JFreeChart-具有垂直日期轴的条形图

Question

我需要制作纵轴上有日期的条形图。它将显示软件上次使用的时间戳。

它看起来像标准的条形图，但在垂直轴上，我需要日期，而不是数字。

感谢您的帮助

编辑：这是创建图表的工作示例，看起来就像我想要的一样。

private void createSoftwareLastUsageChart() throws ParseException {
    Date from = new Date(new Date().getTime() - (15 * 24 * 60 * 60 * 1000L));
    List<SwLastUsed> databaseStatisticsItems = getTestData();
    DefaultCategoryDataset dataset = new DefaultCategoryDataset();
    for (SwLastUsed soft : databaseStatisticsItems) {
        dataset.addValue(soft.lastUsed.getTime() - from.getTime(), "Software", soft.name);
    }
    JFreeChart chart = ChartFactory.createBarChart("Software last usage", "Values", "Time", dataset, PlotOrientation.VERTICAL, false, false, false);
    CategoryPlot plot = (CategoryPlot) chart.getPlot();
    CategoryAxis domainAxis = (CategoryAxis) plot.getDomainAxis();
    domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45);
    JFrame window = new JFrame();
    JPanel pnl = new JPanel();
    ChartPanel chPnl = new ChartPanel(chart);
    chPnl.setPreferredSize(new Dimension(800, 600));
    pnl.add(chPnl);
    window.setContentPane(pnl);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.pack();
    window.setVisible(true);
}
private List<SwLastUsed> getTestData() throws ParseException {
    List<SwLastUsed> sw = new ArrayList<>();
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    sw.add(new SwLastUsed("CHROME", format.parse("2014-11-03 11:24:20.456+01")));
    sw.add(new SwLastUsed("INTERNET_EXPLORER 10.* x64", format.parse("2014-11-03 11:15:28.124+01")));
    sw.add(new SwLastUsed("INTERNET_EXPLORER 11.*", format.parse("2014-11-03 11:15:28.124+01")));
    sw.add(new SwLastUsed("INTERNET_EXPLORER 10.* x86", format.parse("2014-11-03 11:08:35.359+01")));
    sw.add(new SwLastUsed("FIREFOX x86", format.parse("2014-10-21 09:38:17.109+02")));
    sw.add(new SwLastUsed("SAFARI", format.parse("2014-10-20 15:00:26.526+02")));
    sw.add(new SwLastUsed("FIREFOX x64", format.parse("2014-10-20 14:55:47.886+02")));
    return sw;
}
private class SwLastUsed {
    public String name;
    public Date lastUsed;
    public SwLastUsed(String name, Date lastUsed) {
        this.name = name;
        this.lastUsed = lastUsed;
    }
}

我想做的一件事是将左纵轴上以毫秒为单位的时间值更改为日期-时间格式。

Answer 1

使用ChartFactory.createXYBarChart()并指定true作为dateAxis参数，指定PlotOrientation.HORIZONTAL作为orientation参数。

Answer 2

DateAxis xAxis = new DateAxis("Date"); xAxis.setVerticalTickLabels(true); plot.setDomainAxis(xAxis);