import javax.swing.JFrame;
import javax.swing.*;
import java.awt.Container;

public class PhysicsLab {
   public static void main(String[] args) {
      PhysicsLab_GUI lab_gui = new PhysicsLab_GUI();
      lab_gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      lab_gui.setVisible(true);
   }
}

class PhysicsLab_GUI extends JFrame {
   public PhysicsLab_GUI() {
      setTitle("My Small and Nice Physics Laboratory");
      setSize(MyWorldView.WIDTH, MyWorldView.HEIGHT+50);  // height+50 to account for menu height
      MyWorld world = new MyWorld();
      MyWorldView  worldView = new MyWorldView(world);
      world.setView(worldView);
      add(worldView);
      createConfiguration(world);
      world.repaintView();
      world.start();
   }
   private void createConfiguration(MyWorld world) {
      double mass = 1.0;      // 1 [kg] 
      Vector2D position = new Vector2D(0.2,0.4);  
      Vector2D speed = new Vector2D();
      Ball b = new Ball(mass, position, speed);
      world.addElement(b);
      Spring s = new Spring(1.0, 1.0);
      world.addElement(s);
      s.attachEnd(b);
      b = new Ball(2*mass, new Vector2D(1.4, 1.4), speed);
      s.attachEnd(b); 
      world.addElement(b);
   }
}