Intense Flicker When Using Control Nodes - Diagramming Components

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Intense Flicker When Using Control Nodes (Read 5244 times)

benm YaBB Newbies Offline I <3 MindFusion Posts: 32 Location: CA Joined: Dec 10^th, 2008	Intense Flicker When Using Control Nodes Dec 10^th, 2008 at 9:54am	Print Post
	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 God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Intense Flicker When Using Control Nodes Reply #1 - Dec 10^th, 2008 at 11:07am	Print Post
	Try handling the ScrollChanged event like this: Code 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 YaBB Newbies Offline I <3 MindFusion Posts: 32 Location: CA Joined: Dec 10^th, 2008	Re: Intense Flicker When Using Control Nodes Reply #2 - Dec 10^th, 2008 at 6:35pm	Print Post
	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 God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Intense Flicker When Using Control Nodes Reply #3 - Dec 11^th, 2008 at 6:07am	Print Post
	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 YaBB Newbies Offline I <3 MindFusion Posts: 32 Location: CA Joined: Dec 10^th, 2008	Re: Intense Flicker When Using Control Nodes Reply #4 - Dec 11^th, 2008 at 8:00am	Print Post
	Great, I think I will give that a try and I will post the results.


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benm YaBB Newbies Offline I <3 MindFusion Posts: 32 Location: CA Joined: Dec 10^th, 2008	Re: Intense Flicker When Using Control Nodes Reply #5 - Dec 30^th, 2008 at 8:15am	Print Post
	Update: I redesigned the application in WPF using the WpfDiagram control and the results are perfect! Thanks, Ben


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Intense Flicker When Using Control Nodes Reply #6 - Dec 30^th, 2008 at 8:31am	Print Post
	It looks great 8)


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