import java.applet.Applet;
import java.awt.*;

public class Sine extends Applet
{
int width, height;
public void init ()
{
	Dimension d = size ();
	width = d.width;
	height = d.height;
}

public void paint ( Graphics g )
{
	int x, x0;
	double y0, y, A, f, t, offset;

	A = (double) height / 4;
	f = 2;
	offset = (double) height / 2;
	x0 = 0;
	y0 = offset;

	g.drawLine ( x0, (int) y0, width, (int) y0 );
	g.drawLine ( width/2, 0, width/2, height );
	for ( x=0; x<width; x+=1)
	{
		t = (double) x / ( (double) width );
		y = offset - A * Math.sin ( 2 * Math.PI * f * t );
		g.drawLine ( x0, (int) y0, x, (int) y );
		x0 = x;
		y0 = y;
	}
}

public static void main ( String args[] )
{
	Frame f = new Frame ("Sine curve");
	Sine sine = new Sine ();
	f.show ();
	sine.init ();
}
}