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Normal Topic Intense Flicker When Using Control Nodes (Read 4616 times)
benm
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Intense Flicker When Using Control Nodes
Dec 10th, 2008 at 9:54am
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Hello,

Forgive me if this has already been asked, but I was not able to find a solution on the forums. I am developing a project and so far I love FlowChart.Net but I am trying to use control nodes with a custom control I am also developing. When adding a few of these nodes and then panning the view, there are very ugly artifacts. Please take a quick look at the following screen capture video:



Any suggestions on how to improve this will be greatly appreciated. Also note that this does not occur when using the standard shape or table nodes.

Thanks!

-Ben
  
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Stoyo
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Re: Intense Flicker When Using Control Nodes
Reply #1 - Dec 10th, 2008 at 11:07am
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Try handling the ScrollChanged event like this:

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private void diagramView_ScrollChanged(object sender, System.EventArgs e)
{
	diagramView.Refresh();

	foreach (DiagramNode node in diagram.Nodes)
	{
		ControlNode host = node as ControlNode;
		if (host != null)
			host.Control.Refresh();
	}
}


I hope that helps,
Stoyan
  
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benm
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Re: Intense Flicker When Using Control Nodes
Reply #2 - Dec 10th, 2008 at 6:35pm
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Hi Stoyan,

Yes this helps quite a bit although as expected, the scrolling is now very slow and jumpy, especially if more than 5 nodes are placed. I wonder if there is some sort of double-buffering technique I could use, or if this is just a limitation of the GDI and something like DirectX would be needed to render smoothly. Any thoughts on this?

Thanks,
Ben
  
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Stoyo
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Re: Intense Flicker When Using Control Nodes
Reply #3 - Dec 11th, 2008 at 6:07am
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Hi Ben,

Unfortunately since every control in WinForms has its own window, it can't get much faster than that. From what I can see in the video, you could display your data using TableNodes that have some spanning rows and columns, instead of user controls. You could use the user control only as a more advanced in-place editor, by setting it from the CreateEditControl event handler.

Using custom controls as nodes works much better in WPF, so you might check the WPF version of Flowchart.NET:
https://mindfusion.eu/WpfDiagTrial.zip

I hope that helps,
Stoyan
  
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benm
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Re: Intense Flicker When Using Control Nodes
Reply #4 - Dec 11th, 2008 at 8:00am
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Great, I think I will give that a try and I will post the results.
  
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Re: Intense Flicker When Using Control Nodes
Reply #5 - Dec 30th, 2008 at 8:15am
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Update:

I redesigned the application in WPF using the WpfDiagram control and the results are perfect!



Thanks,
Ben
  
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Re: Intense Flicker When Using Control Nodes
Reply #6 - Dec 30th, 2008 at 8:31am
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It looks great 8)
  
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