How can I stop the illumination of the form ? GDI+

How can I stop the illumination of the form ? GDI+

• Boise83716

  
  sorry I didn't understand it
  
  " Avoid it by painting the form area not covered by the bitmap "
  
  !!
  
  I'm trying to draw a non-rectangular form and I know that the G.Clear() causes the trouble but I call it to let my form become transparent .
  
  

• su45937

  I just have founded the best way and it has stopped the flickering forever
  
  Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
  e.Graphics.Clear(Color.Transparent)
  e.Graphics.DrawImage(BMP, 0, 0, 500, 500)
  End Sub
  
  and it's over .
  
  Thank you for participating your opinions with mine, see you soon in another thread .
  
  

• jortiz

  you can use double buffering to reduce flickering double buffering is drawing in offscreen and when finished it copy the graphics

  all you need to do to use double buffering is to SetStyle flags

  SetStyle method is protected so you can not access it except from inhertid class

  as you Drawing in the form you can write something like

  this.SetStyle(ControlStyles.UserPaint, true); //ControlStyles.UserPaint the control draw itself rather than operating system

  this.SetStyle(ControlStyles.AllPaintingInWmPaint, true); //reduce the flicker by ignoring WM_ERASEBKGND

  this.SetStyle(ControlStyles.DoubleBuffer, true);//drawin g in the buffer and display when finished

  for more info look at

  SetStyle

  ControlStyles

  and then do your painting in paint event handler

  
  
  

• keith_co

  sorry I didn't understand id " Avoid it by painting the form area not covered by the bitmap " !!
  
  I'm trying to draw a non-rectangular form and I know that the G.Clear() causes the trouble but I call it to let my form become transparent .
  
  

• Wojtek

  Ignore that please. I saw no evidence of flicker with this:
  
  mports System.Drawing.Drawing2D
  Imports System.Drawing
  Public Class Form1
  Dim BMP As New Bitmap("c:\temp\formback.bmp")
  Dim drg As Boolean = False, pnt As New Point()
  Dim rgn As Region
  Sub New()
  InitializeComponent()
  BMP.MakeTransparent(Me.TransparencyKey)
  Me.SetStyle(ControlStyles.UserPaint, True)
  Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
  Me.SetStyle(ControlStyles.OptimizedDoubleBuffer, True)
  End Sub
  Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
  drg = True
  pnt = e.Location
  End Sub
  Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
  If drg Then
  Me.Left += (e.X - pnt.X)
  Me.Top += (e.Y - pnt.Y)
  End If
  End Sub
  Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
  drg = False
  End Sub
  Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
  e.Graphics.Clear(Me.TransparencyKey)
  e.Graphics.DrawImage(BMP, 0, 0, 500, 500)
  End Sub
  
  End Class
  
  
  

• nglow

  The G.Clear() call causes the flicker. Avoid it by painting the form area not covered by the bitmap. And do *not* use the G member, use e.Graphics instead; you'll have problems when you resize the form.
  
  
  

• Mark from NH

  Thank you guys I'll try them and tell you what happened with me
  
  Thanx
  
  

• My Vizai

  Sorry Guys !!!
  I wanna stop the flickering for good, every thing I make just decreases the flickering but it doesn't stop it !
  
  Lets say that I wanna draw a skin for my application just like the windows media player, you can see that the windows media player doesn't flicker at all . How can I do it
  
  

• Amde

  sorry I didn't understand it " Avoid it by painting the form area not covered by the bitmap " !!
  
  I'm trying to draw a non-rectangular form and I know that the G.Clear() causes the trouble but I call it to let my form become transparent .
  
  

• peterjp

  This is the code but it is in VB.NET and I don't know why my thread has been moved to the C# forum, anyway I think you can understand it
  
  Imports System.Drawing.Drawing2D
  Imports System.Drawing
  Public Class Form1
  Dim BMP As New Bitmap("c:\1.png")
  Dim drg As Boolean = False, pnt As New Point()
  Dim G As Graphics, rgn As Region
  Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  BMP.MakeTransparent(Me.TransparencyKey)
  Me.SetStyle(ControlStyles.UserPaint, True)
  Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
  Me.SetStyle(ControlStyles.OptimizedDoubleBuffer, True)
  G = Me.CreateGraphics
  End Sub
  Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
  drg = True
  pnt = e.Location
  End Sub
  Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
  If drg Then
  Me.Left += (e.X - pnt.X)
  Me.Top += (e.Y - pnt.Y)
  End If
  End Sub
  Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp
  drg = False
  End Sub
  Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
  G.Clear(Me.TransparencyKey)
  G.DrawImage(BMP, 0, 0, 500, 500)
  End Sub
  End Class
  
  

• JacksonJones

  You may post your code this will help others to see the problem
  
  

• Software Engineer

  Try drawing in a PictureBox's OnPaint event. Set the PictureBox's DoubleBuffered property to True.
  
  Congrats on your freedom of choice...
  
  
  
• How can I stop the illumination of the form ? GDI+