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

IsEqual() bool IsEqual ( const Vector2d &  v, double  tolerance = 0.0  ) const 比较两个向量是否相等 比较两个向量是否相等，允许指定容差。 参数 [in] v 另一个向量 [in] tolerance 容差 返回 如果两个向量在容差范围内相等，返回 true；否则返回 false