Can't Draw Line in Picture Box

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I'm new at this.

How come this doesn't work...

VB.NET Syntax (Toggle Plain Text)
 Private Sub ColorKeyForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        'Draws diagonal line of dot and dash on form
        Dim objGraphics As Graphics = Me.CreateGraphics
        Dim objPen As Pen
        objPen = New Pen(Drawing.Color.DarkBlue, 3)
        objPen.DashStyle = Drawing2D.DashStyle.DashDot
        objGraphics.DrawLine(objPen, 20, 20, 400, 400)
 
 
        'Next routine does nothing
        Dim objPicGraphics As Graphics = picColorKey.CreateGraphics
        objPen = New Pen(Drawing.Color.Chartreuse, 5)
        objPen.DashStyle = Drawing2D.DashStyle.Dot
        objPicGraphics.DrawLine(objPen, 20, 20, 400, 400)
 
    End Sub
 Private Sub ColorKeyForm_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
        'Draws diagonal line of dot and dash on form
        Dim objGraphics As Graphics = Me.CreateGraphics
        Dim objPen As Pen
        objPen = New Pen(Drawing.Color.DarkBlue, 3)
        objPen.DashStyle = Drawing2D.DashStyle.DashDot
        objGraphics.DrawLine(objPen, 20, 20, 400, 400)

  
        'Next routine does nothing
        Dim objPicGraphics As Graphics = picColorKey.CreateGraphics
        objPen = New Pen(Drawing.Color.Chartreuse, 5)
        objPen.DashStyle = Drawing2D.DashStyle.Dot
        objPicGraphics.DrawLine(objPen, 20, 20, 400, 400)

    End Sub

... the top part draws a line on the form but the second part does nothing. The picColorKey is a picture box on the form.

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OldQBasicer

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Feb 8th, 2010

Re: Can't Draw Line in Picture Box

Handle paint event of picColorKey,

VB.NET Syntax (Toggle Plain Text)
 Private Sub picColorKey_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
        Dim objPen As Pen
        Dim objPicGraphics As Graphics = e.Graphics
 
        objPen = New Pen(Drawing.Color.Red, 5)
        objPen.DashStyle = Drawing2D.DashStyle.Solid
        objPicGraphics.DrawLine(objPen, 20, 20, 400, 400)
    End Sub
 Private Sub picColorKey_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
        Dim objPen As Pen
        Dim objPicGraphics As Graphics = e.Graphics

        objPen = New Pen(Drawing.Color.Red, 5)
        objPen.DashStyle = Drawing2D.DashStyle.Solid
        objPicGraphics.DrawLine(objPen, 20, 20, 400, 400)
    End Sub

adatapost

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Feb 9th, 2010

Re: Can't Draw Line in Picture Box

Thanks, that worked!

OldQBasicer

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