001 /*
002 * PlayerThread.java
003 *
004 *
005 * The Salamander Project - 2D and 3D graphics libraries in Java
006 * Copyright (C) 2004 Mark McKay
007 *
008 * This library is free software; you can redistribute it and/or
009 * modify it under the terms of the GNU Lesser General Public
010 * License as published by the Free Software Foundation; either
011 * version 2.1 of the License, or (at your option) any later version.
012 *
013 * This library is distributed in the hope that it will be useful,
014 * but WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
016 * Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public
019 * License along with this library; if not, write to the Free Software
020 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
021 *
022 * Mark McKay can be contacted at mark@kitfox.com. Salamander and other
023 * projects can be found at http://www.kitfox.com
024 *
025 * Created on September 28, 2004, 10:07 PM
026 */
027
028
029 package com.kitfox.svg.app;
030
031 import java.util.*;
032
033 /**
034 *
035 * @author kitfox
036 */
037 public class PlayerThread implements Runnable
038 {
039 HashSet listeners = new HashSet();
040
041 double curTime = 0;
042 double timeStep = .2;
043
044 public static final int PS_STOP = 0;
045 public static final int PS_PLAY_FWD = 1;
046 public static final int PS_PLAY_BACK = 2;
047
048 int playState = PS_STOP;
049
050 Thread thread;
051
052 /** Creates a new instance of PlayerThread */
053 public PlayerThread()
054 {
055 thread = new Thread(this);
056 thread.start();
057 }
058
059 public void run()
060 {
061 while (thread != null)
062 {
063 synchronized (this)
064 {
065 switch (playState)
066 {
067 case PS_PLAY_FWD:
068 curTime += timeStep;
069 break;
070 case PS_PLAY_BACK:
071 curTime -= timeStep;
072 if (curTime < 0) curTime = 0;
073 break;
074 default:
075 case PS_STOP:
076 break;
077 }
078
079 fireTimeUpdateEvent();
080 }
081
082 try
083 {
084 Thread.sleep((long)(timeStep * 1000));
085 }
086 catch (Exception e)
087 {
088 throw new RuntimeException(e);
089 }
090 }
091 }
092
093 public void exit() { thread = null; }
094 public synchronized void addListener(PlayerThreadListener listener)
095 {
096 listeners.add(listener);
097 }
098
099 public synchronized double getCurTime() { return curTime; }
100
101 public synchronized void setCurTime(double time)
102 {
103 curTime = time;
104 }
105
106 public synchronized double getTimeStep() { return timeStep; }
107
108 public synchronized void setTimeStep(double time)
109 {
110 timeStep = time;
111 if (timeStep < .01) timeStep = .01;
112 }
113
114 public synchronized int getPlayState() { return playState; }
115
116 public synchronized void setPlayState(int playState)
117 {
118 this.playState = playState;
119 }
120
121 private void fireTimeUpdateEvent()
122 {
123 for (Iterator it = listeners.iterator(); it.hasNext();)
124 {
125 PlayerThreadListener listener = (PlayerThreadListener)it.next();
126 listener.updateTime(curTime, timeStep, playState);
127 }
128 }
129 }