/*********************************************************************************/
/* S U P P O R T M E T H O D S */
/*********************************************************************************/
private Edge CreateGraph(int howManyChildren, string nameRoot, out Edge randomInnerEdge)
{
randomInnerEdge = null;
m_edges = new ArrayList();
for (int i = 0; i < howManyChildren; i++)
{
Edge edge = new Edge(nameRoot + i);
if (i == ((int)howManyChildren / 2))
{
randomInnerEdge = edge;
}
//Debug.WriteLine("Creating edge " + edge.Name);
m_edges.Add(edge);
}
while (true)
{
// Select 2 edges, and connect them.
Edge edgeA = (Edge)((Edge)m_edges[m_random.Next(m_edges.Count)]);
Edge edgeB = (Edge)((Edge)m_edges[m_random.Next(m_edges.Count)]);
if (edgeA == edgeB)
{
continue;
}
//Debug.WriteLine(String.Format("Considering a connection between {0} and {1}.",edgeA.Name,edgeB.Name));
int forward = Graphs.Analysis.PathLength.ShortestPathLength(edgeA, edgeB);
int backward = Graphs.Analysis.PathLength.ShortestPathLength(edgeB, edgeA);
//Debug.WriteLine(String.Format("Forward path length is {0}, and reverse path length is {1}.",forward,backward));
if ((forward == int.MaxValue) && (backward == int.MaxValue))
{
edgeA.AddSuccessor(edgeB);
//Debug.WriteLine(String.Format("{0} will follow {1}.",edgeB.Name,edgeA.Name));
}
else if ((forward != int.MaxValue) && (backward == int.MaxValue))
{
edgeA.AddSuccessor(edgeB);
//Debug.WriteLine(String.Format("{0} will follow {1}.",edgeB.Name,edgeA.Name));
}
else if ((forward == int.MaxValue) && (backward != int.MaxValue))
{
edgeB.AddSuccessor(edgeA);
//Debug.WriteLine(String.Format("{1} will follow {0}.",edgeB.Name,edgeA.Name));
}
else
{
throw new ApplicationException("Cycle exists between " + edgeA.Name + " and " + edgeB.Name + ".");
}
// Once all edges are connected to something, we're done constructing the test.
bool allEdgesAreConnected = true;
foreach (Edge edge in m_edges)
{
if ((edge.PredecessorEdges.Count == 0) && (edge.SuccessorEdges.Count == 0))
{
allEdgesAreConnected = false;
break;
}
}
if (allEdgesAreConnected)
{
break;
}
}
Edge root = new Edge("Root");
foreach (Edge edge in m_edges)
{
if (edge.PreVertex.PredecessorEdges.Count == 0)
{
root.AddChildEdge(edge);
}
if (edge.PostVertex.SuccessorEdges.Count == 0)
{
root.AddChildEdge(edge);
}
}
return(root);
}