javafx/javafx2.samples/ChartAudioArea/src/chartaudioarea/ChartAudioArea.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package chartaudioarea;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.stage.Stage;

/** 
 * An advanced area chart with sound and animation. The sound is in AAC audio format.
 *
 * @see javafx.scene.chart.AreaChart
 * @see javafx.scene.chart.Chart
 * @see javafx.scene.chart.NumberAxis
 * @see javafx.scene.chart.XYChart
 * @see javafx.scene.media.AudioSpectrumListener
 * @see javafx.scene.media.Media
 * @see javafx.scene.media.MediaPlayer
 */
public class ChartAudioArea extends Application {
    private XYChart.Data<Number,Number>[] series1Data;
    private AudioSpectrumListener audioSpectrumListener;

    private static final String AUDIO_URI = System.getProperty("demo.audio.url","http://download.oracle.com/otndocs/javafx/JavaRap_Audio.mp4");
    private static MediaPlayer audioMediaPlayer;
    private static final boolean PLAY_AUDIO = Boolean.parseBoolean(System.getProperty("demo.play.audio","true"));

    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setScene(new Scene(root));
        root.getChildren().add(createChart());
        audioSpectrumListener = new AudioSpectrumListener() {
            @Override public void spectrumDataUpdate(double timestamp, double duration,
                    float[] magnitudes, float[] phases) {
                for (int i = 0; i < series1Data.length; i++) {
                    series1Data[i].setYValue(magnitudes[i] + 60);
                }
            }
        };
    }

    public void play() {
        this.startAudio();
    }

    @Override public void stop() {
        this.stopAudio();
    }

    protected AreaChart<Number,Number> createChart() {
        final NumberAxis xAxis = new NumberAxis(0,128,8);
        final NumberAxis yAxis = new NumberAxis(0,50,10);
        final AreaChart<Number,Number> ac = new AreaChart<Number,Number>(xAxis,yAxis);
        // setup chart
        ac.setId("audioAreaDemo");
        ac.setLegendVisible(false);
        ac.setTitle("Live Audio Spectrum Data");
        ac.setAnimated(false);
        xAxis.setLabel("Frequency Bands");
        yAxis.setLabel("Magnitudes");
        yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis,null,"dB"));
        // add starting data
        XYChart.Series<Number,Number> series = new XYChart.Series<Number,Number>();
        series.setName("Audio Spectrum");
        //noinspection unchecked
        series1Data = new XYChart.Data[(int)xAxis.getUpperBound()];
        for (int i=0; i<series1Data.length; i++) {
            series1Data[i] = new XYChart.Data<Number,Number>(i,50);
            series.getData().add(series1Data[i]);
        }
        ac.getData().add(series);
        return ac;
    }

    private void startAudio() {
        if (PLAY_AUDIO) {
            getAudioMediaPlayer().setAudioSpectrumListener(audioSpectrumListener);
            getAudioMediaPlayer().play();
        }
    }

    private void stopAudio() {
        if (getAudioMediaPlayer().getAudioSpectrumListener() == audioSpectrumListener) {
            getAudioMediaPlayer().pause();
        }
    }

   private static MediaPlayer getAudioMediaPlayer() {
        if (audioMediaPlayer == null) {
            Media audioMedia = new Media(AUDIO_URI);
            audioMediaPlayer = new MediaPlayer(audioMedia);
        }
        return audioMediaPlayer;
    }

    @Override public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
        play();
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX 
     * application. main() serves only as fallback in case the 
     * application can not be launched through deployment artifacts,
     * e.g., in IDEs with limited FX support. NetBeans ignores main().
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}