I'm trying to implement a scrolling line chart (similar to the old chart recorders) by inheriting from the chart control. To do this, I need to do two things:
While I can do all this manually, I'd like to encapsulate everything into one custom control. I want to just add the custom control with the designer, and have all these properties set already and the behavior already included.
As a test, I have tried to just change the Text property of the inherited chart control, without success:
Public Class ScrollChart
Inherits Chart
Public Sub New()
Me.Text = "Test"
End Sub
End Class
And by overriding the Text property:
Public Class ScrollChart
Inherits Chart
Private _myText As String = "Test"
Public Overrides Property Text() As String
Get
Return _myText
End Get
Set(value As String)
_myText = value
End Set
End Property
End Class
I tried to change the Series chartType in two different ways:
Public Class ScrollChart
Inherits Chart
Friend WithEvents Chart1 As Chart
Private Sub InitializeComponent()
Dim ChartArea1 As System.Windows.Forms.DataVisualization.Charting.ChartArea = New System.Windows.Forms.DataVisualization.Charting.ChartArea()
Dim Legend1 As System.Windows.Forms.DataVisualization.Charting.Legend = New System.Windows.Forms.DataVisualization.Charting.Legend()
Dim Series1 As ScrollSeries = New ScrollSeries
Me.Chart1 = New System.Windows.Forms.DataVisualization.Charting.Chart()
CType(Me.Chart1, System.ComponentModel.ISupportInitialize).BeginInit()
CType(Me, System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'Chart1
'
ChartArea1.Name = "ChartArea1"
Me.Chart1.ChartAreas.Add(ChartArea1)
Legend1.Name = "Legend1"
Me.Chart1.Legends.Add(Legend1)
Me.Chart1.Location = New System.Drawing.Point(0, 0)
Me.Chart1.Name = "Chart1"
Series1.ChartArea = "ChartArea1"
Series1.Legend = "Legend1"
Series1.Name = "Series1"
Series1.ChartType = SeriesChartType.Line
Me.Chart1.Series.Add(Series1)
Me.Chart1.Size = New System.Drawing.Size(300, 300)
Me.Chart1.TabIndex = 0
Me.Chart1.Text = "Test"
CType(Me.Chart1, System.ComponentModel.ISupportInitialize).EndInit()
CType(Me, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
End Class
Public Class ScrollSeries
Inherits Series
Public Sub New()
MyBase.New()
Me.ChartType = SeriesChartType.Line
End Sub
End Class
In every case, the properties in the control I added using the designer did not change. I also tried to inherit the DataPointCollection, but can't because it has no exposed New(), and thus can't be inherited.
I suspect I need to replace the Series and DataPointCollection classes that my inherited Chart uses in order to change their properties and methods, but so far I'm at a loss on how to do so.
Create a user control (without inheriting) and add the chart control to it, then you can create properties on the user control that wrap the chart control. For example:
Public Property ChartText() As String
Get
Return Chart1.Text
End Get
Set(value As String)
Chart1.Text = value
End Set
End Property
In the ctor for your control you can assign any properties you want!
I don't see the benefit of inheriting in this case.
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