// The copyright of this program is reserved by �N�L.
/* 
Turtle Graphics : Koch �Ȑ�
*/ 

/* <applet code="Ex061010d.class" width=500 height=200> </applet> */

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Ex061010d extends JApplet implements ActionListener{
	dTurtle t;
	boolean flag=false;
	double length;
	int order;
	JComboBox cb;
	String cbl[]={"n=1","n=2","n=3","n=4","n=5","n=6","n=7"};	
	public void init(){
		Container cp = getContentPane();
		JPanel pl = new JPanel();
		pl.setBackground(Color.black);
		t = new dTurtle();
    pl.setLayout(null);
    cb = new JComboBox(cbl);
    cb.setBounds(0,0,60,20);
    cb.setSelectedIndex(0);
    cb.addActionListener(this);
		pl.add(cb);		
		cp.add(pl);
	}
	
	public void actionPerformed(ActionEvent event){
		order = cb.getSelectedIndex()+1;
		double m =Math.pow(3,(double)order);
		length=490.0/m;
		t.setColor(Color.yellow);
		t.setPos(0.0,195.0);
		t.setAng(0.0);
		flag=true;
		repaint();
	}
	
	public void paint(Graphics g){
		super.paint(g);
		if(flag==true)
			koch(order,length,g);
	}
	
	public void koch(int order, double length,Graphics g){
		if(order==0)
			t.move(length,g);
		else{
			koch(order-1,length,g);
			t.turn(60);
			koch(order-1,length,g);
			t.turn(-120);
			koch(order-1,length,g);
			t.turn(60);
			koch(order-1,length,g);
		}
	}
}