alongLineAngleMoveDistancePt alongLineNormalDir alongLineNormalMoveDistancePt Angle Distance Distance FromPolar GetAngle IsEqual IsLess IsNull Length moveAlongLine Negate Normalize operator* operator* operator*= operator+ operator+ operator+= operator- operator- operator-= operator/ operator/= operator= operator== Perpendicular perpendicularPointOnLine ProjectToLine Rotate Scale Set Sqr Vector2d Vector2d Vector2d Vector2d x y

FromPolar() Vector2d FromPolar ( double  r, double  fi  ) static 从极坐标创建向量 从极坐标创建向量。 参数 [in] r 半径 [in] fi 角度（弧度） 返回 创建的向量