// The copyright of this program is reserved by �N�L.
/* 
Weierstrass function
*/ 

/* <applet code="Ex061009c.class" width=600 height=320> </applet> */

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

public class Ex061009c extends JApplet implements ActionListener{
	boolean flag=false;
	double a=0.5; // Weierstrass function�̌W��
	double b=3.0; // Weierstrass function�̌W��
	double h=0.005;
  int num=0;
  JComboBox cb;
  String cbl[]={"n=0","n=1","n=2","n=3","n=4","n=5","n=6","n=7","n=8","n=9","n=10"};
	public void init(){
		Container cp = getContentPane();
		JPanel pl = new JPanel();
		pl.setBackground(Color.black);
    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){
		num = cb.getSelectedIndex(); 
		flag=true;
		repaint();
	}

	public void paint(Graphics g){
		super.paint(g);
		g.setColor(Color.blue);
		g.drawLine(20,160,600,160);
		g.drawLine(300,20,300,300);
		g.drawRect(20,20,560,280);
		g.setColor(Color.red);
		g.setFont(new Font("Dialog", Font.PLAIN,16));
		g.drawString("-7",5,170);
		g.drawString(" 7",580,170);
		g.drawString(" 7",295,20);
		g.drawString("-7",295,315);
		if(flag==true)
			for(double x=-7.0;x<7.0;x+=h){
		  	g.setColor(Color.green);
	 	  	g.drawLine((int)(x*40+300),160-(int)(Weierstrass(num,x)*80),(int)((x+h)*40+300),160-(int)(Weierstrass(num,x+h)*80));
			}	
	}

	public double Weierstrass(int n,double x){
		double val=0.0;
		for(int i=0;i<=n;i++)
			val+=Math.pow(a,i)*Math.cos(Math.pow(b,i)*x);
		return(val);
	}
	
}