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

/* <applet code="Ex061010g.class" width=500 height=400> </applet> */

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

public class Ex061010g 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","n=8","n=9","n=10","n=11","n=12","n=13"};
	double Len[]={300.0,200.0,120.0,80.0,60.0,40.0,27.0,20.0,14.0,10.0,7.0,5.0,3.5};	
	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;
		length=Len[order-1];
		t.setColor(Color.yellow);
		t.setPos(60.0,150.0);
		t.setAng(0.0);
		flag=true;
		repaint();
	}
	
	public void paint(Graphics g){
		super.paint(g);
		if(flag==true)
			Dragon(order,45.0,g);
	}
	
	public void Dragon(int order, double angle,Graphics g){
		if(order==0)
			t.move(length,g);
		else{
			t.turn(-angle);
			Dragon(order-1,-45.0,g);
			t.turn(2*angle);
			Dragon(order-1,45.0,g);
			t.turn(-angle);
		}
	}
}