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


public class treeParametro4 extends Applet {

   Dimension d;
   Panel p;
  
   TextField nTextField, sTextField, aTextField;
   Button boton1,boton2,boton3;
 
   double L;                      // tamanio del arbol

   double t0 = 90.0 * (Math.PI/180.0);
   double t1 = 60.0 * (Math.PI/360.0);
   double t2;    // = 20.0 * (Math.PI/180.0);  // 30


   double dd, ang;
   double t;
   int n;
   double dx = 0.7;  // tamanio(largo) de las ramitas
   double dy = 0.7;
   int angle = 30;
   double z = Math.sqrt((dx*dx+dy*dy)/2.0);
   int w, h;
   
 
 public void init (){
   w = getSize().width;
   h = getSize().height;
   L = 180.0;
   
   init_panel();
 }
 
 void init_panel(){

   

   String ar = getParameter ("angle");
   if (ar == null){
      t2=0*(Math.PI/180.0);
   }
   else t2 = Double.valueOf(ar).doubleValue();
   
   p = new Panel();
   p.add(new Label("分岐回数"));
   p.add(nTextField = new TextField("2"));
   p.add(boton1 = new Button("Change 1"));

   p.add(new Label("生長する枝"));
   p.add(sTextField = new TextField("0.7"));
   p.add(boton2 = new Button("Change 2"));   
   
   p.add(new Label("枝の角度"));
   p.add(aTextField = new TextField("20")); 
   p.add(boton3 = new Button("Change 3"));

   p.setBackground(Color.pink);
   setLayout(new BorderLayout());
   add("North",p);   

   boton1.addActionListener ( new java.awt.event.ActionListener ()
      {
        public void actionPerformed (ActionEvent e)
        {
          n= Integer.parseInt(nTextField.getText());      // numero
          repaint();
        }
       });
    
   boton2.addActionListener ( new java.awt.event.ActionListener ()
      {
        public void actionPerformed (ActionEvent e)
        {
          dd = Double.valueOf(sTextField.getText()).doubleValue();   // escala
          repaint();
        }
       });

   boton3.addActionListener ( new java.awt.event.ActionListener ()
      {
        public void actionPerformed (ActionEvent e)
        {
          t2 = (Double.valueOf(aTextField.getText()).doubleValue())*(Math.PI/360.0);   // angulo
          repaint();
        }
       });
 } 


 

 public void paint (Graphics g){
   int x0, y0;
   x0= w/2;
   y0= 0;   
   g.setColor(Color.white);
   g.fillRect(0,0,w,h);
   write_node(g, n, L, t0, 0, 0);

 }



 public void write_node (Graphics g, int n, double l, double arg, int x, int y){

   int xx, yy,i;
   xx = (int)(l * Math.cos(arg) * dd);
   yy = (int)(l * Math.sin(arg) * dd);
   g.setColor(Color.blue);
   g.drawLine (300+x,  500-y, 300+(x+xx) , 500-(y+yy)); 

   
   if (n>0){
       
       write_node(g, n-1, l*z, (arg + t2/2.0) + 0.0*t2/1.0, x+xx, y+yy);
       write_node(g, n-1, l*z, (arg + t2/2.0) + 1.0*t2/1.0, x+xx, y+yy);

   }

 }

}