Question

我有一个动态区域图表，用w鼠标滚轮监听器将数据放在我的图表上的时间，我想设置我的域轴10秒只因为我的图表从头开始显示所有数据但我想要只显示最后10秒。怎么做？这是我的代码：

 final XYSeries series = new XYSeries("Data");

    XYSeriesCollection dataset = new XYSeriesCollection(series);

    // Creation du area chart
    JFreeChart chart = ChartFactory.createXYAreaChart("Fun Meter", "", "",
            dataset, PlotOrientation.VERTICAL, false, false, false);


    final JLabel a = new JLabel();
    // Un chartpanel pour contenir le area chart
    ChartPanel CP = new ChartPanel(chart);

    // creation d'objet plot pour ajustement de tout ce qui est graphique
    XYPlot xyPlot = (XYPlot) chart.getPlot();

    // la couleur degradée pour le remplissage du area chart
    GradientPaint gp0 = new GradientPaint(0.0f, 100.0f, new Color(50, 205,
            50), 0.0f, 100.0f, Color.red);

    xyPlot.getRenderer().setSeriesPaint(0, gp0);
    xyPlot.setBackgroundPaint(Color.black);
    xyPlot.setForegroundAlpha(0.75f);

    GradientPaint gp1 = new GradientPaint(0.0f, 100.0f, Color.black, 0.0f,
            1000.0f, new Color(153, 153, 153));

    chart.setBackgroundPaint(gp1);

    CP.addMouseWheelListener(new MouseWheelListener() {
        public void mouseWheelMoved(MouseWheelEvent e) {

            Integer rx = e.getWheelRotation();
            Wheel = Wheel - rx;
                    }
    });

    new Timer(100, new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            series.add(series.getItemCount(), Wheel);
        }
    }).start();

Answer 1

一种方法是使用显示DynamicTimeSeriesCollection的here。 nMoments构造函数参数指定要保留的TimePeriod单位数。

JFreeChart XYAreaChart设置域轴

1 个答案: