Hi Muthuhamid,

Internally CircularLayout finds a linear oder of nodes that ensures a small number of link crossings when nodes are placed on the rim of a circle. This should work for any convex shape, so you could reuse the internal implementation from the MindFusion.Graphs assembly to map the linear node order to a different shape, e.g. a square as shown below.

// create a graph object representing the diagram
var graphToDiagMapNodes = new Dictionary<Vertex, DiagramNode>();
var graphToDiagMapLinks = new Dictionary<Edge, DiagramLink>();
var graph = GraphFromDiagram(diagram, graphToDiagMapNodes, graphToDiagMapLinks);

// find node ordering that ensures small number of crossings
var drawing = new CircularDrawing(graph, 2);

// map the nodes linear order to a square shape
var sideLength = 100.0f;
var circumference = sideLength * 4;
var counter = 0;
foreach (Vertex vertex in drawing.VertexOrder)
{
	var cpos = counter * circumference / graph.Vertices.Count;
	var nodePos = new System.Drawing.PointF(0, 0);
	if (cpos < sideLength)
		// top side
		nodePos = new System.Drawing.PointF(cpos, 0);
	else if (cpos < sideLength * 2)
		// right side
		nodePos = new System.Drawing.PointF(sideLength, cpos - sideLength);
	else if (cpos < sideLength * 3)
		// bottom side
		nodePos = new System.Drawing.PointF(sideLength * 3 - cpos, sideLength);
	else
		// left side
		nodePos = new System.Drawing.PointF(0, sideLength * 4 - cpos);

	var node = graphToDiagMapNodes[vertex];
	node.Move(nodePos.X - node.Bounds.Width / 2, nodePos.Y - node.Bounds.Height / 2);
	counter++;
}
 

You can find the GraphFromDiagram code here:
http://mindfusion.eu/Forum/YaBB.pl?board=diaglite_disc;action=display;num=125001...

I hope that helps,
Stoyan