//Target Rings in Center
public class Target{

  public Vector2D Pos;
  public Vector2D Vel;
  public Vector2D Force;  //primarily a buffer for force being applied this frame

    public float max_vel;
  public float min_vel;
  public float r;
  public float Mass;
  public float Elasticity;
  public boolean killMe;

  Target()
  {
    Pos = new Vector2D();
    Vel = new Vector2D();
    Force = new Vector2D();

    max_vel = 150.0f;
    min_vel = 50.0f;
    r = 1.0f;
    Mass = 1.0f;
    Elasticity = 1.0f;
    killMe = false;
  }

  public void SetPosition(float x, float y, float delta_t) //be sure to run this function whenever changing paddle position
  {
    //Uses a simple Verlet scheme to determine the velocity of the paddle from two positions
    Vector2D dPos = new Vector2D(x-Pos.x, y-Pos.y);
    Pos.Set(x,y);
    if (delta_t != 0.0f)
      Vel.Set(dPos.Times(1/delta_t));
    else
      Vel.Set(0,0);  //We're basically undefined over an empty time period anyhow
  }

  //returns a copy of the Position vector
  public Vector2D GetPosition()
  {
    return new Vector2D(Pos);
  }

  //Returns a copy of the current Velocity Vector
  public Vector2D GetVelocity()
  {
    return new Vector2D(Vel);
  }

}