我正在使用 jFreeChart 来显示这种图：
好吧，问题是当程序在高度大于 800 像素的监视器上运行时，没有正确绘制暗阴影和 45 虚线。
我发现问题是由返回的错误值引起的：
chartPanel.getChartRenderingInfo().getPlotInfo().getSubplotInfo(0).getDataArea()
dataArea 不正确，高度错误，因此阴影未绘制在预期的位置。但这只发生在将窗口大小调整到~800px 高度以上时。
我已经设法用一个小的 SSCCE 重现了这个错误（需要 jcommon 和 jfreechart）：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.plot.CombinedDomainXYPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.RectangleInsets;
public class Window extends JFrame implements ComponentListener {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private XYPlot subplotTop;
private XYPlot subplotBottom;
private CombinedDomainXYPlot plot;
private JFreeChart chart;
private ChartPanel chartPanel;
private JLabel label;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window frame = new Window();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Window() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 700, 500);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel example = new JPanel();
label = new JLabel("Resize this window (do not use the \"maximize\" button");
example.add( label );
contentPane.add( example, BorderLayout.NORTH );
createTopChart();
createBottomChart();
createCombinedChart();
chartPanel = new ChartPanel(chart);
this.add(chartPanel, BorderLayout.CENTER);
//window resize listener
this.addComponentListener(this);
}
private void createTopChart() {
subplotTop = new XYPlot();
subplotTop.setDomainPannable(true);
subplotTop.setBackgroundPaint(Color.lightGray);
subplotTop.setDomainGridlinePaint(Color.white);
subplotTop.setRangeGridlinePaint(Color.white);
XYItemRenderer renderer = new XYLineAndShapeRenderer(true, false);
subplotTop.setRenderer(renderer);
NumberAxis range = new NumberAxis("dBA");
range.setRange(30, 120);
range.setAutoRange(false);
subplotTop.setRangeAxis(range);
TimeSeriesCollection dataset_L = randomDataset(30,120);
subplotTop.setDataset(dataset_L);
}
private void createBottomChart(){
subplotBottom = new XYPlot();
subplotBottom.setDomainPannable(true);
subplotBottom.setBackgroundPaint(Color.lightGray);
subplotBottom.setDomainGridlinePaint(Color.white);
subplotBottom.setRangeGridlinePaint(Color.white);
XYItemRenderer renderer = new XYLineAndShapeRenderer(true, false);
subplotBottom.setRenderer(renderer);
NumberAxis range = new NumberAxis("%");
range.setRange(-10, 100);
range.setAutoRange(false);
subplotBottom.setRangeAxis(range);
TimeSeriesCollection dataset_P = randomDataset(0,100);
subplotBottom.setDataset(dataset_P);
}
private void createCombinedChart() {
plot = new CombinedDomainXYPlot();
plot.setGap(30);
plot.add(subplotTop, 4);
plot.add(subplotBottom, 1);
plot.setOrientation(PlotOrientation.VERTICAL);
chart = new JFreeChart("Title", new Font("Arial", Font.BOLD, 18), plot, true);
chart.getLegend().setVisible(false);
chart.getLegend().setPosition(RectangleEdge.RIGHT);
chart.getTitle().setMargin(new RectangleInsets(15,5,15,5));
chart.getTitle().setPaint(Color.BLACK);
}
private TimeSeriesCollection randomDataset(float min, float max) {
return null;
}
private void showAreas() {
Rectangle2D screenDataAreaChartPanel = this.chartPanel.getScreenDataArea();
System.out.println("screenDataAreaChartPanel: "+screenDataAreaChartPanel);
Rectangle2D plotArea = this.chartPanel.getChartRenderingInfo().getPlotInfo().getPlotArea();
System.out.println("getPlotArea: "+plotArea.toString());
Rectangle2D dataAreaPlot = this.chartPanel.getChartRenderingInfo().getPlotInfo().getDataArea();
System.out.println("getDataArea: "+dataAreaPlot.toString());
Rectangle2D dataAreaSubplotTop = this.chartPanel.getChartRenderingInfo().getPlotInfo().getSubplotInfo(0).getDataArea();
Rectangle2D dataAreaSubplotBottom = this.chartPanel.getChartRenderingInfo().getPlotInfo().getSubplotInfo(1).getDataArea();
System.out.println("dataAreaSubplotTop: "+dataAreaSubplotTop.toString());
System.out.println("dataAreaSubplotBottom: "+dataAreaSubplotBottom.toString());
System.out.println();
label.setText("ScreenDataArea.height="+Math.round(screenDataAreaChartPanel.getHeight())+
". SubPlotTop.heigth="+Math.round(dataAreaSubplotTop.getHeight())+
". SubPlotBottom.heigth="+Math.round(dataAreaSubplotBottom.getHeight()));
repaint();
}
@Override
public void componentHidden(ComponentEvent e) {}
@Override
public void componentMoved(ComponentEvent e) { }
@Override
public void componentResized(ComponentEvent e) {
chartPanel.repaint();
chartPanel.revalidate();
this.repaint();
showAreas();
}
@Override
public void componentShown(ComponentEvent e) { }
}
我使用过 jfreechart v1.0.14 和 jcommon v1.0.18。在示例中，图表上方有三个值。你会看到三个值随着窗口变大而增长，但在大约 800 像素高度时，第一个值会继续增长，而其他值不会。为什么？
如果您没有大屏幕分辨率，您可能不会看到错误，因为它发生在我身上。
难道我做错了什么？那是一个错误吗？