Chart控件绘制实时折线图表——Spline

Posted 2021-03-06 yunchen

1、首先，将chart控件添加到窗口。

2、设置chart - series 主要t属性：

2.1 IsXValueIndexed = true;

2.2 XValueType = Time;

3、编写初始化函数：

 Private Sub InitChart()
        Dim r As Random = New Random()

        Dim series As Series = Chart1.Series(0)
        Chart1.ChartAreas(0).AxisX.LabelStyle.Format = "HH:mm"
        Chart1.ChartAreas(0).AxisX.ScaleView.Size = 5

        series.ChartType = SeriesChartType.Spline;

        Chart1.ChartAreas(0).AxisX.ScrollBar.IsPositionedInside = True
        Chart1.ChartAreas(0).AxisX.ScrollBar.Enabled = True
       
        series.Points.AddXY(DateTime.Now.ToString("HH:mm"), r.Next(1, 100))
        If DateTime.Now.Second = 0 Then ‘因定时器与当前时间不准确,故判断当前时间秒数是否为0
            Timer1.Interval = 1000 * 60
        Else
            Timer1.Interval = 1000 * (60 - DateTime.Now.Second)
        End If

        Timer1.Start()

    End Sub

4.编写Time函数:

  Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
        Timer1.Stop()
        ‘Chart1.Series(0).Points.Clear()    ‘每次清除上一次绘制的数据
        Dim random As Random = New Random()
        Dim series As Series = Chart1.Series(0)
        series.Points.AddXY(DateTime.Now, random.Next(1, 20))

        If DateTime.Now.Second = 0 Then     ‘初始化定时器
            Timer1.Interval = 1000 * 60
        End If

        Timer1.Start()
    End Sub

5:在From_Load事件调用InitChart()方法

 

 

 

以上，借鉴博客

https://blog.csdn.net/lj22377/article/details/38373609?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task