使用 JFreeChart 显示时间序列中的最近变化

Question

如何使用 JFreeChart 连续显示最新数据更新时间序列？

附录：此处显示了包含已接受答案的完整、有效的示例。另请参阅具有两个系列的变体。另请参阅有关 setTimeBase() 的问答。

Answer 1

JFreeChart 类 JFreeChart 类jfree.org/jfreechart/api/javadoc/org/jfree/data/time/DynamicTimeSeriesCollection.html" rel="nofollow noreferrer">DynamicTimeSeriesCollection 是一个不错的选择。

附录：正如@Bahadır 所指出的，该系列的最后一点始终为零。 @Don 很有帮助地建议提前时间并然后附加数据。

dataset.advanceTime();
dataset.appendData(newData);

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JPanel;
import javax.swing.Timer;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.time.DynamicTimeSeriesCollection;
import org.jfree.data.time.Second;
import org.jfree.data.xy.XYDataset;
import org.jfree.chart.ui.ApplicationFrame;
import org.jfree.chart.ui.UIUtils;

/**
 * @see http://stackoverflow.com/a/15521956/230513
 * @see http://stackoverflow.com/questions/5048852
 */
public class DTSCTest extends ApplicationFrame {

    private static final String TITLE = "Dynamic Series";
    private static final String START = "Start";
    private static final String STOP = "Stop";
    private static final float MINMAX = 100;
    private static final int COUNT = 2 * 60;
    private static final int FAST = 100;
    private static final int SLOW = FAST * 5;
    private static final Random random = new Random();
    private Timer timer;

    public DTSCTest(final String title) {
        super(title);
        final DynamicTimeSeriesCollection dataset =
            new DynamicTimeSeriesCollection(1, COUNT, new Second());
        dataset.setTimeBase(new Second(0, 0, 0, 1, 1, 2011));
        dataset.addSeries(gaussianData(), 0, "Gaussian data");
        JFreeChart chart = createChart(dataset);

        final JButton run = new JButton(STOP);
        run.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String cmd = e.getActionCommand();
                if (STOP.equals(cmd)) {
                    timer.stop();
                    run.setText(START);
                } else {
                    timer.start();
                    run.setText(STOP);
                }
            }
        });

        final JComboBox combo = new JComboBox();
        combo.addItem("Fast");
        combo.addItem("Slow");
        combo.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if ("Fast".equals(combo.getSelectedItem())) {
                    timer.setDelay(FAST);
                } else {
                    timer.setDelay(SLOW);
                }
            }
        });

        this.add(new ChartPanel(chart) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(640, 480);
            }
        }, BorderLayout.CENTER);
        JPanel btnPanel = new JPanel(new FlowLayout());
        btnPanel.add(run);
        btnPanel.add(combo);
        this.add(btnPanel, BorderLayout.SOUTH);

        timer = new Timer(FAST, new ActionListener() {
            float[] newData = new float[1];

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

    private float randomValue() {
        return (float) (random.nextGaussian() * MINMAX / 3);
    }

    private float[] gaussianData() {
        float[] a = new float[COUNT];
        for (int i = 0; i < a.length; i++) {
            a[i] = randomValue();
        }
        return a;
    }

    private JFreeChart createChart(final XYDataset dataset) {
        final JFreeChart result = ChartFactory.createTimeSeriesChart(
            TITLE, "hh:mm:ss", "milliVolts", 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;
    }

    public void start() {
        timer.start();
    }

    public static void main(final String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                DTSCTest demo = new DTSCTest(TITLE);
                demo.pack();
                UIUtils.centerFrameOnScreen(demo);
                demo.setVisible(true);
                demo.start();
            }
        });
    }
}

Answer 2

您还可以先通过 advanceTime() 消除零，然后通过 appendData 消除零。 （交换他们在示例中的操作方式）。

Answer 3

@thrashgod 答案的另一种方法是使用 TimeSeriesCollection 并在 TimeSeries 上设置项目年龄。下面的代码可以设置一个图表，以 1 分钟的间隔显示最近 1 小时的数据。

private TimeSeriesCollection dataset;
private TimeSeries sensorSeries;
sensorSeries = new TimeSeries("name", Minute.class);
sensorSeries.setMaximumItemAge(60);
dataset = new TimeSeriesCollection();
dataset.addSeries(sensorSeries);

..您将添加附带的数据：

sensorSeries.add(new Minute(new Date()), newData);