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


public class welle3 extends Applet
	{
	int Start=1;
	Button f1 = new Button("Stop");
	Scrollbar Frequenz = new Scrollbar(Scrollbar.HORIZONTAL,6,1,1,31);
  Scrollbar Anzahl = new Scrollbar(Scrollbar.HORIZONTAL,1,1,1,10);

	double omega=0.6;	//Gibt Frequenz an
	double anzahl=1;      //Gibt Anzahl der Erreger an

  boolean anhalten;
	painter canvas;  //initialisiert Zeichenflaeche
  wellen wellen1;
  wellen wellen2;
  wellen wellen3;
  wellen wellen4;
  wellen wellen5;
  wellen wellen6;
  Zeiger zeiger1;

	Panel raster = new Panel();
	Label s1 = new Label("Frequenz",Label.RIGHT);
	Label s2 = new Label("0.6");
	Label s3 = new Label("Anzahl der Erreger",Label.RIGHT);
	Label s4 = new Label("1");

	double sb1value=0; //Scrollbarvariable
	double sb2value=0; //Scrollbarvariable

  double t=0.0;
  double t_neu=0.0;

	int[] x = new int[10];
	int[] y = new int[10];
	final double pi=3.14;


  public welle3()
    {

    canvas = new painter();
    canvas.setForeground(Color.black);
    canvas.setBackground(Color.white);
    canvas.setSize(630,300);
    setLayout(new FlowLayout());
		add(canvas);

    Label info1 = new Label("(c) 1998 by Jörg Bogendörfer",Label.LEFT);
		Label info2 = new Label("Didaktik der Physik, Uni Erlangen ",Label.RIGHT);
		info1.setForeground(Color.white);
		info2.setForeground(Color.white);

		raster.setLayout(new GridLayout(4,3,10,5));


   		raster.setForeground(Color.black);
   		raster.setBackground(Color.white);

   		raster.add(s1);
		raster.add(Frequenz);
		raster.add(s2);
		raster.add(s3);
		raster.add(Anzahl);
		raster.add(s4);
		raster.add(info1);
		raster.add(f1);
		raster.add(info2);

		add(raster);

		Frequenz.addAdjustmentListener(new Scrolling());
		Anzahl.addAdjustmentListener(new Scrolling());

		f1.addActionListener(new Akt());
    }


	public static void main(String[] args)
		{

		Frame fenster = new Frame("Zur Wellenfunktion");;


			class adapt extends WindowAdapter
			{
			public void windowClosing(WindowEvent e)
				{
				System.exit(0);
				}
			}

		fenster.addWindowListener(new adapt());
		welle3 test = new welle3();

		test.init();
		test.start();
		fenster.add(test);
  		fenster.setBackground(Color.white);
  		fenster.setForeground(Color.black);
		fenster.setBounds(100,80,670,450);
		fenster.setResizable(false);
		fenster.show();
		} //Ende von main



	public void init()
		{
      wellen1 = new wellen(canvas);

      zeiger1 = new Zeiger(canvas,0);

      wellen1.beenden = false;
      zeiger1.beenden = false;

      wellen1.anhalten = true;
      zeiger1.anhalten = true;

      wellen1.start();
      zeiger1.start();

      }     // Ende von init


      public void start()
        {

        synchronized(wellen1)
          {
          wellen1.anhalten = false;

          try
            {
            wellen1.notify();
            }

          catch(Exception e){}
          }



          synchronized(zeiger1)
          {
          zeiger1.anhalten = false;

          try
            {
            zeiger1.notify();
            }

          catch(Exception e){}
          }



         }  // Ende von Start



    public void stop()
      {
      if(wellen1 != null && zeiger1 != null)
        {
        wellen1.anhalten = true;
        zeiger1.anhalten = true;
         }
        }

     public void destroy()
       {
      if(wellen1 != null && zeiger1 != null)

        {
        wellen1.anhalten = true;
        zeiger1.anhalten = true;

         }
        }



		class Akt implements ActionListener
			{
			public void actionPerformed(ActionEvent e)
				{
				String Label;

		    		Label = e.getActionCommand();

			    	if(Label.equals("Start"))
					{
					Start=1;
					f1.setLabel("Stop");
          omega=Frequenz.getValue()/10.0;
          wellen1.resume();
          zeiger1.resume();
					}




			       if(Label.equals("Stop"))
					{
					Start=0;
					f1.setLabel("Start");
          wellen1.suspend();
          zeiger1.suspend();
          
					}

				}
			} //Ende von Actionlistener



		class Scrolling implements AdjustmentListener
			{
			public void adjustmentValueChanged(AdjustmentEvent e)
				{
       			sb1value=Frequenz.getValue();
    				sb2value=Anzahl.getValue();


				omega=sb1value/10.0;

				anzahl=sb2value;

				double s2value = omega;
				int s4value = (int) anzahl;
    				s2.setText("" + sb1value/10.0);
     				s4.setText("" + s4value);
            zeiger1.resume();
            wellen6.resume();
            Start=1;
            f1.setLabel("Stop");
            canvas.repaint();
            	}

			}


	class wellen extends Thread

		{

      boolean anhalten,beenden; //Statusvariablen
      painter bild;
      double dt = 0.002;
      int x1=500;
      int y1=120;


			wellen(painter c) //Konstruktor anlegen
			{
       bild=c;

  		}

    public void run() //run Methode fuer die Threads
      {

      while(beenden==false)
        {
        Bewegen(); //Ein Stueckchen drehen

        synchronized(this)
          {
          try
            {
            sleep(20);

            if(anhalten==true)
              {
              wait();
              }
             }
           catch(InterruptedException e) {return;}
           }
          }
        }


		void Bewegen()

		{
    //double t_neu;


    Graphics g = bild.getGraphics();


      int l=0;
      g.setColor(Color.white);

        g.fillRect(328,240,100,100);
        g.fillRect(5,5,350,280);
        g.fillRect(432,51,133,133);

      g.setColor(Color.black);
      g.drawLine(37,34,37,264);
      g.drawLine(37,264,450,264);
      g.fillOval(35,262,5,5);
      g.fillOval(348,262,5,5);



      t_neu=t+dt;

      g.setColor(Color.black);
        g.fillOval(348,262,5,5);

      double k=0.0;
       for(k=0.0; k<=anzahl-1; k++)
        {
        int i = (int) k;

        if(i==0)
          {
           x1=500;
           y1=120;
           }

           
      x[i]=(int) (20*(Math.cos((t_neu*2*pi*omega)+((k/10.0)*2*pi))));
		  y[i]=(int) (-20*(Math.sin((t_neu*2*pi*omega)+((k/10.0)*2*pi))));
      g.setColor(Color.black);
      g.fillOval(35,262-25*i,5,5);
      g.fillOval(498,118,5,5);
      if(i>=1)
        {
      g.setColor(new Color(180,180,180));
      g.drawLine(37,264-25*i,350,264);
        }
      g.setColor(Color.black);
      g.fillOval(35,262-25*i,5,5);
      g.setColor(Color.white);
      g.fillRect(330,244,20,20);
      g.setColor(new Color(255-(i*25),i*25,i*25));
      g.drawLine(350,264,350+x[i],262+y[i]);
      g.drawLine(37,264-25*i,37+x[0],264-(25*i)+y[0]);

      g.drawLine(x1,y1,x1+x[i],y1+y[i]);

      if(i==anzahl-1)
        {
      g.setColor(Color.black);
      g.drawLine(x1+x[i],y1+y[i],500,120);
        }
      x1=x1+x[i];
      y1=y1+y[i];
         }

      






      t=t_neu;
      g.dispose();

		} //Ende von draw




		} //Ende der Klasse wellen

     class painter extends Canvas
      {
      public void paint(Graphics g)
        {
        g.setColor(Color.black);
		    g.drawLine(0,0,629,0);
	     	g.drawLine(629,0,629,299);
	     	g.drawLine(629,299,0,299);
	    	g.drawLine(0,299,0,0);

        g.drawLine(37,34,37,264);
        g.drawLine(37,264,450,264);
        g.fillOval(35,262,5,5);
        g.fillOval(348,262,5,5);


        g.drawRect(431,50,135,135);



        }    //Ende von Paint

      } // Ende von painter



     class Zeiger extends Thread

		{

      boolean anhalten,beenden; //Statusvariablen
      painter bild;
      double dt = 0.002;
      int i=0;

			Zeiger(painter c, int k) //Konstruktor anlegen
			{
       bild=c;
       i=k;
  		}

    public void run() //run Methode fuer die Threads
      {

      while(beenden==false)
        {
        Bewegen(); //Ein Stueckchen drehen

        synchronized(this)
          {
          try
            {
            sleep(20);

            if(anhalten==true)
              {
              wait();
              }
             }
           catch(InterruptedException e) {return;}
           }
          }
        }


		void Bewegen()

		{

    int x,y;


    Graphics g = bild.getGraphics();



      g.setColor(Color.white);
      g.fillRect(315,25,65,65);

      int laenge=1;

      x=(int) (30*(Math.cos((t_neu*2*pi*omega)+(30)/laenge*2*pi)));
			y=(int) (-30*(Math.sin((t_neu*2*pi*omega)+(30)/laenge*2*pi)));

      g.setColor(Color.black);
      g.fillOval(343,53,5,5);
      g.setColor(Color.blue);
      g.drawLine(345,55,345+x,55+y);
      g.setColor(Color.red);
      g.drawLine(345,55,345,55+y);

      g.setColor(Color.darkGray);
      g.drawLine(345,55+y,345+x,55+y);
      g.dispose();

		} //Ende von draw




		} //Ende der Klasse Zeiger




	} //Ende von welle1