You want to remove Graphics Flicker ?

[KeLi]

I hate the thing what they did to Autoredraw on Controls & Forms...so i did a class that stops the object while it's painting in that way, the flicker is reduced, try it.

This is the class

Public Class IAutoRedraw
    Event AutoRedraw(ByVal g As System.Drawing.Graphics)

    Public Sub DoRedraw(ByVal g As System.Drawing.Graphics)
        Dim bDrawing As Boolean

        bDrawing = True
        While bDrawing
            RaiseEvent AutoRedraw(g)
            bDrawing = False
        End While
    End Sub
End Class

-----------------------------

This is how to use it:

	Private Withevents IA as New IAutoRedraw

	Private Sub IA_AutoRedraw(ByVal g As System.Drawing.Graphics) Handles IA.AutoRedraw
		'Do all your graphics stuff here
	End Sub

	'To use "Almost" FlickerFree Drawing, use: IA.DoRedraw
	'You can put in the Paint Event of you form, or anything.

[Hu Flung Dung]

Hmm. I'm not quite sure how thats supposed to remove graphics flicker. I tried your method in the following code (it moves a small bitmap in C:\vbtest.bmp around with the pointer) and I got the same flickering as if I wasn't even using your class.

    Public bmMyPic As New Bitmap("C:\vbtest.bmp")
    Public gFrm As Graphics
    Public intLastX As Integer
    Public intLastY As Integer
    Private WithEvents IA As New IAutoRedraw()

    Private Sub IA_AutoRedraw(ByVal g As System.Drawing.Graphics) Handles IA.AutoRedraw

        gFrm.Clear(Color.Gray)
        gFrm.DrawImage(bmMyPic, intLastX, intLastY)

    End Sub

    Private Sub Form2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.Width = 640
        Me.Height = 480
        gFrm = Me.CreateGraphics()

    End Sub

    Private Sub Form2_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove

        intLastX = e.X
        intlasty = e.Y
        IA.DoRedraw(gFrm)

    End Sub

    'To use "Almost" FlickerFree Drawing, use: IA.DoRedraw
    'You can put in the Paint Event of you form, or anything

End Class

I realize that its the gFrm.Clear() method that causes the flicker. However, for drawing animations like this, you have to call the Clear method. I have found a way to use a backbuffer for drawing graphics, which does get rid of flicker. Again, it moves a bitmap in C:\Vbtest.bmp around the form.

    Public bmMyPic As New Bitmap("C:\vbtest.bmp")
    Public bmBackBuffer As Bitmap
    Public gBackBuffer As Graphics
    Public gFrm As Graphics

    Private Sub Form3_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

        bmBackBuffer = New Bitmap(640, 480)

        Me.Width = 640
        Me.Height = 480

        gBackBuffer = Graphics.FromImage(bmBackBuffer)
        gFrm = Me.CreateGraphics()

    End Sub

    Public Sub RenderScene()

        gFrm.DrawImage(bmBackBuffer, 0, 0)

    End Sub

    Private Sub Form3_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove

        gBackBuffer.Clear(Color.Gray)
        gBackBuffer.DrawImage(bmMyPic, e.X, e.Y)
        RenderScene()

    End Sub

[MrPolite]

a lot of times enabling double buffering helps to remove flicker, completely. Put this in your from then redraw everything in the Paint event.

setstyle(ControlStyles.UserPaint, True)
        setstyle(ControlStyles.AllPaintingInWmPaint, True)
        setstyle(ControlStyles.DoubleBuffer, True)
 
'in the paint event....
      e.graphics.dowhatever

If it's a picture that's not gunno change, you can just draw it directly to the form's bg image and you wont need to redraw the image ( ie, if you declare a graphics object by doing Graphics.FromImage(form.backgroundimage) and then you draw on that, you wont need to redraw on it. but if you do form.CreateGraphics() and you draw on that, then you'll need to redraw)

[arimaknp]

You do not need to draw any controls. just copy the below code to anywhere in the form class preferably just above the end class and flicker will not be visible:

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreateParams
cp.ExStyle = cp.ExStyle Or &H2000000
Return cp
End Get
End Property

This is for VB.net only

Happy Learning

[.paul.]

You do not need to draw any controls. just copy the below code to anywhere in the form class preferably just above the end class and flicker will not be visible:

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreateParams
cp.ExStyle = cp.ExStyle Or &H2000000
Return cp
End Get
End Property

This is for VB.net only

Happy Learning

You do realize you've just revived a 16 year old thread??? I often stop for a moment to think about my answers, but 16 year thinking time is ridiculous

[boops boops]

You do realize you've just revived a 16 year old thread??? I often stop for a moment to think about my answers, but 16 year thinking time is ridiculous

Be fair, Paul, it's only 15 years old.
P.S. you just flunked Arithmetic 1.

[.paul.]

Ok, you got me. I looked at the Joined date instead of the thread date...

[Inside]

...and what version of VS.net did you get in 2002? VB6 is came out later...

[si_the_geek]

...and what version of VS.net did you get in 2002? VB6 is came out later...

VB6 was released in 1998, and the first proper release of .Net was VS 2002 (which included VB 7.0), but some of us had the .Net beta about a year earlier.

[jamesfalcon23]

Nice thanks for the reply dude!

Its crazy that this tread was created 20 years ago!

[Peter Porter]

Nice thanks for the reply dude!

Its crazy that this tread was created 20 years ago!

What's crazy is bumping this old thread back to the top, thanking a 5 year old reply as if it was written to you, after you joined VBForums yesterday.