Java JFreeChart X轴标签超出图表区域
我有一个Java JFreeChart X轴标签超出图表区域,java,swing,jfreechart,Java,Swing,Jfreechart,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); Val
JFreeChartDateAxispublic 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 );
}
}
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
timeAxis.setMaximumDate(new Date(119,7,29,4,36));
现在我将继续查找这个最大日期的计算位置。如果有人知道，请让我知道。这种效果是人为减小图表的首选大小，同时显式增加日期轴刻度标签大小而造成的伪影。请注意，省略对
setPreferredSize（）timeAxis.setUpperMargin(DateAxis.DEFAULT_UPPER_MARGIN * 2);
timeAxis.setLowerMargin(DateAxis.DEFAULT_LOWER_MARGIN * 2);
DateAxissetVerticalTickLabels（）setMouseWheelEnabled（）我已经成功地调查并解决了这个问题 当JFreeChart决定其轴上的默认刻度时，它会计算标签的宽度并检查它们是否适合刻度，然后增加刻度，直到标签适合为止 这很好，但在此过程中，JFreeChart不会检查最后一个标签是否适合图表的绘图区域 要克服这种情况，您将有两项任务：
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.jfree.chart.axis.AxisState;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.ui.RectangleInsets;
import org.jfree.data.time.DateRange;
public class CorrectedDateAxis extends DateAxis {
/** For serialization. */
private static final long serialVersionUID = 0L;
/**
* Creates a date axis with no label.
*/
public CorrectedDateAxis() {
super(null);
}
/**
* Creates a date axis with the specified label.
*
* @param label the axis label ({@code null} permitted).
*/
public CorrectedDateAxis(String label) {
super(label);
}
/**
* Creates a date axis.
*
* @param label the axis label ({@code null} permitted).
* @param zone the time zone.
* @param locale the locale ({@code null} not permitted).
*/
public CorrectedDateAxis(String label, TimeZone zone, Locale locale) {
super(label, zone, locale);
}
/**
* Estimates the maximum width of the tick labels, assuming the specified
* tick unit is used.
* <P>
* Rather than computing the string bounds of every tick on the axis, we
* just look at two values: the lower bound and the upper bound for the
* axis. These two values will usually be representative.
*
* @param g2 the graphics device.
* @param unit the tick unit to use for calculation.
*
* @return The estimated maximum width of the tick labels.
*/
private double estimateMaximumTickLabelWidth(Graphics2D g2,
DateTickUnit unit) {
RectangleInsets tickLabelInsets = getTickLabelInsets();
double result = tickLabelInsets.getLeft() + tickLabelInsets.getRight();
Font tickLabelFont = getTickLabelFont();
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = tickLabelFont.getLineMetrics("ABCxyz", frc);
if (isVerticalTickLabels()) {
// all tick labels have the same width (equal to the height of
// the font)...
result += lm.getHeight();
}
else {
// look at lower and upper bounds...
DateRange range = (DateRange) getRange();
Date lower = range.getLowerDate();
Date upper = range.getUpperDate();
String lowerStr, upperStr;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
lowerStr = formatter.format(lower);
upperStr = formatter.format(upper);
}
else {
lowerStr = unit.dateToString(lower);
upperStr = unit.dateToString(upper);
}
FontMetrics fm = g2.getFontMetrics(tickLabelFont);
double w1 = fm.stringWidth(lowerStr);
double w2 = fm.stringWidth(upperStr);
result += Math.max(w1, w2);
}
return result;
}
@Override
public AxisState draw(Graphics2D g2, double cursor, Rectangle2D plotArea, Rectangle2D dataArea, RectangleEdge edge,
PlotRenderingInfo plotState) {
double labelWidth = estimateMaximumTickLabelWidth(g2, getTickUnit());
double lastLabelPosition = dateToJava2D(calculateHighestVisibleTickValue(getTickUnit()),
plotArea, edge);
if (lastLabelPosition + labelWidth / 2 > plotArea.getMaxX()) {
double plottingWidthCorrection = plotArea.getX() + (lastLabelPosition + labelWidth / 2) - plotArea.getMaxX();
// Calculate and set the new corrected maximum date
setMaximumDate(new Date((long)(getMaximumDate().getTime() + java2DToValue(plottingWidthCorrection, plotArea, edge) - getMinimumDate().getTime())));
}
return super.draw(g2, cursor, plotArea, dataArea, edge, plotState);
}
}
导入java.awt.Font；
导入java.awt.FontMetrics；
导入java.awt.Graphics2D；
导入java.awt.font.FontRenderContext；
导入java.awt.font.LineMetrics；
导入java.awt.geom.Rectangle2D；
导入java.text.DateFormat；
导入java.util.Date；
导入java.util.Locale；
导入java.util.TimeZone；
导入org.jfree.chart.axis.AxisState；
导入org.jfree.chart.axis.DateAxis；
导入org.jfree.chart.axis.DateTickUnit；
导入org.jfree.chart.plot.PlotRenderingInfo；
导入org.jfree.chart.ui.RectangleEdge；
导入org.jfree.chart.ui.rectangleInserts；
导入org.jfree.data.time.DateRange；
公共类CorrectedDateAxis扩展了DateAxis{
/**用于序列化*/
私有静态最终长serialVersionUID=0L；
/**
*创建没有标签的日期轴。
*/
公共更正日期轴（）{
超级（空）；
}
/**
*创建具有指定标签的日期轴。
*
*@param label轴标签（{@code null}允许）。
*/
公共更正日期轴（字符串标签）{
超级（标签）；
}
/**
*创建一个日期轴。
*
*@param label轴标签（{@code null}允许）。
*@param zone时区。
*@param locale区域设置（{@code null}不允许）。
*/
公共更正日期轴（字符串标签、时区、区域设置）{
超级（标签，
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.chart.ui.UIUtils;
import org.jfree.data.time.Day;
import org.jfree.data.time.Hour;
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 {
public TimeChart(String applicationTitle, String chartTitle) {
super(applicationTitle);
DateAxis timeAxis = new DateAxis("Timestamp");
timeAxis.setUpperMargin(DateAxis.DEFAULT_UPPER_MARGIN * 2);
timeAxis.setLowerMargin(DateAxis.DEFAULT_LOWER_MARGIN * 2);
timeAxis.setDateFormatOverride(new SimpleDateFormat("YYYY-MM-dd HH:mm"));
NumberAxis numberAxis = new NumberAxis("Number");
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(560 , 367);
}
};
add(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) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
TimeChart chart = new TimeChart(
"Date axis demo",
"Date axis labels are visible");
chart.pack();
UIUtils.centerFrameOnScreen(chart);
chart.setVisible(true);
}
});
}
}
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.text.DateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import org.jfree.chart.axis.AxisState;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickUnit;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.ui.RectangleInsets;
import org.jfree.data.time.DateRange;
public class CorrectedDateAxis extends DateAxis {
/** For serialization. */
private static final long serialVersionUID = 0L;
/**
* Creates a date axis with no label.
*/
public CorrectedDateAxis() {
super(null);
}
/**
* Creates a date axis with the specified label.
*
* @param label the axis label ({@code null} permitted).
*/
public CorrectedDateAxis(String label) {
super(label);
}
/**
* Creates a date axis.
*
* @param label the axis label ({@code null} permitted).
* @param zone the time zone.
* @param locale the locale ({@code null} not permitted).
*/
public CorrectedDateAxis(String label, TimeZone zone, Locale locale) {
super(label, zone, locale);
}
/**
* Estimates the maximum width of the tick labels, assuming the specified
* tick unit is used.
* <P>
* Rather than computing the string bounds of every tick on the axis, we
* just look at two values: the lower bound and the upper bound for the
* axis. These two values will usually be representative.
*
* @param g2 the graphics device.
* @param unit the tick unit to use for calculation.
*
* @return The estimated maximum width of the tick labels.
*/
private double estimateMaximumTickLabelWidth(Graphics2D g2,
DateTickUnit unit) {
RectangleInsets tickLabelInsets = getTickLabelInsets();
double result = tickLabelInsets.getLeft() + tickLabelInsets.getRight();
Font tickLabelFont = getTickLabelFont();
FontRenderContext frc = g2.getFontRenderContext();
LineMetrics lm = tickLabelFont.getLineMetrics("ABCxyz", frc);
if (isVerticalTickLabels()) {
// all tick labels have the same width (equal to the height of
// the font)...
result += lm.getHeight();
}
else {
// look at lower and upper bounds...
DateRange range = (DateRange) getRange();
Date lower = range.getLowerDate();
Date upper = range.getUpperDate();
String lowerStr, upperStr;
DateFormat formatter = getDateFormatOverride();
if (formatter != null) {
lowerStr = formatter.format(lower);
upperStr = formatter.format(upper);
}
else {
lowerStr = unit.dateToString(lower);
upperStr = unit.dateToString(upper);
}
FontMetrics fm = g2.getFontMetrics(tickLabelFont);
double w1 = fm.stringWidth(lowerStr);
double w2 = fm.stringWidth(upperStr);
result += Math.max(w1, w2);
}
return result;
}
@Override
public AxisState draw(Graphics2D g2, double cursor, Rectangle2D plotArea, Rectangle2D dataArea, RectangleEdge edge,
PlotRenderingInfo plotState) {
double labelWidth = estimateMaximumTickLabelWidth(g2, getTickUnit());
double lastLabelPosition = dateToJava2D(calculateHighestVisibleTickValue(getTickUnit()),
plotArea, edge);
if (lastLabelPosition + labelWidth / 2 > plotArea.getMaxX()) {
double plottingWidthCorrection = plotArea.getX() + (lastLabelPosition + labelWidth / 2) - plotArea.getMaxX();
// Calculate and set the new corrected maximum date
setMaximumDate(new Date((long)(getMaximumDate().getTime() + java2DToValue(plottingWidthCorrection, plotArea, edge) - getMinimumDate().getTime())));
}
return super.draw(g2, cursor, plotArea, dataArea, edge, plotState);
}
}