import java.applet.*;
import java.awt.*;
//copyright 2000 M Paez, U Antioquia, R landau, OSU//Author: Carlos E. Yaguna
//Departamento de Fisica
//Universidad de Antioquia
//Medellin COLOMBIA
//yaguna@pegasus.udea.edu.co
public class Fig2 extends Applet
{ 
        private Fig2Canv theCanvas;
        private Panel thePanel,p1,p2,p3;
        private Button b1,b2,b3;
        private Choice lista;
        private TextField t1;
	public double PI=3.141592;


	public void init()
	{
		int max;
		max=(int)360;
                t1=new TextField(3);
                lista=new Choice();
                lista.addItem("1-1");
                lista.addItem("1-2");
                lista.addItem("1-3");
                lista.addItem("1-4");
                lista.addItem("2-3");
                lista.addItem("3-4");
                lista.addItem("3-5");
                lista.addItem("4-5");
                lista.addItem("5-6");
                b1=new Button("Start");
                b2=new Button("Pause");
                b3=new Button("Stop");
                p1=new Panel();
                p2=new Panel();
                p3=new Panel();
                p1.setLayout(new GridLayout(1,4));
                p2.setLayout(new BorderLayout());
                theCanvas=new Fig2Canv();
		theCanvas.resize(400,400);
		theCanvas.setBackground(Color.yellow);
                p1.add(b1);
                p1.add(b2);
                p1.add(lista);
                p1.add(t1);
                //p1.add(b3);
                p2.add("North",p1);
		thePanel=new Panel();

		setLayout(new BorderLayout());
		thePanel.setLayout(new BorderLayout());

		thePanel.add("Center",theCanvas);
                thePanel.add("North",p2);
                add("Center",thePanel);
                theCanvas.part=120;
                theCanvas.max=10;
                theCanvas.ii=0;
                theCanvas.lis0();
                theCanvas.init();
                theCanvas.start();

	}
        public boolean action(Event e,Object o)
	{
                if(e.target instanceof TextField){
                 if(e.target==t1){
                  theCanvas.desf2=Double.valueOf(t1.getText()).doubleValue();
                  theCanvas.repaint();
                  }
                 return true;
                }
                if(e.target==lista){
                 if(lista.getSelectedIndex()==0)theCanvas.lis0();
                 if(lista.getSelectedIndex()==1)theCanvas.lis1();
                 if(lista.getSelectedIndex()==2)theCanvas.lis2();
                 if(lista.getSelectedIndex()==3)theCanvas.lis3();
                 if(lista.getSelectedIndex()==4)theCanvas.lis4();
                 if(lista.getSelectedIndex()==5)theCanvas.lis5();
                 if(lista.getSelectedIndex()==6)theCanvas.lis6();
                 if(lista.getSelectedIndex()==7)theCanvas.lis7();
                 if(lista.getSelectedIndex()==8)theCanvas.lis8();
                 theCanvas.desf2=0.0;
                }
                if(e.target instanceof Button){

                        if(e.target==b1){
                                theCanvas.ii=1;
                                theCanvas.repaint();
			}
                        if(e.target==b2){
                                if(theCanvas.ii==1){
                                theCanvas.ii=0;
                                theCanvas.repaint();
                                }
			}
			return true;
		}
		
                return true;
        }
}

class Fig2Canv extends Canvas implements Runnable{
        double ome1,ome2,desf,desf2,part,max;
        double PI=3.141592,tt;
        int ii,xp,yp;
        Thread runstring;
        private Image offScreenImage;

        public void init()
        {
        tt=0.0;
        //max=10;
        //part=120;
        //ii=1;
        offScreenImage=createImage(size().width,size().height);
        }


	public void setOme1(int w)
	{  ome1=(w*PI/180.0);}

	public void setOme2(int h)
	{ ome2=(h*PI/180.0);}

        public void setDesf(double j)
	{desf=(j*PI/180.0);}

        
  public void start()
  {
    if(runstring==null);
    {
     runstring=new Thread(this);
     runstring.start();
    }

  }
  public void stop()
  {
     if(runstring != null){
       runstring.suspend();
       runstring=null;
     }

  }
  public void run()
  {
    while(true){ if(ii==1)
                 repaint();

      try{ Thread.sleep(300);
		  
      }
      catch(InterruptedException e){ }
    
	 
	}           

  }

    public void update(Graphics g)
  { //To avoid flicker
    Graphics offScreenGraphics=offScreenImage.getGraphics();
    offScreenGraphics.setColor(getBackground());
    offScreenGraphics.fillRect(0,0,size().width,size().height);
    offScreenGraphics.setColor(g.getColor());
    paint(offScreenGraphics);
    g.drawImage(offScreenImage,0,0,this);
  }
          void coordenadas(double x,double y)
   {
    int width,height,xpcero,ypcero;
    double ymmax,xmmax;
    width=200;//ancho del Canvas
    height=200;//altura
    xmmax=1;//coordenada de mundo maxima para x
    xpcero=100;//coordenada de pantalla para el punto medio
    ymmax=1;
    ypcero=100;
    xp=(int)(xpcero+(width-xpcero)/xmmax*x);
    yp=(int)(ypcero+((-height+ypcero)/ymmax*y));
    }
     public void lis0()
      {
       setOme1(120);
       setOme2(120);
       max=3;
       part=120;
       repaint();
      }

      public void lis1()
      {
       setOme1(240);
       setOme2(120);
       max=10;
       part=120;
       repaint();
      }
        public void lis2()
      {
       setOme1(120);
       setOme2(40);
       max=10;
       part=120;
       repaint();
      }
         public void lis3()
      {
       setOme1(120);
       setOme2(30);
       max=20;
       part=120;
       repaint();
      }
        public void lis4()
      {
       setOme1(120);
       setOme2(80);
       max=10;
       part=120;
       repaint();
      }
        public void lis5()
      {
       setOme1(120);
       setOme2(160);
       max=10;
       part=120;
       repaint();
      }
          public void lis6()
      {
       setOme1(120);
       setOme2(200);
       max=9;
       part=200;
       repaint();
      }

         public void lis7()
      {
       setOme1(120);
       setOme2(150);
       max=20;
       part=200;
       repaint();
      }

        public void lis8()
      {
       setOme1(180);
       setOme2(150);
       max=20;
       part=200;
       repaint();
      }

      public void plot (Graphics g)
	{
                double i;
                double xm,ym,x1,y1;
                //max=10;
                //part=120;
		x1=50;
		y1=50;
                setDesf(desf2);
		g.setColor(Color.black);
                tt=0.0;
                for(i=0;i<max;i+=max/part){
                        xm=Math.sin(ome1*tt);
                        ym=Math.sin(ome2*tt+desf);
                        coordenadas(xm,ym);
                        xp+=60;
                        yp+=70;
                        if(i>0)g.drawLine((int)x1,(int)y1,(int)xp,(int)yp);
			x1=xp;
			y1=yp;
                        tt=tt+max/part;
                 }

	}
        public void grafica(Graphics g)
        {
          int xi,yi,xc,yc,r;
          xc=30;
          yc=30;
          r=10;
          g.setColor(Color.red);
          g.drawOval(xc-r,yc-r,2*r,2*r);
          xi=(int)(xc+r*Math.cos(desf));
          yi=(int)(yc-r*Math.sin(desf));
          g.setColor(Color.blue);
          g.drawLine(xc,yc,xi,yi);
        }



        public void paint(Graphics g)
        {
         plot(g);
         grafica(g);
         if(ii==1)desf2+=5;
         if(desf2%360==0)desf2=0;
        }

		
	}