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

/* Moving Radar Beam without Double Buffering 

	(this will cause a flicker to appear)
*/


public class RadarBeam extends Applet implements Runnable
{
// notice the "implements runnable", this is needed for using threads



	Thread t;	
	// create a field that will be used for an instance of a thread

	private int startAngle;

	public void init()
	{
		setBackground(Color.black);

		t=new Thread(this);
		// instantiate a new thread object

		t.start();
		// start our thread running

		startAngle=90;
		// start at the top of the screen
	}

	public void run()
	{
		while(true)
		{
			repaint(); 

			try{
				t.sleep(5);
			}catch(InterruptedException e){ ; }		
			
			startAngle++;			
		}
	}

	public void paint(Graphics g)
	{
		g.setColor(Color.red);
		g.fillArc(0,0, size().width, size().height, startAngle, 30);
		// fillArc(int x, int y, int width, int height, int startAngle, int arcAngle)	

	}
}