我有一个使用JFreeChart
和DateAxis
作为横轴的图表。它看起来很好,但有时最后一个横轴标签会超出图表区域。以下是可复现该问题的示例代码:
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被渲染到当前图表区域之外?如何防止它发生?
更新
这里有一个更全面的例子,包括了所有细节和截图。
根据 @trashgod 的评论,我已经升级到最新的 JFreeChart 引擎 (jfreechart-1.0.19.jar 和 jcommon-1.0.23.jar) (jfreechart-1.6.0-snapshot.jar)。
考虑以下示例(深度依赖于 @trashgod 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://dev59.com/xrXna4cB1Zd3GeqPSeeV#57637615
* @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,我已将首选图表大小更改为1529 x 538(我需要生成一个PNG),并引入了一个名为lot_of_values的新静态变量。最初,它被设置为false,以下是其截图: 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),则域轴的最后一个标签将被切断。以下是lot_of_values=true时的截图:
更新2
我已经深入研究了JFreeChart的源代码,并正在解决问题。(此外,我还不得不从上面的源代码中删除一些行以适应30k字符限制)请考虑以下截图:
![enter image description here](https://istack.dev59.com/dFyky.webp)
如果数据填充到最后一个刻度(目前为2019-08-29 00:00),那么这将不是问题,因为在这种情况下,边距将允许正确打印该值。
让我们看一个概念证明。我向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
现在的结果如下所示:
![enter image description here](https://istack.dev59.com/DpIpu.webp)
timeAxis.setMaximumDate(new Date(119,7,29,4,36));
现在我将继续寻找计算MaximumDate的地方。如果有人知道,请告诉我。
JFrame
的默认布局是BorderLayout
;默认的位置是CENTER
,这允许图表面板调整大小;尝试使用DateAxis.DEFAULT_UPPER_MARGIN * 2
。 - trashgod