iOS开发中,根据三个点得到之间的夹角

以三个点A、B、C,计算ㄥABC为例,贴代码:code + (CGFloat)getAnglesWithThreePoint:(CGPoint)pointA pointB:(CGPoint)pointB pointC:(CGPoint)pointC { CGFloat x1 = pointA.x - pointB.x; CGFloat y1 = pointA.y - po
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