add asVector distanceSquare distanceTo get isDegenerate isEqualTo kInvalid kOrigin length negate offset offset operator!= operator* operator* operator* operator* operator*= operator*= operator+ operator+ operator+ operator+= operator+= operator- operator- operator- operator-= operator/ operator/= operator== Point2d Point2d Point2d polarPoint rulerPoint rulerPoint scaleBy scaleBy set set subtract subtract transform x y

polarPoint() Point2d Point2d::polarPoint ( float  angle, float  dist  ) const 极坐标法计算坐标 参数 angle 极角，弧度 dist 极径长度 返回 计算出的坐标 函数调用图: 这是这个函数的调用关系图: