18 Vector2D::Vector2D() :  in Vector2D()  function in Vector2D
22 Vector2D::Vector2D(float x, float y) :  in Vector2D()  function in Vector2D
26 Vector2D Vector2D::copy() {  in copy()
27     Vector2D v(mX, mY);  in copy()
31 void Vector2D::add(const Vector2D& v) {  in add()
36 void Vector2D::sub(const Vector2D& v) {  in sub()
41 void Vector2D::scale(float s) {  in scale()
46 float Vector2D::distance(const Vector2D& v) {  in distance()
52 void Vector2D::normalize() {  in normalize()
59 void Vector2D::limit(float max) {  in limit()
66 float Vector2D::magnitude() {  in magnitude()