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Winform Image Flickering

Posted on 2007-11-28
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Last Modified: 2013-12-16
Hi,
When I am loading the form the image which I draw on Paint is flickering. How do I avoid this?

 void Initial_Paint(object sender, System.EventArgs e)
 {
            Image newImage = Image.FromFile(ConfigurationManager.AppSettings["InitialFormImage"]);
            Graphics g = this.CreateGraphics();
            g.DrawImage(newImage, new Rectangle(new Point(CommonFunctions.GetWidth(60), CommonFunctions.GetHeight(100)), new Size(CommonFunctions.GetWidth(660), CommonFunctions.GetHeight(450))));
        }
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Question by:AdibRahman77
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by:jcoehoorn
ID: 20367312
You need a separate graphics object that you draw to, and then replace the entire image (or at least, the entire portion that changed) at once.

Google "double buffering" for more information.  The third link down is .Net specific and indicates .Net may have a feature that does most of the work for you.
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by:jcoehoorn
ID: 20367323
Hmm.. the sixth link down is even better.
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jcoehoorn earned 500 total points
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by:wizrr
ID: 20369706
And ofcourse you should not load that image every time OnPaint occurs. Hmm. Now i see that Initial_Paint is not paintevent, but you drawing from that method. You should draw only from OnPaint. Do not paint from another methods - this is OS rule, if you paint from another methods this is possible that OS will redraw (clean) all things you painted - that is why all can flicker.
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