// Mandelbrot集合
/* <applet code="Ex060924a" width=300 height=230> </applet> */

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

public class Ex060924a extends JApplet implements ActionListener{
	dPan2 pl;
	JButton bt;
	boolean flag=false;
	public void init(){
		Container cp =getContentPane();
		pl = new dPan2();
		cp.setLayout(null);
		cp.setBackground(Color.black);
		pl.setBounds(0,30,300,200);
		bt = new JButton("計 算");
		bt.setBounds(0,0,80,20);
		cp.add(bt);
		bt.addActionListener(this);
		cp.add(pl);	
	}
	
	public void actionPerformed(ActionEvent event){
  	flag=true;
  	pl.init();
  }
	
	class dPan2 extends JPanel{
		double x; // 実部
		double y; // 虚部
		
		public void init(){
			Graphics g = getGraphics();
			paintComponent(g);
		}
	
		public void paintComponent(Graphics g){
		super.paintComponent(g);
		  double re,reb;
		  double im,imb;
			g.setColor(Color.black);
			g.fillRect(0,0,500,500);
			if(flag==true){
				g.setColor(Color.green);
				for(x=-2.0;x<=0.5;x=x+0.01){
					for(y=-1.2;y<=1.2;y=y+0.01){
						re=0.0;
						im=0.0;
						for(int i=0;i<100;i++){
							reb=re;
							imb=im;
							re=reb*reb-imb*imb+x;
							im=2*reb*imb+y;
						}
						if(Math.sqrt(re*re+im*im)<2.0)
							g.drawLine((int)(x*100)+200,100-(int)(y*100),(int)(x*100)+200,100-(int)(y*100));
					}
				}
			}		
		}
	}

	
}