position, if I touch rightRect, it changes the right position. How to do that? I dont have the reference of these ellipses and curve, how can I do this? Thanks</p>
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