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Normal Topic Node Distance in LayerdLayout (Read 3903 times)
KillaChris
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Node Distance in LayerdLayout
Jan 21st, 2013 at 10:58am
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Hello i have a problem with the node distance in the LayerdLayout.
I'm using Horizontal Orientation.
If there are only a few nodes everything is working allright. But if there are some more Nodes then the result looks very ugly.
My links are all AutoRoute = True
And the layout is created like this:
Code
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        layeredLt.Orientation = Layout.Orientation.Horizontal
        layeredLt.NodeDistance = 15
        layeredLt.LayerDistance = 35
        layeredLt.IgnoreNodeSize = False
        layeredLt.SplitLayers = False
        layeredLt.Margins = New System.Drawing.SizeF(15, 30)
        layeredLt.Arrange(diagramm)


Now i tried a lot of other values and other functions but I'm not able to get a better result.
As you can see in the Attachment there is a far distance between the "node groups" and because of that everything is really small.
It would be great if everything could be closer to each other, that it doesn't use that much place.
Well now i can zoom in but I have to scroll a lot and I'm not getting much information on the first view, because everything is split so far.
  
screen_002.jpg (Attachment deleted)
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Stoyo
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Re: Node Distance in LayerdLayout
Reply #1 - Jan 21st, 2013 at 2:09pm
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Hi,

Are you using some old version of the control? I'm getting more compact results as shown below, though I'm not sure how close this is to your graph. In any case, you might try connecting all your leaf nodes to a temporary destination node to bring them closer together, and removing the temp. node after layout.

Stoyan
  
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KillaChris
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Re: Node Distance in LayerdLayout
Reply #2 - Jan 21st, 2013 at 3:02pm
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No I'm using the latest Version (6?).
If I set IgnoreNodeSize to true then my result is compact as well, but then some Nodes cover other Nodes.
And adding such a "Help-Node" for the leaf nodes doesn't change the result either.
It's really strange somehow the layout creates some compact blocks, but the distance between this blocks is huge.
  
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Stoyo
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Re: Node Distance in LayerdLayout
Reply #3 - Jan 21st, 2013 at 4:59pm
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Could you attach here your diagram saved as XML file?
  
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KillaChris
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Re: Node Distance in LayerdLayout
Reply #4 - Jan 22nd, 2013 at 8:09am
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Yes. Here you are. I had to Zip the File, cause somehow .xml Extensions aren't allowed in the Forum-Attachments.
  
XmlDiag.zip (Attachment deleted)
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Stoyo
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Re: Node Distance in LayerdLayout
Reply #5 - Jan 22nd, 2013 at 11:45am
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Apparently the node size processing scales the layout grid too much when the nodes are as large as yours. Our developers will try to fix this for next release. For the time being you could leave IgnoreNodeSize enabled and offset overlapping nodes yourself after applying the layout:

Code
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ll.Arrange(diagram);

var layers = new Dictionary<int, List<DiagramNode>>();
foreach (var node in diagram.Nodes)
{
	if (!ll.Statistics.NodeLayerIndices.ContainsKey(node))
		continue;
	var l = ll.Statistics.NodeLayerIndices[node];
	if (!layers.ContainsKey(l))
		layers[l] = new List<DiagramNode>();
	layers[l].Add(node);
}

foreach (var layer in layers.Values)
{
	layer.Sort((n1, n2) => n1.Bounds.Y.CompareTo(n2.Bounds.Y));
	for (int i = 1; i < layer.Count; i++)
	{
		var node = layer[i];
		var prev = layer[i - 1];
		if (node.Bounds.Top <= prev.Bounds.Bottom)
			node.Move(node.Bounds.X, prev.Bounds.Bottom + 5);
	}
}


However this might lose the centering of nodes relative to their neighbors in adjacent layers.

I hope that helps,
Stoyan
  
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KillaChris
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Re: Node Distance in LayerdLayout
Reply #6 - Jan 22nd, 2013 at 1:26pm
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Okay.
Thank you very much with your workaround the result looks much better.
I hope that it'll work in the next version without that workaroud Smiley
  
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