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

Perpendicular() Vector2d Perpendicular ( bool  clockwise = false ) const 计算向量的法向量 计算向量的法向量，可以选择顺时针或逆时针方向。 参数 [in] clockwise 是否顺时针方向 返回 法向量