/* 
 * XRunCanvas.java --
 *
 *      canvas that has some action going on.
 *
 * Copyright 1996 Regents of the University of California
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that this copyright
 * notice appears in all copies.  The University of California
 * makes no representations about the suitability of this
 * software for any purpose.  It is provided "as is" without
 * express or implied warranty.
 *
 * rcsid = "$Header: /disks/barad-dur/now/rywang/src/java/classes/ryw/XPict.java,v 1.1 1995/09/27 07:33:22 rywang Exp $ xFS (Berkeley)"
 */

package ryw;

import java.awt.*;
import java.awt.image.*;


/**
 * A Canvas that repaints itself once in a while.
 */
public abstract class XRunCanvas extends Canvas implements Runnable {
    Thread kicker = null;
    boolean die = false;
    int sleep = 3;

    public void initialize (int sleepSecs) {
	die = false;
	sleep = sleepSecs;
    }

    public void start () {
	die = false;
	if (kicker != null)
	    return;
	kicker = new Thread (this);
	kicker.start ();
    }

    public void run () {
	while (!die) {
	    repaint ();
	    try {
		Thread.sleep (sleep*1000);
	    } catch (InterruptedException e) {
		break;
	    }
	}
    }

    public void stop () {
	die = true;
	if (kicker != null) {
	    kicker.stop ();
	    kicker = null;
	}
    }
}