同一数据上有多个轴 [英] Multiple axes on the same data

问题描述

我正在尝试在同一数据上有两个轴。

I'm trying to have two axes on the same data.

数据是几个 DefaultTableXYDatasets 。该图是 XYPlot ，我有两个 XYLineAndShapeRenderers 和一个 StackedXYAreaRenderer2 。

The data is a couple of DefaultTableXYDatasets. The plot is a XYPlot, and I have two XYLineAndShapeRenderers and one StackedXYAreaRenderer2.

y值的所有数据都以米为单位，我想让一个轴以米为单位显示，一个轴以英尺显示。现在这感觉很常见，但我无法决定最明显的方法。一种方法是复制数据并使y值以英尺为单位，然后添加另一个 NumberAxis 并完成它。

All data is in meters for the y-values, and I want to have one axis displaying it in meters and one axis displaying it in feet. Now this feels like a common thing to do, but I can't decide on the most obvious way to do it. One way that works would be to duplicate the data and have the y-values in feet, then add another NumberAxis and be done with it.

但我认为继承 NumberAxis 更为明智，或者将一些功能注入 NumberAxis 来缩放值。或者我应该采用第一种方法？

But I thought it would be wiser to subclass NumberAxis, or inject some functionality into NumberAxis to scale the values. Or should I go with the first approach?

您怎么看？

推荐答案

最终我决定使用这个解决方案，它可能不是最优雅但它有效。我有第二个轴 feetAxis ，并在名为 meterAxis <的第一个轴上添加了 AxisChangeListener / code>。当 meterAxis 更改时，设置 feetAxis 的范围。

Eventually i settled on this solution, it might not be the most elegant but it worked. I have a second axis feetAxis, and added a AxisChangeListener on the first axis called meterAxis. When the meterAxis changes set the range on feetAxis.

我使用 SwingUtilities.invokeLater ，否则缩小图表时范围会不正确，然后 feetAxis 只会从0变为1.虽然没有检查原因。

I used SwingUtilities.invokeLater, otherwise the range would be incorrect when zooming out of the chart, then the feetAxis would only go from 0 to 1. Didn't check why though.

feetAxis = new NumberAxis("Height [ft]");
metersAxis = new NumberAxis("Height [m]");
pathPlot.setRangeAxis(0, metersAxis);
pathPlot.setRangeAxis(1, feetAxis);

metersAxis.addChangeListener(new AxisChangeListener() {

   @Override
   public void axisChanged(AxisChangeEvent event) {

       SwingUtilities.invokeLater(new Runnable() {

           @Override
           public void run() {
               feetAxis.setRange(metersAxis.getLowerBound() * MetersToFeet, metersAxis.getUpperBound() * MetersToFeet);
                }
           });
       }
   });

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