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//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
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