画正弦曲线

//画正弦曲线程序

import Java.applet. *;

import java.awt.*;

import java.awt.event.*;

public class ko12_3 extends Applet implements ActionListener

{

int x,y;

double a;

Button bn1=new Button("Sin波形");

Button bn2=new Button("清除");

public void init()

{

add(bn1);

add(bn2);

bn1.addActionListener(this);

bn2.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

Graphics g=getGraphics();

if(e.getSource()==bn1)

{

for(x=0;x<=360;x+=9)

{

a=Math.sin(x*Math. PI/180);

y=(int)(80+40*a);

g.drawString("*",x,y);

}

}

if(e.getSource()==bn2)

repaint();

}

}

//ko12_3.Html

<APPLET CODE="ko12.3class"width=280 height=160>

</APPLET>