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我使用JFreeChart在柱状图中显示一些简单的数据。我在将数据集加载到图表并显示数据时没有问题,但是当我尝试使用复选框对数据进行排序时,我的问题就出现了。选中时,应显示来自year2001
的数据,如果取消选中,应显示来自所有年份的数据。从执行println,我可以看到复选框正在工作,并且来自Persons.getPersons().getCountSuccessYesMale()
的数据已更改,但图表未重新加载新数据。这里有什么问题?jFreeChart刷新数据集问题
public class ChartColumn extends JPanel {
private JCheckBox year2001;
private JCheckBox year2002;
private EventListener eventListener;
private int successMale;
public ChartColumn(EventListener eventListener) {
this.eventListener = eventListener;
}
public void update() {
this.createChart(this.createDataset());
this.showSelectionControl();
}
private CategoryDataset createDataset() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(Persons.getPersons().getCountSuccessYesMale(), "Success", "MALE");
dataset.addValue(Persons.getPersons().getCountSuccessNoMale(), "Fail", "MALE");
dataset.addValue(Persons.getPersons().getCountSuccessYesFemale(), "Success", "FEMALE");
dataset.addValue(Persons.getPersons().getCountSuccessNoFemale(), "Fail", "FEMALE");
return dataset;
}
public void createChart(CategoryDataset dataset) {
JFreeChart chart =
ChartFactory.createBarChart3D(
"Comparison between Male and Female in attending Meetings",
"Person Comparisons",
"No of Persons",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new Dimension(600, 300));
this.add(chartPanel);
}
public void showSelectionControl() {
year2001 = new JCheckBox("2001");
year2001.setMnemonic(KeyEvent.VK_C);
year2001.setSelected(true);
year2001.setActionCommand("2001");
year2001.addActionListener((ActionListener) this.eventListener);
year2002 = new JCheckBox("2002");
year2002.setMnemonic(KeyEvent.VK_G);
year2002.setSelected(true);
year2002.setActionCommand("2002");
year2002.addActionListener((ActionListener) this.eventListener);
this.add(year2001);
this.add(year2002);
}
}
事件监听其打电话的时候复选框有变化状态的更新方法:
class TabbedPaneEvent implements ActionListener {
public void actionPerformed(ActionEvent actionEvent) {
if (actionEvent.getActionCommand().equals("2001")) {
AbstractButton abstractButton = (AbstractButton)actionEvent.getSource();
boolean selected = abstractButton.getModel().isSelected();
if(selected == true){
Persons.setYear(1);
} else if(selected == false){
Persons.setYear(0);
}
Persons.calculateChartData();
chartColumn.update();
}
}
是的,这几乎工作。使用removeAll()时的问题是复选框(checked/unchecked)的状态被删除。我怎样才能删除/更新数据集? – jorgen 2011-03-28 12:46:01
而不是每次创建一个新的数据集,创建一次,然后清除并添加新的值。 – jzd 2011-03-28 12:48:36
是的!不能相信我以前没有这样做!非常感谢! – jorgen 2011-03-28 12:55:33