#define pointRotatedAroundAnchorPoint(point,anchorPoint,angle) CGPointMake((point.x-anchorPoint.x)*cos(angle) - (point.y-anchorPoint.y)*sin(angle) + anchorPoint.x, (point.x-anchorPoint.x)*sin(angle) + (point.y-anchorPoint.y)*cos(angle)+anchorPoint.y)#define pointRotatedAroundAnchorPoint(point,anc
阅读背景：
iOS-计算绕某点旋转得到旋转后的点公式
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