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

perpendicularPointOnLine() Vector2d perpendicularPointOnLine ( const Vector2d &  A, const Vector2d &  B  ) 计算当前点到直线 AB 的垂足 计算当前点到直线 AB 的垂足。 参数 [in] A 直线的起点 [in] B 直线的终点 返回 垂足