Hi,

You are calling RouteAllLinks after layout.Arrange, right? You will have to set the AnchorPattern of these nodes to one with an AnchorPoint at (50, 50) for RoutingOptions.Anchoring to work. Otherwise SpringLayout moves the link end point to the node border, and RouteAllLinks will keep it if there are no anchor points defined.

I hope that helps,
Stoyan

Yes, those methods will work only from the borders of rectangular nodes. Perhaps you should let SpringLayout place the links at the borders, and move them back to the center after calling Arrange.

Otherwise if the link end points don't lie at the node.Bounds rectangle, you will need to sort them by the angle their end segments make with the node. You can use the CarteseanToPolar method from this post to find the angles:
http://mindfusion.eu/Forum/YaBB.pl?board=diaglite_disc;action=display;num=127061...

and then divide the plane by 90 degree sections starting from 45, and add the links from each section to respectively the top/left/bottom/rightLinks collections in DistributeLinks. Let me know if you need help on this 8)

You should do something like this inside the nodes loop:

PointF center = node.GetCenter();
foreach (DiagramLink link in node.OutgoingLinks)
{
	link.ControlPoints[0] = center;
	link.UpdateFromPoints();
}
foreach (DiagramLink link in node.IncomingLinks)
{
	link.ControlPoints[last] = center;
	link.UpdateFromPoints();
} 

I hope that helps,
Stoyan

Yes, that will move them to the center as you wanted, but the other end of the link segment should stay at a position where the links will still be distributed. Alternatively you can keep these points at the borders, and insert the node center points at the beginning and end of ControlPoints. In that case you'd have to call UpdateControlPoints with the updateSegmentCount argument set to true.

You can offset link points at the end of the DistributeLinks method by iterating over each of the left/top/right/bottomLinks collections, and adding respectively +offset to x / + offset to y / - offset to x / -offset to y  depending on the current collection. The point you need to change is either ControlPoints[0] if link.Origin == node, or ControlPoints[Count-1] if link.Destination == node. For example:

foreach (DiagramLink link in leftLinks)
	OffsetPoint(link, node, +2, 0);

void OffsetPoint(DiagramLink link, DiagramNode node, float dx, float dy)
{
	var points = link.ControlPoints;
	int i = link.Origin == node ? 0 : points.Count - 1;
	var point = points[i];
	point.X += dx;
	point.Y += dy;
	points[i] = point;
	link.UpdateFromPoints();
} 

I hope that helps,
Stoyan