- /*
- struct Derivative
- {
- Mf::Vector2 velocity;
- Mf::Vector2 force;
-
- Derivative operator*(Mf::Scalar dt) const
- {
- Derivative derivative;
- derivative.velocity = dt * velocity;
- derivative.force = dt * force;
- return derivative;
- }
-
- Derivative operator+(const Derivative& other) const
- {
- Derivative derivative;
- derivative.velocity = velocity + other.velocity;
- derivative.force = force + other.force;
- return derivative;
- }
- };
-
- struct State
- {
- // primary
-
- Mf::Vector2 position;
- Mf::Vector2 momentum;
- Mf::Vector2 force;
-
- // secondary
-
- Mf::Vector2 velocity;
-
- // constant
-
- Mf::Scalar mass;
- Mf::Scalar inverseMass;
-
- void recalculate()
- {
- velocity = momentum * inverseMass;
- }
-
-
- void getDerivative(Derivative& derivative, Mf::Scalar t) const
- {
- //derivative.velocity = Mf::Vector2(0.0, 0.0);
- //derivative.force = Mf::Vector2(0.0, 0.0);
- derivative.velocity = velocity;
- derivative.force = force;
-
- //Mf::Vector2 x = position - Mf::Vector2(500.0, 200.0);
- //derivative.force += -15.0 * x - 1.5 * velocity;
- }
-
- void applyDerivative(const Derivative& derivative, Mf::Scalar dt)
- {
- position += dt * derivative.velocity;
- momentum += dt * derivative.force;
- recalculate();
- }
-
- // these two operator overloads all using the state in generic
- // interpolator implementations
-
- State operator*(Mf::Scalar scalar) const
- {
- State state = *this;
- state.position *= scalar;
- state.momentum *= scalar;
- state.recalculate();
- return state;
- }
-
- State operator+(const State& state) const
- {
- State newState = *this;
- newState.position += state.position;
- newState.momentum += state.momentum;
- newState.recalculate();
- return newState;
- }
- };
-*/
-
- Mf::State2 previous;
- Mf::State2 current;
-
-
-private:
-
- static const Mf::Scalar z = 96.0;
-