import java.awt.*;
import java.applet.*;
import java.awt.image.*;
//copyright 2000 M Paez, U Antioquia, R landau, OSU//author Carlos Esteban Yaguna
//Departamento de Fisica
//Universidad de Antioquia
//Medellin, Colombia
//yaguna@pegasus.udea.edu.co
public class Fotoel extends Applet
{
  private FotCanva theCanvas;
  private Panel p1,p2,p3,p4;
  private Button equi,bor,agr,quitar;
  private CheckboxGroup radio;
  private Checkbox radio1,radio2;
  private int xini;
  private TextField text1,text2,text3;
  private Label l1,l2,l3;
  private Choice lista,lista2;
  private AudioClip sound;
  private Scrollbar s1,s2,s3;
  private FotFrame f;

  public void init()
  {
   sound=getAudioClip(getDocumentBase(), "drip.au");
   xini=0;
   theCanvas=new FotCanva();
   theCanvas.resize(300,300);
   theCanvas.setBackground(Color.black);
   p1=new Panel();
   p2=new Panel();
   p3=new Panel();
   p4=new Panel();
   lista=new Choice();
   lista2=new Choice();
   lista.addItem("Metal");
   lista.addItem("Na");
   lista.addItem("Al");
   lista.addItem("Co");
   lista.addItem("Cu");
   lista.addItem("Zn");
   lista.addItem("Ag");
   lista2.addItem("F(z)=z^2");
   lista2.addItem("F(z)=1/z");
   lista2.addItem("F(z)=sqrt(z)");
   lista2.addItem("F(z)=z+1/z");
   lista2.addItem("F(z)=ze^ia");
   lista2.addItem("F(z)=z^3/2");
   text1=new TextField(3);
   text2=new TextField(3);
   text3=new TextField(3);
   l1=new Label("Inicial:");
   l2=new Label("Delta: ");
   l3=new Label("Numero:");
   equi=new Button("On");
   bor=new Button("Off");
   agr=new Button("Plot");
   quitar=new Button("Retirar");
   radio=new CheckboxGroup();
   radio1=new Checkbox("Proton",radio,true);
   radio2=new Checkbox("Electron",radio,false);
   s1=new Scrollbar(Scrollbar.VERTICAL,100,0,0,200);
   s2=new Scrollbar(Scrollbar.HORIZONTAL,10,0,0,300);
   s3=new Scrollbar(Scrollbar.HORIZONTAL,10,0,0,200);
   p1.setLayout(new GridLayout(8,1));
   p2.setLayout(new GridLayout(6,1));
   p3.setLayout(new BorderLayout());
   p4.setLayout(new GridLayout(1,2));
   p2.add(l1);
   p2.add(text1);
   p2.add(l2);
   p2.add(text2);
   p2.add(l3);
   p2.add(text3);
   p1.add(equi);
   p1.add(bor);
   p1.add(agr);
   //p1.add(quitar);
   //p1.add(radio1);
   //p1.add(radio2);
   p1.add(lista);
   //p1.add(lista2);
   p3.add("Center",p1);
   //p3.add("South",p2);
   //p3.add("West",s3);
   p4.add(s2);
   p4.add(s3);
   setLayout(new BorderLayout());
   add("East",p3);
   add("Center",theCanvas);
   add("West",s1);
   add("South",p4);
   
   theCanvas.init();
   theCanvas.start();
   theCanvas.repaint();
  }
  
   public boolean handleEvent(Event e){

      if(e.target instanceof Scrollbar){

        if(e.target==s1){
          theCanvas.freq=1e13*s1.getValue();
          showStatus("Frecuencia de " + String.valueOf(e.arg));
          }
        if(e.target==s2){
          theCanvas.volt=1e-2*s2.getValue();
          showStatus("Voltaje de " + String.valueOf(e.arg)+"^-2");
          }
        if(e.target==s3){
          theCanvas.inten=s3.getValue();
          showStatus("Intensidad de " + String.valueOf(e.arg));
          }
        theCanvas.repaint();
			
			return true;
		}
		
		return super.handleEvent(e);
        }


  public boolean action(Event e, Object o)
  {
   if(e.target instanceof Button){
   sound.play();
   if(e.target == equi){theCanvas.bb=1;
     theCanvas.repaint();
     return true;}

   if(e.target==bor){
     theCanvas.bb=0;
     theCanvas.repaint();
     //theCanvas.ii=1;
     return true;}

    if(e.target==agr){
     String s="Experimental Values";
      if(f!=null){
        f.hide();
        f.dispose();
       }
      f=new FotFrame(s);
      f.resize(400,200);
      f.setBackground(Color.white);
      f.setResizable(false);
      f.show();
     }
     /*
    if(e.target==quitar){
     theCanvas.Nmax=0;
     theCanvas.bb=0;
     theCanvas.repaint();
     }  */
   return false;
   }
  /*
   if(e.target instanceof Checkbox){
    if(radio1.getState()==true)theCanvas.col=1;
    if(radio2.getState()==true)theCanvas.col=-1;
    return true;
    }
   if(e.target instanceof TextField){
    if(e.target==text1)
     theCanvas.dpot[0]=Double.valueOf(text1.getText()).doubleValue();
    if(e.target==text2)
     theCanvas.dsum=Double.valueOf(text2.getText()).doubleValue();
    if(e.target==text3)
     theCanvas.num=Integer.parseInt(text3.getText());
     theCanvas.promedio();
     return true;
    } */
   if(e.target instanceof Choice){
    if(e.target==lista){
    if(lista.getSelectedIndex()==1)theCanvas.trab=2.28;
    else if(lista.getSelectedIndex()==2)theCanvas.trab=4.08;
    else if(lista.getSelectedIndex()==3)theCanvas.trab=3.9;
    else if(lista.getSelectedIndex()==4)theCanvas.trab=4.7;
    else if(lista.getSelectedIndex()==5)theCanvas.trab=4.31;
    else if(lista.getSelectedIndex()==6)theCanvas.trab=4.73;
    theCanvas.trab*=1.6e-19;
    theCanvas.repaint();
    }
   /*
    if(e.target==lista2){
     if(lista2.getSelectedIndex()==0){
      theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=1;
      }
    else if(lista2.getSelectedIndex()==1){
      theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=2;
      }
    else if(lista2.getSelectedIndex()==2){
      theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=3;
      }
     else if(lista2.getSelectedIndex()==3){
      theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=4;
      }
      else if(lista2.getSelectedIndex()==4){
      theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=5;
      }
      else if(lista2.getSelectedIndex()==5){
       theCanvas.func1();
      theCanvas.nn=1;
      theCanvas.fun=6;
      }
     }*/
    theCanvas.repaint();
    return true;
    }
    return false;
   }

 }
 class FotCanva extends Canvas implements Runnable{
  public double volt,e,h;
  int n,xp,yp,bb,paso,var2;
  double freq,inten,trab;
  Thread hilo;
  Image offScreenImage;


  public void init()
  {
   bb=0;
   freq=100e13;
   trab=2.28*1.6e-19;
   inten=10.0;
   e=1.6e-19;
   volt=0.1;
   paso=0;
   h=6.62e-34;
   offScreenImage=createImage(size().width,size().height);
  }
    
  public void start()
  {
    if(hilo==null);
    {
     hilo=new Thread(this);
     hilo.start();
    }

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

  }
  public void run()
  {
    while(true){ if(bb==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);
  }

   public void electron(Graphics g)
   {
    int i,j,pa,var;
    if(inten<50)var2=8;
    else if(inten<100)var2=6;
    else if(inten<150)var2=4;
    else var2=3;
    
    if(h*freq-trab>=e*volt){
    g.setColor(Color.green);
    for(i=60;i<90;i+=var2)
      for(pa=50;pa<250;pa+=6){
      var=paso+pa;
      if(var>250)var-=196;
      g.fillOval(var,i,2,2);
      }
    }

   }

    public void plot(Graphics g)
  {
   int i,volti;
   double ang,var1,var2;
   /*g.setColor(Color.lightGray);
   g.fillRect(50,50,200,50);
   g.fillArc(20,50,60,50,90,180);
   g.fillArc(220,50,60,50,90,-180);
   */
   g.setColor(Color.yellow);
   g.drawLine(50,60,50,90);
   g.drawLine(250,60,250,90);
   g.drawLine(50,75,15,75);
   g.drawLine(250,75,285,75);
   g.drawLine(15,75,15,175);
   g.drawLine(285,75,285,175);
   g.drawLine(15,175,60,175);
   g.drawLine(285,175,240,175);
   g.drawLine(110,175,210,175);
   g.drawLine(240,160,240,190);
   g.drawLine(210,155,210,195);

   g.setColor(Color.cyan);
   g.drawOval(60,150,50,50);
   
   for(i=0;i<12;i++){
    ang=30.0*i*3.1416/180.0;
    var1=Math.cos(ang);
    var2=Math.sin(ang);
    g.drawLine((int)(85+22.0*var1),(int)(175+22.0*var2),(int)(85+25.0*var1),(int)(175+25.0*var2));
   }
   volti=(int)(volt*100);
   volt=volti/100.0;
   g.setColor(Color.lightGray);
   g.setFont(new Font("TimesRoman",Font.PLAIN,12));
   g.drawString("Amperimeter",55,215);
   g.drawString(Double.toString(volt),215,175);
   g.drawString("+",200,155);
   g.drawString("-",245,160);
   g.setColor(Color.red);
   g.drawLine(50,50,250,50);
   g.drawLine(50,100,250,100);
   g.drawLine(51,51,250,51);
   g.drawLine(51,101,250,101);
   g.drawArc(20,50,60,50,90,180);
   g.drawArc(220,50,60,50,90,-180);
   g.drawArc(21,50,60,50,90,180);
   g.drawArc(221,50,60,50,90,-180);

   luz(g);
   }
   public void luz(Graphics g)
   {
    int i,j;
    double dist,var;
    g.setColor(Color.lightGray);
    g.drawString(Double.toString(freq*1e-13)+"e13 Hz",115,30);
    g.setColor(Color.pink);
    //g.fillOval(100,20,10,10);
    g.fillArc(100,10,20,20,200,50);
    g.setColor(Color.white);
    if(bb==1)
    for(i=0;i<10;i++){
     g.drawLine(105,25,50,60+i*3);
     dist=Math.sqrt(Math.pow(110-50,2.0)+Math.pow(30-60+i*3,2.0));
     }
    }
   public void corriente(Graphics g)
   {
    double pos,fac,var1,var2;
    h=6.62e-34;
    var1=2e11;
    var2=0.8;
    pos=0.0;
    if(bb==0)pos=0.0;
    else if(bb==1){
    if(h*freq-trab<=e*volt)pos=0.0;
    else{
    fac=var1*Math.sqrt(h*freq-trab-e*volt);
    pos=fac+var2*inten;
    }
    }
    pos*=3.14/180;
    g.setColor(Color.magenta);
    //g.drawString("pos = "+Double.toString(pos),200,200);
    g.drawLine(85,175,(int)(85+20*Math.cos(pos)),(int)(175-20*Math.sin(pos)));

   }
   public void paint(Graphics g)
   {
      int var,i;
      plot(g);
      corriente(g);
      g.setColor(Color.blue);
      for(i=0;i<5;i++)
      g.drawRect(0+i,0+i,306-2*i,234-2*i);
      if(bb==1){
      electron(g);
      var=(int)(3e11*Math.sqrt(h*freq-trab-e*volt));
      if(var<75)paso+=1;
      else if(var<150)paso+=3;
      else if(var<225)paso+=5;
      else paso+=7;
      if(paso>=200)paso=0;
       
      }
   }
 }

  class FotFrame extends Frame{
    private Button b1;
    private Label l1,l2,l3;
    private TextField t1,t2,t3,t4,t5,t6,t7,t8;
    private Panel p1,p2,p3;
    private FotCanvas2 theCanvas2;
    String name;
    int num;

    public FotFrame(String s)
    {
     super(s);
     theCanvas2=new FotCanvas2();
     theCanvas2.resize(200,200);
     theCanvas2.setBackground(Color.orange);
     b1=new Button("Plot");
     l1=new Label("Freq.(e13Hz)");
     l2=new Label("  Volt.(V)");
     t1=new TextField(3);
     t2=new TextField(3);
     t3=new TextField(3);
     t4=new TextField(3);
     t5=new TextField(3);
     t6=new TextField(3);
     t7=new TextField(3);
     t8=new TextField(3);
     p1=new Panel();
     p2=new Panel();
     p1.setLayout(new GridLayout(5,2));
     p2.setLayout(new BorderLayout());
     p1.add(l1);
     p1.add(l2);
     p1.add(t1);
     p1.add(t2);
     p1.add(t3);
     p1.add(t4);
     p1.add(t5);
     p1.add(t6);
     p1.add(t7);
     p1.add(t8);
     p2.add("Center",p1);
     p2.add("South",b1);
     add("West",p2);
     add("Center",theCanvas2);
     theCanvas2.init();
   }
 
 public boolean handleEvent(Event e)
 {
  if(e.id==Event.WINDOW_DESTROY){
   hide();
   dispose();
   return true;
  }
  return super.handleEvent(e);
 }
 
 public boolean action(Event e, Object o)
 {
  if(e.target==b1){
   theCanvas2.bb=1;
   theCanvas2.freq[0]=Double.valueOf(t1.getText()).doubleValue();
   theCanvas2.volt[0]=Double.valueOf(t2.getText()).doubleValue();
   theCanvas2.freq[1]=Double.valueOf(t3.getText()).doubleValue();
   theCanvas2.volt[1]=Double.valueOf(t4.getText()).doubleValue();
   theCanvas2.freq[2]=Double.valueOf(t5.getText()).doubleValue();
   theCanvas2.volt[2]=Double.valueOf(t6.getText()).doubleValue();
   theCanvas2.freq[3]=Double.valueOf(t7.getText()).doubleValue();
   theCanvas2.volt[3]=Double.valueOf(t8.getText()).doubleValue();
   theCanvas2.repaint();
  }
   return true;
 }
}
 class FotCanvas2 extends Canvas{
   double freq[],volt[];
   int num,xp,yp,bb;

  public void init()
  {
   bb=0;
   freq=new double[4];
   volt=new double[4];
  }
  void coordenadas(double x,double y)
   {
    int width,height,xpcero,ypcero;
    double ymmax,xmmax;
    width=200;//ancho del Canvas
    height=150;//altura
    xmmax=220;//coordenada de mundo maxima para x
    xpcero=30;//coordenada de pantalla para el punto medio
    ymmax=1.5;
    ypcero=100;
    xp=(int)(xpcero+(width-xpcero)/xmmax*x);
    yp=(int)(ypcero+((-height+ypcero)/ymmax*y));
    }


  public void paint(Graphics g){
   int x1,y1,i,xma,xmi,peni;
   double yma,ymi,pen;
   g.setFont(new Font("TimesRoman", Font.PLAIN,10));
   g.setColor(Color.blue);
   coordenadas(-10,0);
   x1=xp;
   y1=yp;
   coordenadas(190,0);
   g.drawLine(x1,y1,xp,yp);
   g.drawString("x10^13Hz",xp+6,yp+12);
   coordenadas(0,-0.2);
   x1=xp;
   y1=yp;
   coordenadas(0,2.7);
   g.drawLine(x1,y1,xp,yp);
   g.drawString("V",xp-12,yp);
   coordenadas(30,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("30",xp-4,yp+12);
   coordenadas(60,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("60",xp-4,yp+12);
   coordenadas(90,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("90",xp-4,yp+12);
   coordenadas(120,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("120",xp-6,yp+12);
   coordenadas(150,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("150",xp-6,yp+12);
   coordenadas(180,0);
   g.drawLine(xp,yp-3,xp,yp+3);
   g.drawString("180",xp-6,yp+12);
   coordenadas(0,1);
   g.drawLine(xp-3,yp,xp+3,yp);
   g.drawString("1",xp-20,yp+5);
   coordenadas(0,2);
   g.drawLine(xp-3,yp,xp+3,yp);
   g.drawString("2",xp-20,yp+5);
   xma=0;
   xmi=0;
   yma=0;
   ymi=5;
   if(bb==1){
   g.setColor(Color.gray);
   for(i=0;i<4;i++){
   coordenadas(freq[i],volt[i]);
   if(volt[i]>yma){yma=volt[i];xma=i;}
   if(volt[i]<ymi){ymi=volt[i];xmi=i;}
   g.fillOval(xp,yp,6,6);
   }
   coordenadas(freq[xma],volt[xma]);
   x1=xp;
   y1=yp;
   coordenadas(freq[xmi],volt[xmi]);
   g.setColor(Color.white);
   g.drawLine(x1+3,y1+3,xp+3,yp+3);
   pen=(volt[xma]-volt[xmi])/(freq[xma]-freq[xmi])/1.0e13;
   pen*=1.6e-19;
   peni=(int)(pen*1.0e36);
   pen=peni/100.0;
   g.setColor(Color.black);
   g.setFont(new Font("TimesRoman",Font.BOLD,16));
   g.drawString("h = "+Double.toString(pen)+"e-34 js",50,130);
  }
  }

 }