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#include <vtkMutableDirectedGraph.h>
#include <vtkTree.h>
#include <vtkNew.h>
#include <vector>
#include "vtkTreeDFSIterator.h"
int TestTreeDFSIterator(int, char *[])
{
vtkNew<vtkMutableDirectedGraph> g;
// Create vertices:
vtkIdType v0 = g->AddVertex(); // Level 0
vtkIdType v1 = g->AddVertex(); // Level 1
vtkIdType v2 = g->AddVertex(); // Level 2
vtkIdType v3 = g->AddVertex(); // Level 2
vtkIdType v4 = g->AddVertex(); // Level 1
vtkIdType v5 = g->AddVertex(); // Level 2
vtkIdType v6 = g->AddVertex(); // Level 1
vtkIdType v7 = g->AddVertex(); // Level 2
vtkIdType v8 = g->AddVertex(); // Level 3
//create a fully connected graph
g->AddEdge(v0, v1);
g->AddEdge(v1, v2);
g->AddEdge(v1, v3);
g->AddEdge(v0, v4);
g->AddEdge(v4, v5);
g->AddEdge(v0, v6);
g->AddEdge(v6, v7);
g->AddEdge(v7, v8);
vtkNew<vtkTree> tree;
tree->CheckedShallowCopy(g.GetPointer());
std::vector<int> correctSequence;
for(int i = 0; i <= 8; i++)
{
correctSequence.push_back(i);
}
vtkNew<vtkTreeDFSIterator> dfsIterator;
dfsIterator->SetTree(tree.GetPointer());
if(dfsIterator->GetStartVertex() != tree->GetRoot())
{
cout << "StartVertex is not defaulting to root" << endl;
return EXIT_FAILURE;
}
//traverse the tree in a depth first fashion
for(size_t i = 0; i < correctSequence.size(); i++)
{
if(!dfsIterator->HasNext())
{
cout << "HasNext() returned false before the end of the tree" << endl;
return EXIT_FAILURE;
}
vtkIdType nextVertex = dfsIterator->Next();
if(nextVertex != correctSequence[i])
{
cout << "Next vertex should be " << correctSequence[i] << " but it is " << nextVertex << endl;
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
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