java JFreeChart X轴标签已超出图表区域
我有一个JFreeChart图表，其中DateAxis作为域。它看起来非常漂亮，但是最后一个轴标签有时会超出图表区域。下面是要复制的示例代码：
public class LineChart_AWT extends ApplicationFrame {
public LineChart_AWT( String applicationTitle , String chartTitle ) {
super(applicationTitle);
ValueAxis timeAxis = new DateAxis("");
NumberAxis valueAxis = new NumberAxis("Number");
((DateAxis)timeAxis).setDateFormatOverride(new SimpleDateFormat("YYYY-MM-dd HH:mm"));
XYPlot plot = new XYPlot(createDataset(), timeAxis, valueAxis, null);
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true, false);
plot.setRenderer(renderer);
plot.getRangeAxis().setAutoRange(true);
((NumberAxis)plot.getRangeAxis()).setAutoRangeIncludesZero(false);
JFreeChart lineChart = new JFreeChart(chartTitle, plot);
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinesVisible(true);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
lineChart.setBackgroundPaint(Color.white);
ChartPanel chartPanel = new ChartPanel( lineChart );
chartPanel.setPreferredSize( new java.awt.Dimension( 560 , 367 ) );
setContentPane( chartPanel );
}
private TimeSeriesCollection createDataset( ) {
TimeSeries typeA = new TimeSeries("TypeA");
TimeSeries typeB = new TimeSeries("TypeB");
TimeSeriesCollection collection = new TimeSeriesCollection();
collection.addSeries(typeA);
collection.addSeries(typeB);
typeA = collection.getSeries("TypeA");
typeA.add(new Hour(8, new Day()), 1.0);
typeA.add(new Hour(10, new Day()), 1.0);
typeA.add(new Hour(11, new Day()), 1.0);
typeA.add(new Hour(13, new Day()), 1.0);
typeA.add(new Hour(16, new Day()), 2.0);
typeA.add(new Hour(18, new Day()), 2.0);
typeB.add(new Hour(8, new Day()), 1.0);
typeB.add(new Hour(19, new Day()), 2.0);
typeB.add(new Hour(20, new Day()), 5.0);
return collection;
}
public static void main( String[ ] args ) {
LineChart_AWT chart = new LineChart_AWT(
"X-axis demo" ,
"X-axis labels are truncated");
chart.pack( );
RefineryUtilities.centerFrameOnScreen( chart );
chart.setVisible( true );
}
}
以下是当前的屏幕截图；问题可以在最后一个标签上看到：
是什么导致最后一个标签在当前图表区域之外呈现？还有，我该如何预防呢
更新
下面是一个更全面的例子，包括截图和所有细节
根据@trashgood的评论，我已经更新到了最新的JFreeChart引擎
（jfreechart-1.0.19.jar和jcommon-1.0.23.jar）
（jfreechart-1.6.0-snapshot.jar）
考虑这个例子（这深深地依赖于@ TrasHood的建议-非常感谢）：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.text.SimpleDateFormat;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.chart.ui.ApplicationFrame;
import org.jfree.data.time.Minute;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
/**
* @see https://stackoverflow.com/a/57637615/230513
* @see https://stackoverflow.com/a/57544811/230513
*/
public class TimeChart extends ApplicationFrame {
private static boolean lot_of_values = false;
public TimeChart(String applicationTitle, String chartTitle) {
super(applicationTitle);
DateAxis timeAxis = new DateAxis("Timestamp");
timeAxis.setUpperMargin(DateAxis.DEFAULT_UPPER_MARGIN /* * 2*/); // UPDATED
timeAxis.setLowerMargin(DateAxis.DEFAULT_LOWER_MARGIN /* * 2*/); // UPDATED
timeAxis.setDateFormatOverride(new SimpleDateFormat("YYYY-MM-dd HH:mm"));
NumberAxis numberAxis = new NumberAxis("Number");
numberAxis.setAutoRangeIncludesZero(false);
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(true, false);
XYPlot plot = new XYPlot(createDataset(), timeAxis, numberAxis, renderer);
plot.setBackgroundPaint(Color.lightGray);
plot.setDomainGridlinePaint(Color.white);
plot.setRangeGridlinePaint(Color.white);
JFreeChart lineChart = new JFreeChart(chartTitle, plot);
lineChart.setBackgroundPaint(Color.white);
ChartPanel chartPanel = new ChartPanel(lineChart) {
@Override
public Dimension getPreferredSize() {
return new Dimension(1529 , 538);
}
};
add(chartPanel);
}
private TimeSeriesCollection createDataset() {
TimeSeries typeA = new TimeSeries("Temperatures");
TimeSeriesCollection collection = new TimeSeriesCollection();
collection.addSeries(typeA);
if (lot_of_values) {
typeA.add(Minute.parseMinute("2019-08-25 00:00"), 26.68);
typeA.add(Minute.parseMinute("2019-08-25 01:00"), 26.75);
typeA.add(Minute.parseMinute("2019-08-25 02:00"), 25.95);
typeA.add(Minute.parseMinute("2019-08-25 03:00"), 25.47);
typeA.add(Minute.parseMinute("2019-08-25 04:00"), 25.19);
typeA.add(Minute.parseMinute("2019-08-25 05:00"), 24.65);
typeA.add(Minute.parseMinute("2019-08-25 06:00"), 24.61);
typeA.add(Minute.parseMinute("2019-08-25 07:00"), 25.58);
typeA.add(Minute.parseMinute("2019-08-25 08:00"), 26.43);
typeA.add(Minute.parseMinute("2019-08-25 09:00"), 26.96);
typeA.add(Minute.parseMinute("2019-08-25 10:00"), 27.81);
typeA.add(Minute.parseMinute("2019-08-25 11:00"), 28.69);
typeA.add(Minute.parseMinute("2019-08-25 12:00"), 29.39);
typeA.add(Minute.parseMinute("2019-08-25 13:00"), 29.89);
typeA.add(Minute.parseMinute("2019-08-25 14:00"), 30.32);
typeA.add(Minute.parseMinute("2019-08-25 15:00"), 30.69);
typeA.add(Minute.parseMinute("2019-08-25 16:00"), 30.83);
typeA.add(Minute.parseMinute("2019-08-25 17:00"), 30.85);
typeA.add(Minute.parseMinute("2019-08-25 18:00"), 30.64);
typeA.add(Minute.parseMinute("2019-08-25 19:00"), 30.04);
typeA.add(Minute.parseMinute("2019-08-25 20:00"), 29.51);
typeA.add(Minute.parseMinute("2019-08-25 21:00"), 28.63);
typeA.add(Minute.parseMinute("2019-08-25 22:00"), 28.48);
typeA.add(Minute.parseMinute("2019-08-25 23:00"), 27.15);
typeA.add(Minute.parseMinute("2019-08-26 00:00"), 27.3);
typeA.add(Minute.parseMinute("2019-08-26 01:00"), 27.05);
typeA.add(Minute.parseMinute("2019-08-26 02:00"), 26.84);
typeA.add(Minute.parseMinute("2019-08-26 03:00"), 26.47);
typeA.add(Minute.parseMinute("2019-08-26 04:00"), 26.34);
typeA.add(Minute.parseMinute("2019-08-26 05:00"), 25.95);
typeA.add(Minute.parseMinute("2019-08-26 06:00"), 26.46);
typeA.add(Minute.parseMinute("2019-08-26 07:00"), 26.75);
typeA.add(Minute.parseMinute("2019-08-26 08:00"), 26.94);
typeA.add(Minute.parseMinute("2019-08-26 09:00"), 27.05);
typeA.add(Minute.parseMinute("2019-08-26 10:00"), 27.35);
typeA.add(Minute.parseMinute("2019-08-26 11:00"), 27.67);
typeA.add(Minute.parseMinute("2019-08-26 12:00"), 28.12);
typeA.add(Minute.parseMinute("2019-08-26 13:00"), 28.41);
typeA.add(Minute.parseMinute("2019-08-26 14:00"), 28.67);
typeA.add(Minute.parseMinute("2019-08-26 15:00"), 28.99);
typeA.add(Minute.parseMinute("2019-08-26 16:00"), 28.99);
typeA.add(Minute.parseMinute("2019-08-26 17:00"), 29.02);
typeA.add(Minute.parseMinute("2019-08-26 18:00"), 29.02);
typeA.add(Minute.parseMinute("2019-08-26 19:00"), 28.43);
typeA.add(Minute.parseMinute("2019-08-26 20:00"), 27.87);
typeA.add(Minute.parseMinute("2019-08-26 21:00"), 27.2);
typeA.add(Minute.parseMinute("2019-08-26 22:00"), 26.88);
typeA.add(Minute.parseMinute("2019-08-26 23:00"), 26.31);
typeA.add(Minute.parseMinute("2019-08-27 00:00"), 26.02);
typeA.add(Minute.parseMinute("2019-08-27 01:00"), 25.51);
typeA.add(Minute.parseMinute("2019-08-27 02:00"), 25.12);
typeA.add(Minute.parseMinute("2019-08-27 03:00"), 25.11);
typeA.add(Minute.parseMinute("2019-08-27 04:00"), 24.97);
typeA.add(Minute.parseMinute("2019-08-27 05:00"), 24.85);
typeA.add(Minute.parseMinute("2019-08-27 06:00"), 24.73);
typeA.add(Minute.parseMinute("2019-08-27 07:00"), 25.04);
typeA.add(Minute.parseMinute("2019-08-27 08:00"), 25.68);
typeA.add(Minute.parseMinute("2019-08-27 09:00"), 26.22);
typeA.add(Minute.parseMinute("2019-08-27 10:00"), 26.69);
typeA.add(Minute.parseMinute("2019-08-27 11:00"), 27.3);
typeA.add(Minute.parseMinute("2019-08-27 12:00"), 27.84);
typeA.add(Minute.parseMinute("2019-08-27 13:00"), 28.26);
typeA.add(Minute.parseMinute("2019-08-27 14:00"), 28.6);
typeA.add(Minute.parseMinute("2019-08-27 15:00"), 29.03);
typeA.add(Minute.parseMinute("2019-08-27 16:00"), 29.38);
typeA.add(Minute.parseMinute("2019-08-27 17:00"), 29.62);
typeA.add(Minute.parseMinute("2019-08-27 18:00"), 29.47);
typeA.add(Minute.parseMinute("2019-08-27 19:00"), 29.01);
typeA.add(Minute.parseMinute("2019-08-27 20:00"), 28.31);
typeA.add(Minute.parseMinute("2019-08-27 21:00"), 27.69);
typeA.add(Minute.parseMinute("2019-08-27 22:00"), 26.93);
typeA.add(Minute.parseMinute("2019-08-27 23:00"), 26.37);
}
typeA.add(Minute.parseMinute("2019-08-28 00:00"), 26.12);
typeA.add(Minute.parseMinute("2019-08-28 01:00"), 25.77);
typeA.add(Minute.parseMinute("2019-08-28 02:00"), 25.42);
typeA.add(Minute.parseMinute("2019-08-28 03:00"), 25.0);
typeA.add(Minute.parseMinute("2019-08-28 04:00"), 24.57);
typeA.add(Minute.parseMinute("2019-08-28 05:00"), 24.23);
typeA.add(Minute.parseMinute("2019-08-28 06:00"), 24.38);
typeA.add(Minute.parseMinute("2019-08-28 07:00"), 24.99);
typeA.add(Minute.parseMinute("2019-08-28 08:00"), 25.86);
typeA.add(Minute.parseMinute("2019-08-28 09:00"), 26.53);
typeA.add(Minute.parseMinute("2019-08-28 10:00"), 27.32);
typeA.add(Minute.parseMinute("2019-08-28 11:00"), 27.95);
typeA.add(Minute.parseMinute("2019-08-28 12:00"), 28.64);
typeA.add(Minute.parseMinute("2019-08-28 13:00"), 29.38);
typeA.add(Minute.parseMinute("2019-08-28 14:00"), 29.74);
typeA.add(Minute.parseMinute("2019-08-28 15:00"), 30.13);
typeA.add(Minute.parseMinute("2019-08-28 16:00"), 30.42);
typeA.add(Minute.parseMinute("2019-08-28 17:00"), 30.48);
typeA.add(Minute.parseMinute("2019-08-28 18:00"), 30.14);
typeA.add(Minute.parseMinute("2019-08-28 19:00"), 29.41);
typeA.add(Minute.parseMinute("2019-08-28 20:00"), 28.47);
typeA.add(Minute.parseMinute("2019-08-28 21:00"), 28.05);
return collection;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
TimeChart chart = new TimeChart(
"Date axis demo",
"Date axis labels are visible");
chart.pack();
chart.setVisible(true);
}
});
}
}
请注意，我已经将首选图表大小更改为1529 x 538（我需要生成一个具有此大小的PNG），并且我还引入了一个名为lot_of_values的新静态变量。最初，它被设置为假，下面是一个屏幕截图：
但是，如果我将lot_of_values更改为true（这将向集合中添加更多数据——您可以在源代码中看到），域轴的最后一个标签将被剪切。下面是一个屏幕截图，其中包含大量的值=true：
更新2
我已经挖掘了JFreeChart的资源，我正在解决这个问题。（我还不得不从上面的源代码中删除一些行，以符合30k字符的限制）
考虑下面的截图：
我认为边距值是在图表当前数据绘制之前和之后应用的，而不是应用于当前范围刻度。这就是为什么最后一个记号标签可以被剪掉
如果数据会一直填充到最后一个刻度（目前为2019-08-29 00:00），这不会是一个问题，因为在这种情况下，边距将允许正确打印该值
让我们看看这方面的概念证明。我在数据集中添加了三行：
typeA.add(Minute.parseMinute("2019-08-28 21:00"), 28.05); //original line
typeA.add(Minute.parseMinute("2019-08-28 22:00"), 28.05); //new line
typeA.add(Minute.parseMinute("2019-08-28 23:00"), 28.05); //new line
typeA.add(Minute.parseMinute("2019-08-29 00:00"), 28.05); //new line
现在结果是：
也可以通过调用以下命令来修改轴的最大日期：
timeAxis.setMaximumDate(new Date(119,7,29,4,36));
现在我将继续寻找这个最大日期的计算位置。如果有人知道，请告诉我
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