import java.util.*;
import java.awt.*;

public class Oscillator extends PhysicsElement implements Attachable{
   private static int id=0;  // Oscillator's identification number
   private double center;     // oscillator's center
   private double amplitude;     // oscillation's amplitude
   private double w;     // oscillator's frequency [rad]
   private double time;
   private double pos_t; 
   private double pos_tPlusDelta; 
   private Spring spring=null;
   
   private Oscillator(){   // nobody can create a block without state
     this(1.0,0.3,0.5);
   }
   public Oscillator(double c, double a, double f){ // f frequency in Hz
      super(id++);
      pos_t = pos_tPlusDelta = center = c;
      amplitude = a;
      w = 2*Math.PI*f;
      time=0;
   }
   public void attach(Spring s){
     // to be coded
   }
   public double getPosition() {
      return pos_t;
   }
   public void computeNextState(double delta_t) {
      time+=delta_t;
      pos_tPlusDelta = center + amplitude*Math.sin(w*time);
   }
   public void updateState(){
   // to be coded
   }

   public String getDescription() {
// to be coded
   }
   public String getState() {
// to be coded
   }
}