VB.NET CHART图表示例

Imports System.Windows.Forms.DataVisualization.Charting

Imports System.Threading

Public Class Form1

Dim x(10) As String, y(10) As Double '示例中显示11条数据

Dim yy() As Double

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

'按钮单击事件模拟取数

yy = GetValue()

Dim i As Integer

For i = 0 To yy.Length - 1

y(i) = yy(i)

Next

Chart1.Series(0).ChartType = DataVisualization.Charting.SeriesChartType.Line

Chart1.Series(0).Points.DataBindXY(x, y)

Chart1.Series(0).IsValueShownAsLabel = True

Chart1.Series(0).LabelForeColor = Color.Red

Chart1.ChartAreas(0).AxisX.Minimum = 0

Chart1.ChartAreas(0).AxisX.Maximum = yy.Length

Chart1.ChartAreas(0).AxisX.Interval = 1

End Sub

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load

Timer1.Enabled = True

Timer1.Interval = 500

Chart1.Dock = DockStyle.Fill

'Button1.BringToFront()

Chart1.ChartAreas(0).AxisX.MajorGrid.Enabled = False

Chart1.ChartAreas(0).AxisY.MajorGrid.Enabled = False

End Sub

Function GetValue() As Array '这是一个模拟取数的函数

Dim a As Integer = 0

If yy Is Nothing Then

a = 0

Else

a = yy.Length

End If

If a = 11 Then

For i As Integer = 0 To 9

yy(i) = yy(i + 1)

x(i) = x(i + 1)

Next

yy(10) = Math.Round(a * Rnd(100) * 1.0264, 2)

x(10) = Format(Now, "hh:mm:ss")

Else

ReDim Preserve yy(a)

yy(a) = Math.Round(a * Rnd(100) * 1.0264, 2)

x(a) = Format(Now, "hh:mm:ss")

End If

Return yy

End Function

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

yy = GetValue()

Dim i As Integer

For i = 0 To yy.Length - 1

y(i) = yy(i)

Next

Chart1.Series(0).ChartType = DataVisualization.Charting.SeriesChartType.Line

Chart1.Series(0).Points.DataBindXY(x, y)

Chart1.Series(0).IsValueShownAsLabel = True

Chart1.Series(0).LabelForeColor = Color.Red

Chart1.ChartAreas(0).AxisX.Minimum = 0

Chart1.ChartAreas(0).AxisX.Maximum = yy.Length

Chart1.ChartAreas(0).AxisX.Interval = 1

End Sub

End Class