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java - 图表面板中间的 JFreeChart AreaChart

转载 作者:行者123 更新时间:2023-12-02 06:25:59 26 4
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我有一个动态面积图,我希望它从面板中间显示,这意味着我希望从 X 轴中间添加数据,而不是从图表右侧添加数据。我正在使用显示的示例 here 。这个怎么做?这是我的代码:

public class essaijfree2 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 essaijfree2(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);
XYPlot xyPlot = (XYPlot) chart.getPlot();
XYDifferenceRenderer r = new XYDifferenceRenderer(Color.green,Color.red, true);
xyPlot.setRenderer(r);



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), BorderLayout.CENTER);
JPanel btnPanel = new JPanel(new FlowLayout());

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.createXYAreaChart(
TITLE, "hh:mm:ss", "milliVolts", dataset,PlotOrientation.VERTICAL, 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() {
essaijfree2 demo = new essaijfree2(TITLE);
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
demo.start();
}
});
}

最佳答案

设置域轴上边距:

domain.setUpperMargin(0.5);

关于java - 图表面板中间的 JFreeChart AreaChart,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20524198/

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