我正在使用这个示例，它将rondom动态数据放入 TimeSeriesCollection 图表中。
我的问题是我找不到如何：
1-仅通过实现水平滚动条，在它们通过视图区域的左边界（因为数据点从右到左移动）时跟踪旧数据（最后一小时）。
2-当我想拥有所有数据历史记录时，XML 是保存数据的好选择吗？
public class DynamicDataDemo extends ApplicationFrame {
/** The time series data. */
private TimeSeries series;
/** The most recent value added. */
private double lastValue = 100.0;
public DynamicDataDemo(final String title) {
super(title);
this.series = new TimeSeries("Random Data", Millisecond.class);
final TimeSeriesCollection dataset = new TimeSeriesCollection(this.series);
final JFreeChart chart = createChart(dataset);
final ChartPanel chartPanel = new ChartPanel(chart);
final JPanel content = new JPanel(new BorderLayout());
content.add(chartPanel);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(content);
}
private JFreeChart createChart(final XYDataset dataset) {
final JFreeChart result = ChartFactory.createTimeSeriesChart(
"Dynamic Data Demo",
"Time",
"Value",
dataset,
true,
true,
false
);
final XYPlot plot = result.getXYPlot();
ValueAxis axis = plot.getDomainAxis();
axis.setAutoRange(true);
axis.setFixedAutoRange(60000.0); // 60 seconds
axis = plot.getRangeAxis();
axis.setRange(0.0, 200.0);
return result;
}
public void go() {
final double factor = 0.90 + 0.2 * Math.random();
this.lastValue = this.lastValue * factor;
final Millisecond now = new Millisecond();
System.out.println("Now = " + now.toString());
this.series.add(new Millisecond(), this.lastValue);
}
public static void main(final String[] args) throws InterruptedException {
final DynamicDataDemo demo = new DynamicDataDemo("Dynamic Data Demo");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
while(true){
demo.go();
Thread.currentThread().sleep(1000);
}
}
}