如何在JFreeChart TimeSeries图表上显示降雨指数和温度？
目前，我的TimeSeries图表每2秒显示一个位置的温度。
现在，如果我想每2秒显示降雨指数和温度，我该如何实现呢？
这是我的代码：
import testWeatherService.TestWeatherTimeLapseService; public class graph extends JFrame implements ActionListener { private static TimeSeries series; static final int COUNT = 200; /** The Constant WINDOW. */ public static final int WINDOW = 25; TestWeatherTimeLapseService getLocData = new TestWeatherTimeLapseService(); public graph(final String title) { super(title); this.series = new TimeSeries("Random Data", Millisecond.class); this.series2 = 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()); add(chartPanel, BorderLayout.SOUTH); content.add(chartPanel); chartPanel.setPreferredSize(new java.awt.Dimension(500, 600)); setContentPane(content); setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); } private JFreeChart createChart(final XYDataset dataset) { final JFreeChart result = ChartFactory.createTimeSeriesChart( "Graph", "Time", "Temperature", dataset, true, true, false ); final XYPlot plot = result.getXYPlot(); ValueAxis axis = plot.getDomainAxis(); axis.setAutoRange(true); axis.setFixedAutoRange(60000); // 60 seconds axis = plot.getRangeAxis(); axis.setRange(-10.0, 50.0); XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer( ); renderer.setSeriesPaint( 0 , Color.RED ); renderer.setSeriesStroke( 0 , new BasicStroke( 4.0f ) ); renderer.setSeriesPaint( 1 , Color.RED ); renderer.setSeriesStroke( 1 , new BasicStroke( 4.0f ) ); plot.setRenderer( renderer ); return result; } public void actionPerformed(final ActionEvent e) { // } public void update(){ String currTemperature=""; try { currTemperature=getLocData.getWeatherData("Laverton")[1]; //get temperature of laverton } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } float number = Float.parseFloat(currTemperature); number=(float) (number-273.15); final Millisecond now = new Millisecond(); System.out.println("Now = " + now.toString()); this.series.add(new Millisecond(), number); } public void doIt(){ final graph demo = new graph("Graph"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); EventQueue.invokeLater(new Runnable() { @Override public void run() { Timer timer; timer = new Timer(2000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { demo.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent ev) { //stop when user closes chart demo.dispose(); ((Timer)e.getSource()).stop(); } }); update(); } }); timer.start(); } }); }} 如此处所述， TimeSeriesCollection可以显示多个系列。 只需将两个系列添加到集合中，并更新计时器的ActionListener每个系列。 在下面的示例中，还会在每个TimeSeries上调用setMaximumItemAge() ，如此处所示，以丢弃旧数据。 为了适应不同的单位，您可以在同一个图上设置多个轴，如下所示。
import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.*; import java.util.Random; import javax.swing.JFrame; import javax.swing.Timer; import org.jfree.chart.*; import org.jfree.data.time.Second; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; /** @See https://stackoverflow.com/q/44037591/230513 */ public class ChartPanelTest { private static final Random R = new Random(); private static final int AGE = 60; public static void main(String[] args) { EventQueue.invokeLater(() -> { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); TimeSeriesCollection dataset = new TimeSeriesCollection(); TimeSeries series1 = new TimeSeries("T1"); series1.setMaximumItemAge(AGE); dataset.addSeries(series1); TimeSeries series2 = new TimeSeries("T2"); series2.setMaximumItemAge(AGE); dataset.addSeries(series2); JFreeChart chart = ChartFactory.createTimeSeriesChart( "Test", "Time", "Value", dataset, false, false, false); ChartPanel chartPanel = new ChartPanel(chart) { @Override public Dimension getPreferredSize() { return new Dimension(640, 480); } }; f.add(chartPanel); Timer timer = new Timer(2000, new ActionListener() { Second s = new Second(); { for (int i = 0; i < AGE; i++) actionPerformed(null); } @Override public void actionPerformed(ActionEvent e) { series1.add(s, R.nextGaussian()); series2.add(s, R.nextGaussian()); s = (Second) s.next().next(); } }); timer.start(); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); }); } }