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Overlapping edges with straight edges in Layered Algorithm [message #1817287]

Tue, 19 November 2019 20:45

Eclipse User

Hi,
I'm using the Layered algorithm to set a simple flow diagram with straight edges directly to a node but the edges is overlapping with another node.

Below is an example of a diagram that I have. I only used the node coordinates and ignored the edge coordinates after the algorithm layouts it.

Example graph node:

val graph = createGraph => [
            identifier = 'root'
        ]

        val start = graph.createNode => [
            width = 80
            height = 80
            identifier = 'start'
        ]

        val confirm = graph.createNode => [
            width = 80
            height = 80
            identifier = 'confirm'
        ]

        val finish = graph.createNode => [
            width = 80
            height = 80
            identifier = 'finish'
        ]
        start.createSimpleEdge(finish)
        start.createSimpleEdge(confirm)
        confirm.createSimpleEdge(finish)

Expected

Actual

Attachment: Screen Shot 2019-11-20 at 10.40.15 AM.png
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Attachment: Screen Shot 2019-11-20 at 10.40.32 AM.png
(Size: 22.26KB, Downloaded 330 times)

[Updated on: Tue, 19 November 2019 21:51] by Moderator

Re: Overlapping edges with straight edges in Layered Algorithm [message #1817300 is a reply to message #1817287]

Wed, 20 November 2019 03:27

Eclipse User

Such a result shouldn't happen with a default configuration (or any configuration, for that matter). Did you by any change happen to forget to apply y coordinates of nodes?

If not I guess we'll need more information. Do you apply layout from within Eclipse?

Re: Overlapping edges with straight edges in Layered Algorithm [message #1817353 is a reply to message #1817300]

Wed, 20 November 2019 19:14

Eclipse User

Hi, Christoph.
No. I used default config for that result.
I was able to get a better result with splines for edge routing.

index.php/fa/36795/0/

Attachment: Screen Shot 2019-11-21 at 8.09.52 AM.png
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[Updated on: Wed, 20 November 2019 19:15] by Moderator

Re: Overlapping edges with straight edges in Layered Algorithm [message #1817389 is a reply to message #1817353]

Thu, 21 November 2019 09:03

Eclipse User

That seems very strange to me. Are you using ELK within Eclipse or in another context?

Re: Overlapping edges with straight edges in Layered Algorithm [message #1817474 is a reply to message #1817287]

Fri, 22 November 2019 16:39

Eclipse User

Kevin King Agatep wrote on Wed, 20 November 2019 01:45

I only used the node coordinates and ignored the edge coordinates after the algorithm layouts it.

A colleague made me aware of the fact that I overlooked this part of your original post. The layout computed by the layout algorithm is almost certainly correct, but it decided to route the edge (Start -> Finish) around the Confirm node by introducing bend points. Since you don't apply the bend points, the edge simply crosses the Confirm node.

Bottom line: You cannot expect the layout to be correct if you throw away half of it. ;)

There is no way to configure the layout algorithm to produce node placements that guarantee that direct connections won't cause crossings. That it works for you with spline routing is probably just by chance.

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