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

/*
By Futrelle for COM1370 7/6/01

All that's required for timing is to implement the Runnable interface
with the methods start() and run() and an instance variable
of type Thread.    It's that simple!

In this example, a pair of lines is moved in mirror image  fashion,
20 times per second for 5 seconds (100 steps).

*/

public class MoveLine extends Applet implements Runnable {
	
    Thread runner;
    int step;

	public void init() {
		setBackground(Color.white);
	}

    // The following is queued by repaint() to be called.

    public void paint(Graphics g) {

	g.setColor(Color.magenta); // color  for line
	g.drawLine(100 + 2*step, 200 + 3*step, 200 - step, 50 + 2*step);
	// interchange x and y to give  mirror  image line
	g.drawLine( 200 + 3*step, 100 + 2*step, 50 + 2*step,  200 - step);
	g.setColor(Color.black); // color  for text
	g.drawString("R. Futrelle COM1370 Sm2001 Timed Lines Demo, 7/6/01", 
		     10, 490);
	g.drawLine(0,0,500,500);
    } // paint()
    
    public void start() {
	runner = new Thread(this);
	runner.start();
    } // start()

    public void run() {
	for (step = 0; step < 100 ;step++) {
	    try {
		Thread.sleep(50);
	    }
	    catch (InterruptedException e) {
	    }
	    repaint();
	}
    }

}