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Normal Topic Self loops (Read 2647 times)
danilom
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Self loops
Jan 31st, 2016 at 9:36pm
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Hi Stoyo,
I am using WPF diagramming v. 3.0.0.
When I try to connect two anchor points of the same node, the resulting link is a closed curve connecting a new anchor point above the node (see attachment).
I would like, instead, to see a standard cascading link connecting the real anchor points.
Can I obtain it?
Thanks in advance,
Danilo
  
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Slavcho
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Re: Self loops
Reply #1 - Feb 1st, 2016 at 10:17am
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Hello there,

See if you have SetSelfLoopShape event in version 3.0 and handle it by assigning link's OriginAnchor and DestinatinoAnchor and calling Route(). If SetSelfLoopShape is missing you'll just have to handle more events, like LinkCreated and LinkModified, and also check if the link has become a self-loop from their handlers.

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Slavcho
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danilom
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Re: Self loops
Reply #2 - Feb 1st, 2016 at 5:37pm
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Thanks Slavcho.
SetSelfLoopShape event seems not available.
could you please provide me a small code snippet for this issue?
Checking the Linkcreated event, seems that Origin and Destination Anchors are set correctly.
The Link shape has been forced to bezier and I'm not able to convert it back successfully as cascading.

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Danilo
  
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Slavcho
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Re: Self loops
Reply #3 - Feb 2nd, 2016 at 2:18pm
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Hello Danilo,

Shape setter could reject Cascading value if the link has only one segment. Set larger SegmentCount too before assigning to Shape -

Code
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private void OnLinkCreated(object sender, LinkEventArgs e)
{
	var link = e.Link;
	if (link.Origin == link.Destination)
	{
		link.SegmentCount = 3;
		link.Shape = LinkShape.Cascading;
		link.StartPoint = link.OriginConnection.
			GetAnchorPos(link.OriginAnchor);
		link.EndPoint = link.DestinationConnection.
			GetAnchorPos(link.DestinationAnchor);
		link.Route();
	}
}


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Slavcho
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danilom
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Re: Self loops
Reply #4 - Feb 2nd, 2016 at 2:40pm
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Wonderful, thanks a lot.
As usual, your support is extremely prompt and effective.
Bye,

Danilo
  
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