// The copyright of this program is reserved by 哲猫.
/* 
Turtle Graphics / 樹木曲線
cf. Ex061010b.java
*/ 

/* <applet code="Ex061015b.class" width=400 height=400> </applet> */

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

public class Ex061015b extends JApplet implements ChangeListener{
	JSlider sl;
	double th,Leng;
	double minl=2.0;
	dTurtle t;
	JLabel  lb;
	public void init(){
		Container cp = getContentPane();
		JPanel pl = new JPanel();
    pl.setLayout(null);
		pl.setBackground(Color.black);
		sl = new JSlider(0,360,0);
		// sl.setMajorTickSpacing(60); // 大目盛りの間隔を設定
		sl.setMinorTickSpacing(20); // 小目盛りの間隔を設定
		sl.setPaintTicks(true); // 目盛りをスライダで表示するかどうかを設定
		sl.setBounds(20,5,360,20);
    sl.addChangeListener(this);
		sl.setOpaque(false);
		pl.add(sl);
		lb = new JLabel("θ = 0°");
		lb.setFont(new Font("Dialog", Font.BOLD, 18)); 
		lb.setForeground(Color.cyan);
		lb.setBounds(310,380,90,20);
		lb.setVisible(true);
		pl.add(lb);
		t = new dTurtle(200,350);
		t.setColor(Color.yellow);
		cp.add(pl);
	}
	
  public void stateChanged(ChangeEvent e){
		th = sl.getValue()/2.0;
		lb.setText("θ = "+th+"°");
		if(th>90)
			minl=4.0;
		else
			minl=2.0;	
		Leng=80.0;
		repaint();
	}
	
	public void paint(Graphics g){
		super.paint(g);
		tree(Leng,g);
	}
	
	public void tree(double length,Graphics g){
		if(length>45)
			t.setColor(Color.white);
		if(length<=45 && length>25)
			t.setColor(Color.red);
		if(length<=25 && length>14)
			t.setColor(Color.green);
		if(length<14 && length>8)
			t.setColor(Color.blue);
		if(length<8 && length>6)
			t.setColor(Color.orange);
		if(length<6 && length>3)
			t.setColor(Color.cyan);
		if(length<3)
			t.setColor(Color.yellow);
		t.move(length,g);
		if(length>minl){
			t.turn(th);
			tree(length*.75,g);
			t.turn(-th*2);
			tree(length*.75,g);
			t.turn(th);
	 }
		t.warp(-length);
	}
}