blocks|key|579054|text|JFreeChart类DynamicTimeSeriesCollection是一个不错的选择。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|579055|增编:正如@Bahadır所指出的，该系列的最后一点始终为零。@Don建议提前时间，然后追加数据。|579056|dataset.advanceTime();
dataset.appendData(newData);|code-block|syntax|javascript|579057|​|579058|📷|atomic|579059|579060|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%2B%2B)+{
++++++++++++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();
++++++++++++}
++++++++});
++++}
}|579061|entityMap|0|LINK|mutability|MUTABLE|url|http://www.jfree.org/jfreechart/|1|http://www.jfree.org/jfreechart/api/javadoc/org/jfree/data/time/DynamicTimeSeriesCollection.html|2|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/eb8b5ac482eba9765497288a2474011b.png|imageAlt^0|0|A|B|R|0|A|0|B|R|1|0|0|0|0|0|1|2|0|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@$9|1F|A|1G|1|1H]|$9|1I|A|1J|1|1K]]|E|$]]|$1|F|3|G|5|6|7|1L|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1M|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1N|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1O|8|@]|D|@$9|1P|A|1Q|1|1R]]|E|$]]|$1|R|3|N|5|6|7|1S|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1T|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|1U|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]|14|$5|15|Y|16|E|$17|18|19|-4]]]]

The <a href="http://www.jfree.org/jfreechart/" rel="nofollow noreferrer"><code>JFreeChart</code></a> class <a href="http://www.jfree.org/jfreechart/api/javadoc/org/jfree/data/time/DynamicTimeSeriesCollection.html" rel="nofollow noreferrer"><code>DynamicTimeSeriesCollection</code></a> is a good choice.
Addendum: As noted by @Bahadır, the last point of the series was persistently zero. @Don helpfully suggests advancing the time and then appending the data.
<pre><code>dataset.advanceTime();
dataset.appendData(newData);
</code></pre>
<img src="https://i.stack.imgur.com/dKHVg.png" alt="enter image description here" />
<pre><code>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 = &quot;Dynamic Series&quot;;
 private static final String START = &quot;Start&quot;;
 private static final String STOP = &quot;Stop&quot;;
 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, &quot;Gaussian data&quot;);
 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(&quot;Fast&quot;);
 combo.addItem(&quot;Slow&quot;);
 combo.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 if (&quot;Fast&quot;.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 &lt; a.length; i++) {
 a[i] = randomValue();
 }
 return a;
 }

 private JFreeChart createChart(final XYDataset dataset) {
 final JFreeChart result = ChartFactory.createTimeSeriesChart(
 TITLE, &quot;hh:mm:ss&quot;, &quot;milliVolts&quot;, 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();
 }
 });
 }
}
</code></pre>

blocks|key|579095|text|您还可以先消除零，然后是advanceTime()，然后是appendData。(在示例中交换他们所做的方式)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|579096|entityMap^0|C|D|T|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

You can also eliminate the zero by first <code>advanceTime()</code>, then <code>appendData</code>. (swap the way they are doing it in the example).

blocks|key|2698432|text|使用TimeSeriesCollection并在TimeSeries上设置项的年龄是@thrashgod的另一种解决方法。下面的代码可以设置一个图表，以显示持续1小时的数据，间隔1分钟。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2698433|private+TimeSeriesCollection+dataset;
private+TimeSeries+sensorSeries;
sensorSeries+=+new+TimeSeries("name",+Minute.class);
sensorSeries.setMaximumItemAge(60);
dataset+=+new+TimeSeriesCollection();
dataset.addSeries(sensorSeries);|code-block|syntax|javascript|2698434|..and，您将添加随附的数据：|2698435|sensorSeries.add(new+Minute(new+Date()),+newData);|2698436|entityMap^0|2|K|O|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

One alternative approach to @thrashgod's answer would be to use <code>TimeSeriesCollection</code> and setting item age on the <code>TimeSeries</code>. Below code can setup a graph to show last 1 hour of data with 1 minute intervals.

<pre><code>private TimeSeriesCollection dataset;
private TimeSeries sensorSeries;
sensorSeries = new TimeSeries("name", Minute.class);
sensorSeries.setMaximumItemAge(60);
dataset = new TimeSeriesCollection();
dataset.addSeries(sensorSeries);
</code></pre>

..and you will add the data as it comes with:

<pre><code>sensorSeries.add(new Minute(new Date()), newData);
</code></pre>

How can I use <a href="http://www.jfree.org/jfreechart/" rel="noreferrer"><code>JFreeChart</code></a> to display just the most recent data in a continually updated time series?

Addenda: A complete, working example that incorporates the accepted answer is shown <a href="https://stackoverflow.com/a/5048863/230513">here</a>. See also this <a href="https://stackoverflow.com/a/15521956/230513">variation</a> having two series. See also this <a href="https://stackoverflow.com/q/31902373/230513">Q&amp;A</a> regarding <code>setTimeBase()</code>.

Using JFreeChart to display recent changes in a time series

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何使用在不断更新的时间序列中仅显示最新的数据？增编:一个完整的，工作的例子，结合接受的答案，显示。也请参阅这个有两个系列的。还请参阅有关的setTimeBase()。

问使用JFreeChart显示时间序列中的最近变化
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