using System;
using System.Collections.Generic;
using System.Text;
using RungeKutta.Integrators;

namespace RungeKutta.SimStep
{
    class SemiExplicitEuler : SimStepper
    {
        public State Integrate(State oldState, float timestep, ODEs.ODE ode)
        {
            return Integrate(oldState, timestep, ode.EvaluateForceAtState(oldState));
        }

        public State Integrate(State oldState, float timestep, float acceleration)
        {
            oldState.acceleration = acceleration;
            oldState.velocity += EulerStep.Integrate(timestep, oldState.acceleration);
            oldState.position += EulerStep.Integrate(timestep, oldState.velocity);

            return oldState;
        }

        public override string ToString()
        {
            return "Semi Explicit Euler";
        }

        public int ForceEvaluations
        {
            get
            {
                return 1;
            }
        }
    }
}