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PODouble buffering C#
 

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    <p>I'm trying to implement the following method: void Ball::DrawOn(Graphics g);</p> <p>The method should draw all previous locations(stored in a queue) of the ball and finally the current location. I don't know if that matters, but I print the previous locations using g.DrawEllipse(...) and the current location using g.FillEllipse(...).</p> <p>The question is, that as you could imagine there is a lot of drawing to be done and thus the display starts to flicker much. I had searched for a way to double buffer, but all I could find is these 2 ways:</p> <p>1) System.Windows.Forms.Control.DoubleBuffered = true;</p> <p>2) SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);</p> <p>while trying to use the first, I get the an error explaining that from in this method the Property DoubleBuffered is inaccessible due to its protection level. While I can't figure how to use the SetStyle method.</p> <p>Is it possible at all to double buffer while <strong><em>all the access</em></strong> I have is to the Graphics Object I get as input in the method?</p> <p>Thanks in Advance,</p> <p>Edit: I had created the following class</p> <pre><code>namespace doubleBuffer { class BufferedBall : System.Windows.Forms.Form{ private Ball ball; public BufferedBall(Ball ball) { this.ball = ball; } public void DrawOn(Graphics g){ this.DoubleBuffered = true; int num = 0; Rectangle drawArea1 = new Rectangle(5, 35, 30, 100); LinearGradientBrush linearBrush1 = new LinearGradientBrush(drawArea1, Color.Green, Color.Orange, LinearGradientMode.Horizontal); Rectangle drawArea2 = new Rectangle(5, 35, 30, 100); LinearGradientBrush linearBrush2 = new LinearGradientBrush(drawArea2, Color.Black, Color.Red, LinearGradientMode.Vertical); foreach (PointD point in ball.previousLocations) { Pen myPen1; if (num % 3 == 0) myPen1 = new Pen(Color.Yellow, 1F); else if (num % 3 == 1) myPen1 = new Pen(Color.Green, 2F); else myPen1 = new Pen(Color.Red, 3F); num++; myPen1.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid; myPen1.StartCap = System.Drawing.Drawing2D.LineCap.RoundAnchor; myPen1.EndCap = System.Drawing.Drawing2D.LineCap.AnchorMask; g.DrawEllipse(myPen1, (float)(point.X - ball.radius), (float)(point.Y + ball.radius), (float)(2 * ball.radius), (float)(2 * ball.radius)); } if ((ball.Host.ElapsedTime * ball.Host.FPS * 10) % 2 == 0){ g.FillEllipse(linearBrush1, (float)(ball.Location.X - ball.radius), (float)(ball.Location.Y + ball.radius), (float)(2 * ball.radius), (float)(2 * ball.radius)); }else{ g.FillEllipse(linearBrush2, (float)(ball.Location.X - ball.radius), (float)(ball.Location.Y + ball.radius), (float)(2 * ball.radius), (float)(2 * ball.radius)); } } } </code></pre> <p>}</p> <p>and the ball drawOn looks like this:</p> <pre><code>new BufferedBall(this).DrawOn(g); </code></pre> <p>Is that what you meant? because it is still flickering?</p>
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    1. COWell, the SetStyle() way is correct, and you're doing it correct. AFAIK, the DoubleBuffered property shouldn't be used (SetStyle is preferred), but you can always subclass the Control/Form/whatever and use it there (it's protected).
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