切换 JFreeChart 轴范围的上限

发布于 2024-12-17 08:58:36 字数 490 浏览 3 评论 0原文

我有一个图表，显示已完成的任务数量与时间的关系。在 Y 轴上，始终包含 0，并且有一个固定值，该值将是最大任务数。随着时间的推移，级数线攀升至最大值。这一切我都能做到。

我想要做的是允许用户在 Y 轴从 0 到 MAX 和 0 到自动范围值之间切换。这样，当它们距离最大值还很远时，它们就可以只放大数据，而不会使图表的上半部分为空。

JFreeChart chart = ChartFactory.createTimeSeriesChart("", "", "Progress", dataset, false, true, false);
XYPlot plot = chart.getXYPlot();
plot.getRangeAxis().setRange(new Range(0, TOTAL), false, true);

该行允许我显示整个值范围，但我无法设法将范围恢复为自动值，该值将上限设置为略高于系列中的最大值（如果您不这样做，它将呈现的方式）根本不设置范围）。

原文

I have a chart that graphs number of tasks completed versus time. On the Y-axis, 0 is always included and there is a fixed value that will be the maximum number of tasks. As time progresses, the line of the series climbs up to the maximum value. I can do all this.

What I want to be able to do is allow the user to switch between the Y-axis going from 0 to MAX and 0 to the auto range value. This way they can be zoomed in on just the data and not have the upper half of the graph empty when they are still far from the maximum value.

JFreeChart chart = ChartFactory.createTimeSeriesChart("", "", "Progress", dataset, false, true, false);
XYPlot plot = chart.getXYPlot();
plot.getRangeAxis().setRange(new Range(0, TOTAL), false, true);

That line allows me to show the entire value range, but I can't manage to get the range back to the auto value that sets the upper bound to just higher than the largest value in the series (The way it would render if you don't set the range at all).

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所谓喜欢 2024-12-24 08:58:36

作为一种权宜之计，您可以保留默认的范围：

Range auto = plot.getRangeAxis().getRange();

然后恢复它：

this.add(new JButton(new AbstractAction("Restore") {

    @Override
    public void actionPerformed(ActionEvent e) {
        JFreeChart chart = chartPanel.getChart();
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.getRangeAxis().setRange(auto);
    }
}), BorderLayout.SOUTH);

基于org.jfree.chart.demo.TimeSeriesChartDemo1。

As an expedient, you can preserve the default Range:

Range auto = plot.getRangeAxis().getRange();

and later restore it:

this.add(new JButton(new AbstractAction("Restore") {

    @Override
    public void actionPerformed(ActionEvent e) {
        JFreeChart chart = chartPanel.getChart();
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.getRangeAxis().setRange(auto);
    }
}), BorderLayout.SOUTH);

_{Notional example based on org.jfree.chart.demo.TimeSeriesChartDemo1.}

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