GoLayoutForceDirected Class

In This Topic

GoLayoutForceDirected provides an auto-layout algorithm for graphs which utilizes a force-directed method.

Syntax

[DesignerCategory("Component")]
[Serializable()]
public class GoLayoutForceDirected : GoLayout

Remarks

The graph is viewed as a system of bodies with forces acting between the bodies. The algorithm seeks a configuration of the bodies with locally minimal energy, i.e., a position such that the sum of the forces on each body is zero.

Example

Typical usage: To lay out only a portion of a document, you will need to construct a GoLayoutForceDirectedNetwork, 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();
GoLayoutForceDirected layout = new GoLayoutForceDirected();
layout.Document = doc;
// ...maybe set other properties...
layout.PerformLayout();
doc.FinishTransaction("layout");

GoDocument doc = goView1.Document;
doc.StartTransaction();
GoLayoutForceDirected layout = new GoLayoutForceDirected();
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
  }
}
// ...maybe set other properties...
layout.PerformLayout();
doc.FinishTransaction("layout");

Reference

GoLayoutForceDirected Members
Northwoods.Go.Layout Namespace

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