SimpleFPSAnimator.java

/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org

This file is part of Gephi.

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

Copyright 2011 Gephi Consortium. All rights reserved.

The contents of this file are subject to the terms of either the GNU
General Public License Version 3 only ("GPL") or the Common
Development and Distribution License("CDDL") (collectively, the
"License"). You may not use this file except in compliance with the
License. You can obtain a copy of the License at
http://gephi.org/about/legal/license-notice/
or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the
specific language governing permissions and limitations under the
License.  When distributing the software, include this License Header
Notice in each file and include the License files at
/cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the
License Header, with the fields enclosed by brackets [] replaced by
your own identifying information:
"Portions Copyrighted [year] [name of copyright owner]"

If you wish your version of this file to be governed by only the CDDL
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"[Contributor] elects to include this software in this distribution
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However, if you add GPL Version 3 code and therefore, elected the GPL
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Contributor(s):

Portions Copyrighted 2011 Gephi Consortium.
*/
package org.gephi.visualization.scheduler;

import org.gephi.visualization.apiimpl.Scheduler;
import java.util.concurrent.atomic.AtomicBoolean;
import org.gephi.visualization.swing.GraphDrawableImpl;

/**
 *
 * @author Mathieu Bastian
 */
public class SimpleFPSAnimator extends Thread {

    private Scheduler scheduler;
    private GraphDrawableImpl drawable;
    private long delay;
    private AtomicBoolean animating;
    private final Object lock = new Object();
    private boolean displayCall = false;
    private long startTime;

    public SimpleFPSAnimator(Scheduler scheduler, GraphDrawableImpl drawble, float fps) {
        super("SimpleFPSAnimator");
        setDaemon(true);
        this.drawable = drawble;
        this.scheduler = scheduler;
        this.animating = new AtomicBoolean();

        setFps(fps);
        animating.set(true);
    }

    @Override
    public void run() {

        try {
            while (animating.get()) {
                startTime = System.currentTimeMillis();
                scheduler.updateWorld();
                scheduler.updatePosition();
                displayCall = true;
                drawable.display();
                displayCall = false;
                long timeout;
                while ((timeout = delay - System.currentTimeMillis() + startTime) > 0) {
                    //Wait only if the time spent in display is inferior than delay
                    //Otherwise the render loop acts as a 'as fast as you can' loop
                    synchronized (this.lock) {
                        this.lock.wait(timeout);
                    }
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public void shutdown() {
        animating.set(false);
    }

    public boolean isAnimating() {
        return animating.get();
    }

    public void setFps(float fps) {
        delay = (long) (1000.0f / fps);
        synchronized (this.lock) {
            startTime = 0;
            this.lock.notify();
        }
    }

    public boolean isDisplayCall() {
        return displayCall;
    }
}