Code

ShapeNode AddNode(int lane)
{
	RectangleF laneBounds = GetLaneBounds(lane);
	RectangleF nodeBounds = new RectangleF(
	laneBounds.X + 15, laneBounds.Y + 15, 40, 30);
	foreach (DiagramNode node in GetLaneNodes(lane))
	{
		if (node.Bounds.Right > nodeBounds.X)
			nodeBounds.X = node.Bounds.Right + 20;
	}
	ShapeNode newNode = diagram.Factory.CreateShapeNode(nodeBounds);
	newNode.LayoutTraits["lane"] = lane;
	return newNode;
}

RectangleF GetLaneBounds(int lane)
{
	return new RectangleF(
		0, lane * 60, diagram.Bounds.Width, 60);
}

List<DiagramNode> GetLaneNodes(int lane)
{
	List<DiagramNode> laneNodes = new List<DiagramNode>();
	foreach (DiagramNode node in diagram.Nodes)
		if (node.LayoutTraits.Contains("lane") && lane.Equals(node.LayoutTraits["lane"]))
			laneNodes.Add(node);
	return laneNodes;
}