如何使用 C# 在双 Y 轴 ZedGraph 图中添加实时数据？

Question

对于我的项目，我需要向双 y 轴图添加和更新实时数据。 Y 和 Y2 值共享相同的 X 值，并且我已经创建了它。现在我有一个函数可以将新的点对添加到曲线列表中。

这是我的问题：我的 Y 和 Y2 值始终添加到第一条曲线的曲线列表中。如何将 Y2 值添加到图表中的第二个曲线列表中？

这是我的功能代码：

    private void AddDataToGraph(ZedGraphControl zg1, XDate xValue, double yValue1, double yValue2)
    {
        // Make sure that the curvelist has at least one curve.
        if (zg1.GraphPane.CurveList.Count <= 0)
            return;

        // Get the first CurveItem in the graph.
        LineItem curve = zg1.GraphPane.CurveList[0] as LineItem;

        if (curve == null)
            return;

        // Get the PointPairList.
        IPointListEdit list = curve.Points as IPointListEdit;
        IPointListEdit list2 = curve.Points as IPointListEdit;

        // If this is null, it means the reference at curve.Points does not
        // support IPointListEdit, so we won't be able to modify it.
        if (list == null || list2 == null)
            return;

        // Add new data points to the graph.
        list.Add(xValue, yValue1);
        list2.Add(xValue, yValue2);

        // Force redraw.
        zg1.Invalidate();
    }

如何将 Y2 值添加到第二条曲线列表中？

Answer 1

我自己找到了一个可能的解决方案。以下是我的代码更改：

private void AddDataToGraph(ZedGraphControl zg1, XDate xValue, double yValue1, double yValue2)
    {
        // Make sure that the curvelist has at least one curve
        if (zg1.GraphPane.CurveList.Count <= 0)
            return;

        // Get the first CurveItem in the graph
        LineItem curve = zg1.GraphPane.CurveList[0] as LineItem;
        LineItem curve2 = zg1.GraphPane.CurveList[1] as LineItem;

        if (curve == null || curve2 == null)
            return;

        // Get the PointPairList
        IPointListEdit list = curve.Points as IPointListEdit;
        IPointListEdit list2 = curve2.Points as IPointListEdit;
        // If this is null, it means the reference at curve.Points does not
        // support IPointListEdit, so we won't be able to modify it
        if (list == null || list2 == null)
            return;

        // add new data points to the graph
        list.Add(xValue, yValue1);
        list2.Add(xValue, yValue2);

        // force redraw
        zg1.Invalidate();
    }

重要的是使用“CurveList[i]”中的索引。因此，[0] 是我的 Y 值曲线，[1] 是我的 Y2 值曲线，依此类推。

我希望这可以帮助任何有相同或类似问题的人。

Answer 2

这是上面的“更好”的实现：

    private void AddDataToGraph(ZedGraphControl zg1, XDate xValue, double[] yValues)
    {
        GraphPane myPane = zg1.GraphPane;
        // Make sure that the curvelist has at least one curve
        if (myPane.CurveList.Count <= 0)
            return;
        else if (myPane.CurveList.Count != yValues.Length)
            return;

        for (int i = 0; i < yValues.Length; i++ )
        {
            ((IPointListEdit)myPane.CurveList[i].Points).Add(xValue, yValues[i]);
        }
        // force redraw
        zg1.Invalidate();
    }