将值添加到 DynamicTimeSeriesCollection 中的指定系列

该程序每秒都会接收数据并将它们绘制在时间序列图表上。然而，一旦我创建了两个系列，我就无法为其添加新的价值。它仅显示一条直线。

如何将数据附加到指定的系列？ IE。YYY。基于此example https://stackoverflow.com/a/5048863/230513，这就是我正在做的：

...
    // Data set.
    final DynamicTimeSeriesCollection dataset =
        new DynamicTimeSeriesCollection( 2, COUNT, new Second() );
    dataset.setTimeBase( new Second( 0, 0, 0, 1, 1, 2011 ) );

    dataset.addSeries( gaussianData(), 0, "XXX" );
    dataset.addSeries( gaussianData(), 1, "YYY" );

    // Chart.
    JFreeChart    chart = createChart( dataset );
    this.add( new ChartPanel( chart ), BorderLayout.CENTER );

    // Timer.
    timer = new Timer( 1000, new ActionListener() {
        @Override
        public void actionPerformed ( ActionEvent e ) {
            dataset.advanceTime();
            dataset.appendData( new float[] { randomValue() } );
        }
    } );
...

private JFreeChart createChart ( final XYDataset dataset ) {
    final JFreeChart result = ChartFactory.createTimeSeriesChart(
        TITLE, "", "", dataset, true, true, false );
    final XYPlot     plot   = result.getXYPlot();
    ValueAxis        domain = plot.getDomainAxis();
    domain.setAutoRange( true );

    ValueAxis range = plot.getRangeAxis();
    range.setRange( -MINMAX, MINMAX );
    return result;
}

假设你从here https://stackoverflow.com/a/5048863/230513，您指定了包含两个系列的数据集，但您只是附加one每个刻度的值Timer。每个刻度需要两个值。以下是我修改原图以获得下图的方法：

final DynamicTimeSeriesCollection dataset =
    new DynamicTimeSeriesCollection(2, COUNT, new Second());
...
dataset.addSeries(gaussianData(), 0, "Human");
dataset.addSeries(gaussianData(), 1, "Alien");
...
timer = new Timer(FAST, new ActionListener() {

    // two values appended with each tick
    float[] newData = new float[2];

    @Override
    public void actionPerformed(ActionEvent e) {
        newData[0] = randomValue();
        newData[1] = randomValue();
        dataset.advanceTime();
        dataset.appendData(newData);
    }
});