1
我使用的JFreeChart顯示這種情節： 
jFreeChart。組合圖表錯誤中的子圖的高度？
好了，問題是，當程序> 800像素高度黑影在監視器上運行，並且45虛線不正確地繪製。
我發現，這個問題是由返回錯誤值造成的：
chartPanel.getChartRenderingInfo().getPlotInfo().getSubplotInfo(0).getDataArea()
的DATAAREA是不正確的，高度是錯誤的，因此陰影不是畫在預期的位置。但是，這隻發生在調整大於800px高度的窗口時。
我已經成功地重現錯誤的小SSCCE（jcommon和jfreechart的需要）：
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) { }
}
我已經使用了JFreeChart v1.0.14和jcommon v1.0.18。 在該示例中，圖表上方有三個值。你會發現三個數值會隨着窗口變大而增大，但在800px左右的高度上，第一個值會保持增長，而其他值不會增加。爲什麼？
如果您沒有大屏幕分辨率，您可能不會看到錯誤，因爲它發生在我身上。
我做錯了什麼？這是一個錯誤？
+1 [sscce]（http://sscce.org/）。這個例子是否意味着空虛？ – trashgod 2013-03-26 11:34:18
是@trashgod沒有必要添加數據，錯誤同時出現有數據和沒有數據，所以它似乎沒有關聯 – TheBronx 2013-03-26 12:18:42
Cross-posted [here]（http://www.jfree.org/forum/viewtopic .PHP？F = 3＆T = 116448）。 – trashgod 2013-03-27 02:12:06