License text 

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER 
 * Copyright  2008, 2010 Oracle and/or its affiliates.  All rights reserved. 
 * Use is subject to license terms.
 * 
 * This file is available and licensed under the following license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met: 
 * 
 *   * Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer. 
 *
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *   * Neither the name of Oracle Corporation nor the names of its contributors 
 *     may be used to endorse or promote products derived from this software 
 *     without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

    

package pathanimation;

import javafx.animation.Interpolator;
import javafx.animation.transition.FadeTransition;
import javafx.scene.layout.Container;

    public abstract class Scenario extends Container {
    var fadein = FadeTransition {
        node: this
        fromValue: bind this.opacity
        toValue: 1
        duration: 2s
        interpolator: Interpolator.EASEOUT
    };

    var fadeout = FadeTransition {
        node: this
        fromValue: bind this.opacity
        toValue: 0
        duration: 2s
        interpolator: Interpolator.EASEOUT
    };

    public var running: Boolean on replace {
        if (running) then play() else pause();
    }

    protected abstract function play(): Void;
    protected abstract function pause(): Void;

    public function fadeIn() {
        if (running) then play();
        fadeout.stop();
        fadein.play();
    }

    public function fadeOut() {
        fadein.stop();
        fadeout.play();
        pause();
    }
}
JavaFX Sample
License text 

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER 
 * Copyright  2008, 2010 Oracle and/or its affiliates.  All rights reserved. 
 * Use is subject to license terms.
 * 
 * This file is available and licensed under the following license:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met: 
 * 
 *   * Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer. 
 *
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *   * Neither the name of Oracle Corporation nor the names of its contributors 
 *     may be used to endorse or promote products derived from this software 
 *     without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

    

package pathanimation;

import javafx.animation.Interpolator;
import javafx.animation.transition.FadeTransition;
import javafx.scene.layout.Container;

    public abstract class Scenario extends Container {
    var fadein = FadeTransition {
        node: this
        fromValue: bind this.opacity
        toValue: 1
        duration: 2s
        interpolator: Interpolator.EASEOUT
    };

    var fadeout = FadeTransition {
        node: this
        fromValue: bind this.opacity
        toValue: 0
        duration: 2s
        interpolator: Interpolator.EASEOUT
    };

    public var running: Boolean on replace {
        if (running) then play() else pause();
    }

    protected abstract function play(): Void;
    protected abstract function pause(): Void;

    public function fadeIn() {
        if (running) then play();
        fadeout.stop();
        fadein.play();
    }

    public function fadeOut() {
        fadein.stop();
        fadeout.play();
        pause();
    }
}