MS 图表和 NaN

发布于 2024-08-22 02:57:32 字数 473 浏览 6 评论 0原文

我正在使用带有 C# 的 MS Chart，当我尝试从图表中检索几乎所有元值时遇到问题，我得到的只是 NaN。几个例子...

void chart_CursorPositionChanged(object sender, CursorEventArgs e)
{
            double selectStart = e.NewSelectionStart;
            double selectEnd = e.NewSelectionEnd;
}

e.NewSelectionStart and e.NewSelectionEnd both show NaN for their values.

另一个例子...

chart.ChartAreas[0].AxisX.Maximum

也是 NaN。但是，如果我将其设置为一个值，图表将正确反映它。有什么想法我做错了吗？

原文

I'm using MS Chart with C# and I'm having issues when I try to retrieve almost any meta values from the chart, all I am getting is NaN. Couple of examples...

void chart_CursorPositionChanged(object sender, CursorEventArgs e)
{
            double selectStart = e.NewSelectionStart;
            double selectEnd = e.NewSelectionEnd;
}

e.NewSelectionStart and e.NewSelectionEnd both show NaN for their values.

Another example...

chart.ChartAreas[0].AxisX.Maximum

is also NaN. However, if I set it to a value the chart properly reflects it. Any ideas what I'm doing wrong?

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北恋 2024-08-29 02:57:32

听起来您可能没有正确初始化 chart.ChartAreas[0]：您是否将 Cursor.IsUserSelectionEnabled 设置为 true？

chart.ChartAreas[0].CursorX.IsSelectionEnabled = true;

如果您尚未启用用户选择，则当用户单击并移动鼠标时，该事件仍会触发，但不会发生选择。

这意味着

chart.ChartAreas[0].AxisX.Maximum == Double.NaN

图表将自行管理保证金。

It sounds like you might not be properly initializing chart.ChartAreas[0]: Have you set Cursor.IsUserSelectionEnabled to true?

chart.ChartAreas[0].CursorX.IsSelectionEnabled = true;

If you haven't enabled user selecting then the event will still fire when a user clicks and moves the mouse, but a selection won't take place.

As for

chart.ChartAreas[0].AxisX.Maximum == Double.NaN

This means that the chart will manage the margin itself.

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终陌 2024-08-29 02:57:32

不要像您当前那样使用 CursorEventArgs 提供的数据，而是执行以下操作：

void chart_CursorPositionChanged(object sender, CursorEventArgs e)
{
            double selectStart = chart.ChartAreas["ChartArea1"].CursorX.SelectionStart;
            double selectEnd = chart.ChartAreas["ChartArea1"].CursorX.SelectionEnd;

}

我今天遇到了与您相同的问题，这为我解决了它。我不知道为什么 CursorEventArg 数据返回 NaN

Instead of using the data provided by CursorEventArgs like you currently are, do this:

void chart_CursorPositionChanged(object sender, CursorEventArgs e)
{
            double selectStart = chart.ChartAreas["ChartArea1"].CursorX.SelectionStart;
            double selectEnd = chart.ChartAreas["ChartArea1"].CursorX.SelectionEnd;

}

I experienced the same problem as you today, and this solved it for me. I dont know why the CursorEventArg data returns an NaN though

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