旋转饼图，它是带有触摸事件的 CALayer
我正在使用 core-plot 来绘制饼图。我在 CPTPieChart.h 的触摸拖动事件中使用此代码。
-(BOOL)pointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)interactionPoint{
int x = self.anchorPoint.x;
int y = self.anchorPoint.y;
float dx = interactionPoint.x - x;
float dy = interactionPoint.y - y;
double a = atan2(dx,dy);
self.transform = CATransform3DMakeRotation(a, 0, 0, 1);
return YES;
}
饼图正在轻微旋转，但顶部和底部在旋转时会被剪裁。 任何帮助将不胜感激。谢谢！
Iam using core-plot for drawing pie charts. I am using this code in the touch drag event of the CPTPieChart.h.
-(BOOL)pointingDeviceDraggedEvent:(id)event atPoint:(CGPoint)interactionPoint{
int x = self.anchorPoint.x;
int y = self.anchorPoint.y;
float dx = interactionPoint.x - x;
float dy = interactionPoint.y - y;
double a = atan2(dx,dy);
self.transform = CATransform3DMakeRotation(a, 0, 0, 1);
return YES;
}
The piechart is rotating mildly but the top and bottom portion are clipping upon rotating.
Any help will be greatly appreciated. Thanks!
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我在使用
transform = CATransform3DMakeRotation(a, 0, 0, 1)旋转 CPTPieChart 时遇到了相同的裁剪问题。不太确定是什么原因造成的。我通过更改
startAngle属性而不是transform属性来解决这个问题。请参阅：http://groups.google.com/group/coreplot-discuss /browse_thread/thread/4372a7590c474c85
I encountered the same clipping problem when rotating a CPTPieChart using
transform = CATransform3DMakeRotation(a, 0, 0, 1). Not exactly sure what's causing it.I worked around it by altering the
startAngleproperty instead of thetransformproperty.See: http://groups.google.com/group/coreplot-discuss/browse_thread/thread/4372a7590c474c85