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Debugging trees - Manuel Abadia's ASP.NET stuff
# Saturday, 02 December 2006

I couldn’t resist to improve StructsViz in order to add support for trees. Even if everybody has his own tree implementation, we can come up with a common agreement:

A tree is a collection of nodes, where each node has zero or more child nodes. Each node has zero or one parent. The only node that doesn’t have a parent is the root node.

So based on the previous definition, I have defined this interface that is mandatory to implement in order to visualize a tree node in StructsViz:

public interface ITreeNode<T>


    T Value { get; set; }

    ITreeNode<T> Parent { get; set; }

    bool HasChildren { get; }

    ICollection<ITreeNode<T>> Children { get; }



I think that any tree node implementation can easily implement this interface.

With that interface implemented, StructsViz will be able to draw your tree node.

I have been playing a bit with automatic layout positioning for trees, and with different kind of connections:


The pictures show debug information of the subtree areas needed to position the elements properly using a recursive algorithm. For example, the rectangle labeled as ST 2, is the subtree area for node 2, and it is calculated based on the ST 6 and ST 7 (subtree areas for node 6 and 7 respectively). With ST 1, ST 2 and ST 3, we can properly position node 0.

I’m giving the final touches to this and it will be included in the next StructsViz version.

Saturday, 02 December 2006 17:17:59 (Romance Standard Time, UTC+01:00)  #    Comments [2]   ASP.NET | Microsoft .NET Framework  | 
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