GoLayoutLayeredDigraph Class

GoLayoutLayeredDigraph provides an auto-layout for layered drawings of directed graphs.

Syntax

Visual Basic
C#

'Declaration
 
<SerializableAttribute()>
Public Class GoLayoutLayeredDigraph 
   Inherits GoLayout

[SerializableAttribute()]
public class GoLayoutLayeredDigraph : GoLayout

Remarks

The method uses a hierarchical approach for creating drawings of digraphs with nodes arranged in layers. The layout algorithm consists of four-major steps: Cycle Removal, Layer Assignment, Crossing Reduction, and Straightening and Packing.

Example

Typical usage: To lay out only a portion of a document, you will need to construct a GoLayoutLayeredDigraphNetwork, initialize it with just the nodes and links that you want to use, and set the Network property. Read the GoLayout User Guide for more details.

GoDocument doc = goView1.Document;
doc.StartTransaction();
GoLayoutLayeredDigraph layout = new GoLayoutLayeredDigraph();
layout.Document = doc;
layout.DirectionOption = GoLayoutDirection.Down;
layout.ColumnSpacing = 15;
layout.LayerSpacing = 10;
// ...maybe set other properties...
layout.PerformLayout();
doc.FinishTransaction("layout");

GoDocument doc = goView1.Document;
doc.StartTransaction();
GoLayoutLayeredDigraph layout = new GoLayoutLayeredDigraph();
layout.Document = doc;
layout.Network = layout.CreateNetwork();
// if you want to start off with the network representing the complete document,
// and then remove the nodes (or links) that you don't want:
layout.Network.AddNodesAndLinksFromCollection(doc, true);
foreach (GoObject obj in doc) {
  if (...obj is a node that you want to exclude from the layout...) {
    layout.Network.DeleteNode(obj);  // there is also a DeleteLink method
  }
}
layout.DirectionOption = GoLayoutDirection.Down;
layout.ColumnSpacing = 15;
layout.LayerSpacing = 10;
// ...maybe set other properties...
layout.PerformLayout();
doc.FinishTransaction("layout");

Inheritance Hierarchy

System.Object
   System.MarshalByRefObject
      System.ComponentModel.Component
         Northwoods.Go.Layout.GoLayout
            Northwoods.Go.Layout.GoLayoutLayeredDigraph

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

GoLayoutLayeredDigraph Members
Northwoods.Go.Layout Namespace