oxyplot - 图表两侧的 Y 轴

Question

我正在使用 oxyplot 库来创建时间序列图表。我正在尝试创建一个两侧具有相同 y 轴的绘图，只要我不与绘图交互以进行缩放或平移，它就可以正常工作，这是我的代码

      model.Axes.Add(new LinearAxis()
      {
        MajorStep = 0.1,
        Minimum = 0,
        Maximum = 1,
        Position = AxisPosition.Left,
        Title = "Title Axis",
        AxisTitleDistance = 10
      });

      model.Axes.Add(new LinearAxis()
      {
        Key = "RightYAxis"
        MajorStep = 0.1,
        Minimum = 0,
        Maximum = 1,
        Position = AxisPosition.Right
      });

      DateTimeAxis dta = new DateTimeAxis()
      {
        Key = "DateTimeAxis",
        IntervalType = SetDateTimeIntervalType(minDate, maxDate),
        StringFormat = "dd/MM/yyyy",
        Position = AxisPosition.Bottom,
        Minimum = DateTimeAxis.ToDouble(minDate),
        Maximum = DateTimeAxis.ToDouble(maxDate),
        Title = "Date",
        AxisTitleDistance = 10
      };
      dta.AxisChanged += new EventHandler<AxisChangedEventArgs>(AxisChanged);
      model.Axes.Add(dta);

当我与绘图交互时，只有左侧 y 轴和底部轴正在适当缩放。当我在左 y 轴之前添加右 y 轴时，底部和右侧轴正在缩放。

我需要设置什么设置，以相应地缩放两个 y 轴，而不仅仅是一个？

Answer 1

我认为没有内置设置。我过去遇到过类似的问题，也寻找过这样的功能，但没有找到。 OxyPlot 演示浏览器中也没有这样的示例。直截了当——但不是很优雅的方式——是将事件处理程序也附加到左轴，将最小值和最大值设置为右轴。您的示例将如下所示：

  Axis leftAxis = new LinearAxis()
  {
    MajorStep = 0.1,
    Minimum = 0,
    Maximum = 1,
    Position = AxisPosition.Left,
    Title = "Title Axis",
    AxisTitleDistance = 10
  });

  leftAxis.AxisChanged += LeftAxis_AxisChanged;
  model.Axes.Add(leftAxis);

  model.Axes.Add(new LinearAxis()
  {
    Key = "RightYAxis"
    MajorStep = 0.1,
    Minimum = 0,
    Maximum = 1,
    Position = AxisPosition.Right
  });

  DateTimeAxis dta = new DateTimeAxis()
  {
    Key = "DateTimeAxis",
    IntervalType = SetDateTimeIntervalType(minDate, maxDate),
    StringFormat = "dd/MM/yyyy",
    Position = AxisPosition.Bottom,
    Minimum = DateTimeAxis.ToDouble(minDate),
    Maximum = DateTimeAxis.ToDouble(maxDate),
    Title = "Date",
    AxisTitleDistance = 10
  };
  dta.AxisChanged += new EventHandler<AxisChangedEventArgs>(AxisChanged);
  model.Axes.Add(dta);

事件处理程序看起来像

    private void LeftAxis_AxisChanged(object sender, AxisChangedEventArgs e)
    {
        Axis leftAxis = sender as Axis;
        Axis rightAxis = leftAxis.PlotModel.Axes.First(a => a.Position == AxisPosition.Right);

        rightAxis.Maximum = leftAxis.ActualMaximum;
        rightAxis.Minimum = leftAxis.ActualMinimum;
    }