![]() we draw the progressbar into the image in the memoryĭrawProgressBar(ManagedBackBuffer.Graphics) clean up the memory if (ManagedBackBuffer != NO_MANAGED_BACK_BUFFER) GraphicManager.Allocate( this.CreateGraphics(), New Size( this.Width + 1, this.Height + 1) GraphicManager = BufferedGraphicsManager.Current NET Framework 1.1 and BufferedGraphics handles all the graphics operations like drawing the buffered image to the screen using the Render() function, etc.:Ĭonst BufferedGraphics NO_MANAGED_BACK_BUFFER = null BufferedGraphicsContext provides us an alternative buffer instead of the Bitmap that we used in. The new tools are BufferedGraphicsContext and BufferedGraphics. Microsoft has provided us with some useful tools to make it even easier. NET Framework 2.0, we can still use the manual way. Private void DoubleBufferedControl_Resize( object sender, Pe.Graphics.DrawImageUnscaled(BackBuffer) we draw the progressbar into the image in // the memory ![]() If (BufferGraphics != NO_BUFFER_GRAPHICS) clean up the memory if (BackBuffer != NO_BACK_BUFFER) Private void Memor圜leanup( object sender, EventArgs e) SetStyle(ControlStyles.AllPaintingInWmPaint, true) īackBuffer = new Bitmap( this.Width, this.Height) īufferGraphics = Graphics.FromImage(BackBuffer) Public partial class DoubleBufferedControl : ControlĬonst Graphics NO_BUFFER_GRAPHICS = null What we do here is create the double buffer ourselves and implement it by overriding the OnPaint event of a control or anything else that you might want to use it on: I should mention that when we set Control.DoubleBuffered to true, it will set the ControlStyles.AllPaintingInWmPaint and ControlStyles.OptimizedDoubleBuffer to true. The performance that we get by using this technique is very good and I recommend this for everyone who doesn't want to get into too much of coding. NET Framework 2.0, there is a big improvement in the ease and use of double buffering technique. we draw the progressbar normally with // the flags sets to our settings Protected override void OnPaint(PaintEventArgs pe) Public class DoubleBufferedControl : ControlĬontrolStyles.OptimizedDoubleBuffer, true) The parameter passed to it is a Graphics instance that is used for drawing: Setting this flag causes the control to repaint itself when resized.įor all these examples, I call a function called DrawProgressBar.
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