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

rulerPoint() [2/2] Point2d Point2d::rulerPoint ( const Point2d &  dir, float  xoff, float  yoff  ) const 移动直尺法 相对于起始点(本点)和方向点，在沿线方向和垂直沿线方向分别偏移计算坐标 参数 dir 方向点，本点→方向点 xoff 在沿线方向(→)偏移 yoff 垂直沿线方向(↑)偏移 返回 计算出的坐标 函数调用图: