Code

public class DrawLinkAtAnchorBehavior : ModifyBehavior
{
	protected internal DrawLinkAtAnchorBehavior(Diagram diagram) : base(diagram) {}

	public override InteractionState StartDraw(Point point)
	{
		DiagramNode node = Diagram.GetNodeAt(point, 3);
		if (node != null && node.AnchorPattern != null)
		{
			foreach (AnchorPoint ap in node.AnchorPattern.Points)
			{
				Rect r = node.Bounds;
				Point p = new Point(
					r.Width * ap.X / 100 + r.X,
					r.Height * ap.Y / 100 + r.Y);

					if (MindFusion.Utilities.Distance(p, point) < 10)
					{
						Debug.WriteLine("anchorpoint hit");
						return new DrawLinkImpl(Diagram).StartDraw(point);
					}
				}
			}

		return base.StartDraw(point);
	}
}

public class DrawLinkImpl : DrawLinksBehavior
{
	protected internal DrawLinkImpl(Diagram diagram) : base(diagram) {}
}
 

Code

diagram.ShowAnchors = ShowAnchors.Auto;
diagram.CustomBehavior = new DrawLinkAtAnchorBehavior(diagram);