import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class pendel2 extends Applet implements MouseListener, Runnable{
  int pyX=250;
  int pyY=30;
  int pX=250;
  int pY;
  int s=1;
  int m=0;
  int pnX, pnY;
  int psuurus=70;
  int pendlipikkus=300;
  int laius=500;
  boolean veel=false;
  double nurgamuut=Math.toRadians(2); 
  double nurk=Math.toRadians(380);
  double nurk2=0; 
  double nv=Math.toRadians(0);
  double n2=0;
  double a;
  TextField tx=new TextField("");
  
  public pendel2(){
  	addMouseListener(this);
  	add(tx);    	
  }
  
  public void mousePressed(MouseEvent e){}
  public void mouseReleased(MouseEvent e){}
  public void mouseEntered(MouseEvent e){}
  public void mouseExited(MouseEvent e){}
  public void mouseClicked(MouseEvent e){
  	 if(m%2>0){
  	 	veel=false;
  	 	pyX=e.getX();
  	 	pyY=e.getY();
  	 	m++;
  	 }else{
  	   veel=true;
  	   pX=e.getX();
  	   pY=e.getY();
  	   pendlipikkus=(int)Math.sqrt((pX-pyX)*(pX-pyX)+(pY-pyY)*(pY-pyY));
  	   a=pendlipikkus;
  	   nurk2=Math.asin(Math.toRadians((pY-pyY)/a));
  	   //nurk=Math.toRadians(nurk2);
  	   tx.setText(""+nurk);
  	   System.out.println(nurk);
  	   m++;
  	   nv=Math.toRadians(0);
  	   new Thread(this).start();	
  	 }	
  }
  
  
  
  public void run(){  
    liigutaja();
  }
  	
  public void update(Graphics g){
    paint(g);	
  }
  
  void liigutaja(){
  	while(veel){	  
  	  if(nurk>Math.toRadians(390)){						//vasakult paremale
  	    s=-1;
      }
  	  if(nurk<Math.toRadians(330)){
  	  	s=1;
  	  }
  	  if(nurk>Math.toRadians(360))nurgamuut=Math.sin((Math.toRadians(390)-nurk)/pendlipikkus*50)+0.005;
  	  if(nurk<Math.toRadians(360))nurgamuut=Math.sin((Math.toRadians(330)-nurk)/pendlipikkus*50)-0.005;
  	  if(nurgamuut<0)nurgamuut=nurgamuut*(-1);
  	  nurk+=(nurgamuut*s)+n2;	
      pX=(int)(Math.sin(nurk)*pendlipikkus)+pyX;
      pY=(int)(Math.cos(nurk)*pendlipikkus)+pyY;
      try{Thread.sleep(10);}catch (InterruptedException ex){}
      repaint();  	
    }
  }
  
  public void paint(Graphics g){
    Image puhver=createImage(getWidth(), getHeight());
    Graphics g2=puhver.getGraphics();
    g2.drawLine(pyX, pyY, pX, pY);
    pnX=pX-psuurus/2;
    pnY=pY-psuurus/2;
    g2.drawOval(pnX, pnY, psuurus, psuurus);
    g2.fillOval(pnX, pnY, 70, 70);
    g.drawImage(puhver, 0, 0, this); 
  }
  
  
  public static void main(String argumendid[]){
    Frame f=new Frame("Pendel");
    f.add(new pendel2());
    f.setSize(500, 500);
    f.setVisible(true);   
    f.setResizable(false); 
    f.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){System.exit(0);}
    });
  }
	
}