/* 
 * XAnim.java --
 *
 *      animation stuff.
 *
 * Copyright 1995 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/XAnim.java,v 1.1 1995/10/07 14:15:40 rywang Exp $ xFS (Berkeley)"
 */

package ryw;

import java.awt.*;
import java.awt.image.*;
import java.util.Vector;
import java.util.Enumeration;


/**
 * A runnable object that performs animations.
 * It has a queue of actions to be performed.
 * the thread repeadely dequeues this queue and performs the action.
 * @see ryw.XMover
 */
public abstract class XAnim extends Vector implements Runnable {
    Thread animator;

    public void start () {
	if (animator == null) {
	    animator = new Thread (this);
	}
	animator.start ();
    }


    public void stop () {
	animator.stop ();
    }

    
    public void waitTilDone () {

	if (animator == null)
	    return;
	
	try {
	    animator.join ();
	} catch (InterruptedException e) {
	    return;
	}
    }
}