添加水平线以图在C＃ [英] Add horizontal line to chart in C#

问题描述

我使用的是 System.Windows.Forms.DataVisualization.Chart 来绘制一些X，Y分散数据，如：

  chart1.Series [系列2] Points.AddXY（字符串X，doubleY）;
 

1. 我想添加到图表的水平线上，平均形式为y =常数。 我怎样才能做到这一点？请注意，x轴是一个字符串

2. 其实，X轴是时间（HH：MM：SS）。我将其转换为字符串阴谋，因为如果我使用DateTime格式图表的X轴（XValueType）它不显示的秒数。 我可以纠正的，以显示秒，所以我可以直接打印x作为日期时间和y为双？

解决方案

对于第2点，您仍然可以设置 XValueType 到日期时间，但在适当的格式 LabelStyle 。

  chart1.Series [SeriesName] .XValueType = ChartValueType.DateTime;
//使用所需要的格式。我用下面的格式为例。
chart1.ChartAreas [ChartName] .AxisX.LabelStyle.Format =DD / MM / YY HH：MM：SS;
 

有关问题1，添加一个带状线的chartarea的Y轴。

 带状线带状线=新的带状线（）;
stripline.Interval = 0;
y轴的stripline.IntervalOffset =平均值;例如：35
stripline.StripWidth = 1;
stripline.BackColor = Color.Blue;
chart1.ChartAreas [ChartAreaName] .AxisY.StripLines.Add（带状线）;
 

I am using a System.Windows.Forms.DataVisualization.Chart to plot some x,y scatter data, like this:

chart1.Series["Series2"].Points.AddXY(stringX, doubleY);

1. I would like to add to that chart an horizontal line with an average of the form y = constant. How can I do this? Please, notice that the x axis is a string

2. Actually, the x axis is the time (hh:mm:ss). I am converting it to string to plot it because if I use the DateTime format for the x axis (XValueType) of the chart it doesn't show the seconds. Can I correct that to show the seconds so I can plot directly x as DateTime and y as double?

解决方案

For point 2, you can still set the XValueType to DateTime but with proper format in LabelStyle.

chart1.Series[SeriesName].XValueType = ChartValueType.DateTime;
// Use the required format. I used the below format as example.
chart1.ChartAreas[ChartName].AxisX.LabelStyle.Format = "dd/mm/yy hh:mm:ss";

For point 1, add a StripLine to the Y-Axis of the chartarea.

StripLine stripline = new StripLine();
stripline.Interval = 0;
stripline.IntervalOffset = average value of the y axis; eg:35
stripline.StripWidth = 1;
stripline.BackColor = Color.Blue;
chart1.ChartAreas[ChartAreaName].AxisY.StripLines.Add(stripline);

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