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Normal Topic Anchor Point Link Connection (Read 1489 times)
SAN
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Anchor Point Link Connection
Sep 26th, 2024 at 10:23am
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I have a node with 4 anchor points. Can I Restrict to link once for one anchor?
  
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Slavcho
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Re: Anchor Point Link Connection
Reply #1 - Sep 26th, 2024 at 12:12pm
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Try handling the validateAnchorPoint event:

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diagram.addEventListener(Events.validateAnchorPoint, onValidateAnchorPoint);

function onValidateAnchorPoint(sender, args)
{
    var outLinks = args.node.outgoingLinks;
    var inLinks = args.node.incomingLinks;
    args.cancel =
        outLinks.some((l) => l.originAnchor == args.anchorIndex) ||
        inLinks.some((l) => l.destinationAnchor == args.anchorIndex);
}


Regards,
Slavcho
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Re: Anchor Point Link Connection
Reply #2 - Sep 27th, 2024 at 7:55am
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I am using version 3.5.7. Any workaround for that as this event is not part of the version
  
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Slavcho
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Re: Anchor Point Link Connection
Reply #3 - Sep 27th, 2024 at 8:45am
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I guess you could reattach to a different anchor point from linkCreated event handler. Count all links that connect to same origin node / originAnchor and destination node / destinationAnchor pairs as the new link. If you find older links connecting to same points, reset originAnchor and / or destinationAnchor of new link to connect them to unused points.
  
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Re: Anchor Point Link Connection
Reply #4 - Sep 27th, 2024 at 11:29am
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Is there a possibility of cancelling the event all together for the new link creation. something like eventArgs.setcancel() if the destination anchor points for the links are the same
  
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Slavcho
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Re: Anchor Point Link Connection
Reply #5 - Sep 30th, 2024 at 7:22am
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You can cancel from linkCreating event handler. There's an internal anchorPointDetails object shown in use here -

https://mindfusion.eu/Forum/YaBB.pl?num=1524153022/1#1

and it also contains an index field specifying the point index.

Regards,
Slavcho
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