OK, here’s one way to associate one node with another node on the same layer. Just ignore that extra “fg” node, and pretend the “Loc” node is taller than it really is, to make room for positioning the “fg” node afterwards.
[code] public class TDKLayout : GoLayoutLayeredDigraph {
public override void PerformLayout() {
GoLayoutLayeredDigraphNetwork net = this.Network;
if (net == null) net = new GoLayoutLayeredDigraphNetwork(this.Document);
foreach (GoObject obj in this.Document) {
GoTextNode tn = obj as GoTextNode;
if (tn == null) continue;
if (tn.UserObject == null) continue;
GoTextNode near = (GoTextNode)tn.UserObject;
// delete all of those “fg” nodes from the network
net.DeleteNode(tn);
// increase the height of the “Loc” nodes to include the “fg” node
GoLayoutLayeredDigraphNode nearnode = net.FindNode(near);
if (nearnode != null) {
RectangleF bounds = near.Bounds;
bounds.Height += 20 + tn.Height;
nearnode.Bounds = bounds;
}
}
this.Network = net;
base.PerformLayout();
// now position all of those “fg” nodes
foreach (GoObject obj in this.Document) {
GoTextNode tn = obj as GoTextNode;
if (tn == null) continue;
if (tn.UserObject == null) continue;
GoTextNode near = (GoTextNode)tn.UserObject;
tn.SetSpotLocation(GoObject.MiddleTop, near, GoObject.MiddleBottom, 0, 20);
}
}
// to keep your code better organized, you'll probably want to put
// that other code for adding fake nodes for MidLabels, and for
// positioning those MidLabels afterwards, into the method above.
// just some test case initialization code...
public static void InitDoc(GoDocument doc) {
GoTextNode sup1 = new GoTextNode();
sup1.Text = "Sup1";
doc.Add(sup1);
GoTextNode loc1 = new GoTextNode();
loc1.Text = "Loc1";
doc.Add(loc1);
GoTextNode loc2 = new GoTextNode();
loc2.Text = "Loc2";
doc.Add(loc2);
GoTextNode dploc2 = new GoTextNode();
dploc2.Text = "DPLoc2";
doc.Add(dploc2);
GoTextNode fg1 = new GoTextNode();
fg1.Text = "fg1";
fg1.UserObject = loc1;
doc.Add(fg1);
GoTextNode fg2 = new GoTextNode();
fg2.Text = "fg2";
fg2.UserObject = loc2;
doc.Add(fg2);
doc.Add(MakeLink(sup1.RightPort, loc1.LeftPort));
doc.Add(MakeLink(loc1.RightPort, loc2.LeftPort));
doc.Add(MakeLink(loc2.RightPort, dploc2.LeftPort));
doc.Add(MakeLink(loc1.BottomPort, fg1.LeftPort));
doc.Add(MakeLink(fg1.RightPort, loc1.BottomPort));
doc.Add(MakeLink(loc2.BottomPort, fg2.LeftPort));
doc.Add(MakeLink(fg2.RightPort, loc2.BottomPort));
}
public static GoLink MakeLink(GoPort a, GoPort b) {
GoLink l = new GoLink();
l.ToArrow = true;
l.Style = GoStrokeStyle.Bezier;
l.FromPort = a;
l.ToPort = b;
return l;
}
}[/code]
Usage:
TDKLayout.InitDoc(doc); // create test case
TDKLayout layout = new TDKLayout();
layout.Document = doc;
layout.PerformLayout();
Result in version 3.0:
![]()
You might get different (vertical) alignment in version 2.x in more complicated cases than this simple one. (Sorry, I haven’t tried it in v2.6.)
Of course you can extend this to support additional associated nodes like the “fg” ones for each regular node like “Loc”. You’ll need to decide where to position those nodes relative to the main node.
Also, if you are using GoTextNode, remember that if you position a “fg” node above its “Loc” node, to avoid having the two connecting links cross over the “Loc” node, you’ll probably want to reconnect the two links so that they connect to the “Loc” node’s TopPort instead of its BottomPort as shown in the above example.