C＃图表中X轴上的时间 [英] Time on x-axis in C# charts

问题描述

我的 Windows窗体中具有以下图形：

我将X轴设置为显示时间，如下所示：

I set the X axis to display Time, as shown below:

以下是我用来绘制图形的方法：

Here are the methods I call to draw the graph:

        private void funcaoQualquer()
        {
            while (true)
            {
                funcaoArray[funcaoArray.Length - 1] = hScrollBar1.Value;
                Array.Copy(funcaoArray, 1, funcaoArray, 0, funcaoArray.Length - 1);
                if (chart1.IsHandleCreated)
                {
                    this.Invoke((MethodInvoker)delegate { atualizaGraficoFuncaoQualquer(hScrollBar1.Value); });
                }
                else
                {
                    //...
                }
                Thread.Sleep(250);
            }
        }

        private void atualizaGraficoFuncaoQualquer(int valor)
        {
            for (int i = 0; i < funcaoArray.Length - 1; ++i)
            {
                chart1.Series["Series1"].Points.Add(valor);
            }
        }

但是，绘制图形并随着时间推移， X轴不更改值。我认为它显示为小时。如何更改为分钟或秒？

However, when drawing the graph and over time, the X axis does not change the values. I think it's being displayed as hours. How do I change to minutes or seconds?

推荐答案

您可以将格式设置为：

this.chart1.ChartAreas[0].AxisX.LabelStyle.Format = "mm:ss";

如果采样率为4 Hz，则还可以使用秒和毫秒：

if you have a sampling rate of 4 Hz you could also use seconds and milliseconds:

this.chart1.ChartAreas[0].AxisX.LabelStyle.Format = "ss.fff";

编辑：

我建议在额外的 List< DateTime> 中捕获采样时间，并通过 AddXY 填充图表与价值观。这是一个使用计时器绘制曲线的简单程序。计时器设置为500毫秒。

I would suggest to catch the sampling times in an extra List<DateTime> and feed the chart via AddXY with values. Here is a simple programm that draws a curve with a timer. The timer is set to 500 msec.

// Constructor
public Form1()
{
    InitializeComponent();
    // Format
    this.chart1.ChartAreas[0].AxisX.LabelStyle.Format = "ss.fff";
    // this sets the type of the X-Axis values
    chart1.Series[0].XValueType = ChartValueType.DateTime;
    timer1.Start();
}

int i = 0;
List<DateTime> TimeList = new List<DateTime>();

private void timer1_Tick(object sender, EventArgs e)
{
    DateTime now = DateTime.Now;
    TimeList.Add(now);

    chart1.Series[0].Points.AddXY(now, Math.Sin(i / 60.0));
    i+=2;
}

现在，您可以按照自己喜欢的格式观看x轴值的增加。希望这会有所帮助

Now you can watch the x-axis values increment in the format that you like. Hope this helps

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