JFreeChart MouseListener无法解析图表元素 [英] JFreeChart MouseListener doesn't resolve chart elements
问题描述
我有堆叠的条形图，我希望能够在其中选择堆叠中的各个条形.但是ChartMouseListener不会将ChartMouseEvent解析为相应的ChartEntity.这是听众的片段:
I've got stacked bar chart where I want to be able to select individual bars in the stack. But ChartMouseListener doesn't resolve ChartMouseEvent into corresponding ChartEntity. Here's the listener snippet :
public void chartMouseClicked(ChartMouseEvent event){
ChartEntity entity = event.getEntity();
if(entity != null && (entity instanceof XYItemEntity) ){
XYItemEntity item = (XYItemEntity)entity;
renderer.select(item.getSeriesIndex(), item.getItem());
return;
}
// deselect
renderer.select(-1,-1);
}
问题是当我显然单击某些栏时event.getEntity()返回null.请注意，并非所有障碍都失败了.我越靠近图表的右端，坐标移位就越明显.下面的快照显示了在所选栏外单击时实际显示的所选栏.我在SWT复合中使用JFreeChart.谁能确认这是错误的行为，还是有解决方法?
The problem is that event.getEntity() returns null when I am obviously clicking on some of the bars. Note that NOT all the bars fail. The further I go to the right end of the chart, the more obvious is the shift in coordinates. Snap shot below showing that selected bar actually appears when clicking outside of it. I am using JFreeChart within SWT composite. Can anyone confirm that this is a buggy behavior or is there a workaround?
下面是完整的 sscce ，在您运行它并单击栏后-它会显示小指.然后重新调整窗口大小并尝试选择栏-它会丢失.而且我认为错过的原因是新尺寸的作用.
Below is complete sscce, after you run it and click on bars - it will show up pinky. Then re-size the window and try to select bars - it will miss. And I think the miss is the function of the new size.
import java.awt.Color;
import java.awt.Paint;
import java.util.Random;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.DateTickMarkPosition;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StackedXYBarRenderer;
import org.jfree.chart.renderer.xy.StandardXYBarPainter;
import org.jfree.data.time.Day;
import org.jfree.data.time.Hour;
import org.jfree.data.time.TimeTableXYDataset;
import org.jfree.data.xy.TableXYDataset;
import org.jfree.experimental.chart.swt.ChartComposite;
public class StackedChartSwt {
private StackedRenderer renderer;
private Color[] colors = new Color[]{
new Color(230,240,255),
new Color(240,255,240),
new Color(255,255,255),
new Color(255,255,240),
new Color(255,240,240),
new Color(240,240,240)
};
public StackedChartSwt(){
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
JFreeChart chart = createStackedChart(createStackedDataset());
ChartComposite chartComposite = new ChartComposite(shell, SWT.NONE, chart, false, false, false, false, false);
chartComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
chartComposite.setRangeZoomable(false);
chartComposite.setMenu(null);
chartComposite.addChartMouseListener(new ThisMouseListener());
shell.setSize(800, 600);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
private JFreeChart createStackedChart(TableXYDataset tablexydataset) {
DateAxis dateaxis = new DateAxis();
dateaxis.setTickMarkPosition(DateTickMarkPosition.MIDDLE);
NumberAxis numberaxis = new NumberAxis("Event counts");
renderer = new StackedRenderer();
XYPlot plot = new XYPlot(tablexydataset, dateaxis, numberaxis, renderer);
plot.setBackgroundPaint(Color.white);
plot.setDomainGridlinePaint(Color.lightGray);
plot.setDomainGridlinesVisible(true);
plot.setRangeGridlinesVisible(true);
plot.setRangeGridlinePaint(Color.lightGray);
JFreeChart chart = new JFreeChart(null, plot);
chart.setBackgroundPaint(Color.white);
chart.setBorderVisible(false);
chart.setBorderPaint(null);
return chart;
}
class StackedRenderer extends StackedXYBarRenderer{
int selectedRow=-1, selectedCol=-1;
public StackedRenderer(){
setDrawBarOutline(true);
setBarPainter(new StandardXYBarPainter());
setShadowVisible(false);
setSeriesPaint(0, Color.blue);
setMargin(0.2);
}
public void select(int row, int col){
selectedRow = row;
selectedCol = col;
notifyListeners(new RendererChangeEvent(this));
}
@Override
public Paint getItemPaint(final int row, final int col){
if(row == selectedRow && col == selectedCol)
return Color.pink;
return colors[row];
}
}
class ThisMouseListener implements ChartMouseListener{
public void chartMouseMoved(ChartMouseEvent event){
}
public void chartMouseClicked(ChartMouseEvent event){
ChartEntity entity = event.getEntity();
if(entity != null && (entity instanceof XYItemEntity) ){
XYItemEntity item = (XYItemEntity)entity;
renderer.select(item.getSeriesIndex(), item.getItem());
return;
}
// deselect
renderer.select(-1,-1);
}
}
private TableXYDataset createStackedDataset(){
Random random = new Random(0);
TimeTableXYDataset ds = new TimeTableXYDataset();
Day day = new Day();
for( int i = 0; i < 24; i++ ){
Hour hour = new Hour( i, day );
ds.add(hour, random.nextInt( 20 ), "A");
ds.add(hour, random.nextInt( 20 ), "B");
ds.add(hour, random.nextInt( 20 ), "C");
ds.add(hour, random.nextInt( 20 ), "D");
ds.add(hour, random.nextInt( 20 ), "E");
ds.add(hour, random.nextInt( 20 ), "F");
}
return ds;
}
public static void main(String[] args){
new StackedChartSwt();
}
}
推荐答案
好的，我发现了问题.在SWT中，有多个构造函数可创建ChartComposite，大多数使用默认值来指定最小/最大宽度和高度.就我而言，只要将图表放大到DEFAULT_MAXIMUM_DRAW_WIDTH(800px)以上，坐标就会变得混乱.因此，解决方案是使用完整的构造函数并为您的显示指定相关边界.很难破解...主要是由于缺乏适当的文档.
OK, I've found the problem. In SWT there are several constructors to create ChartComposite, most of the use defaults which specify min/max width and height. In my case, whenever I've enlarged the chart above DEFAULT_MAXIMUM_DRAW_WIDTH (800px) - the coordinates start to get messy. So, the solution is to use full constructor and specify relevant boundaries for your display. It was a tough one to crack... mainly due to lack of proper documentation.
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