StrokeCollection.Draw Method

Public Class InkThumbnail
    Inherits FrameworkElement

    Private sourceInkCanvas As InkCanvas = Nothing 

    ' Get the InkCanvas that the user draws on. 
    Public Property Source() As InkCanvas
        Get 
            Return sourceInkCanvas
        End Get 

        Set(ByVal Value As InkCanvas)

            If Not sourceInkCanvas Is Nothing Then 

                ' Detach the event handler from the former InkCanvas. 
                RemoveHandler sourceInkCanvas.StrokeCollected, AddressOf SourceChanged
            End If

            sourceInkCanvas = Value


            If Not sourceInkCanvas Is Nothing Then 

                ' Attach the even handler to the InkCannvas 
                AddHandler sourceInkCanvas.StrokeCollected, AddressOf SourceChanged
            End If 

        End Set 
    End Property 

    ' Handle the StrokeCollection event of the InkCanvas. 
    Private Sub SourceChanged(ByVal sender As Object, ByVal e As InkCanvasStrokeCollectedEventArgs)

        ' Cause the thumbnail to be redrawn. 
        Me.InvalidateVisual()
    End Sub 


    Protected Overrides Sub OnRender(ByVal drawingContext As DrawingContext)

        MyBase.OnRender(drawingContext)

        ' Draw the strokes from the InkCanvas at 1/4 of their size.
        drawingContext.PushTransform(New ScaleTransform(0.25, 0.25))

        If Not sourceInkCanvas Is Nothing Then
            sourceInkCanvas.Strokes.Draw(drawingContext)
        End If 

    End Sub 

End Class