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/*=========================================================================
Program: Visualization Toolkit
Module: vtkStrahlerMetric.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/*-------------------------------------------------------------------------
Copyright 2008 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkStrahlerMetric.h"
#include "vtkFloatArray.h"
#include "vtkObjectFactory.h"
#include "vtkOutEdgeIterator.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkDataSetAttributes.h"
#include "vtkSmartPointer.h"
//--------------------------------------------------------------------------
vtkStandardNewMacro(vtkStrahlerMetric);
vtkStrahlerMetric::vtkStrahlerMetric()
{
this->MaxStrahler = 0;
this->Normalize = 0;
this->MetricArrayName = 0;
this->SetMetricArrayName( "Strahler" );
}
vtkStrahlerMetric::~vtkStrahlerMetric()
{
this->SetMetricArrayName(0);
}
//----------------------------------------------------------------------------
float vtkStrahlerMetric::CalculateStrahler(
vtkIdType root,
vtkFloatArray *metric,
vtkTree *tree)
{
float strahler, maxStrahler, *childStrahler;
bool same;
vtkSmartPointer<vtkOutEdgeIterator> children
= vtkSmartPointer<vtkOutEdgeIterator>::New();
vtkIdType nrChildren = tree->GetNumberOfChildren(root);
// A leaf node has a Strahler value of 1.
if (nrChildren == 0)
{
strahler = 1.0;
}
else
{
// Non-leaf node: find the Strahler values of the children.
childStrahler = new float[nrChildren];
tree->GetOutEdges(root, children);
for (vtkIdType i = 0; i < nrChildren; i++)
{
childStrahler[i] = this->CalculateStrahler(
children->Next().Target,
metric,
tree);
}
// Determine if the children have the same strahler values
same = true;
maxStrahler = childStrahler[0];
for (vtkIdType j = 1; j < nrChildren; j++)
{
same = same && (maxStrahler == childStrahler[j]);
if (maxStrahler < childStrahler[j])
{
maxStrahler = childStrahler[j];
}
}
// Calculate the strahler value for this node
strahler = (same) ? maxStrahler + nrChildren - 1
: maxStrahler + nrChildren - 2;
delete [] childStrahler;
}
// Record the strahler value within the array.
metric->InsertValue(root, strahler);
if (strahler > this->MaxStrahler)
{
this->MaxStrahler = strahler;
}
return strahler;
}
int vtkStrahlerMetric::RequestData(vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkDebugMacro(<<"StrahlerMetric executing." );
// get the input and output
vtkTree *input = vtkTree::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkTree *output = vtkTree::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
// The output model should share the data of the input.
output->ShallowCopy(input);
// Create a new array to hold the metric.
vtkFloatArray *metric = vtkFloatArray::New();
metric->SetName(this->MetricArrayName);
metric->SetNumberOfValues(input->GetNumberOfVertices());
this->MaxStrahler = 1.0;
this->CalculateStrahler(
input->GetRoot(),
metric,
input);
if (this->Normalize)
{
for (vtkIdType i = 0; i < input->GetNumberOfVertices(); i++)
{
metric->SetValue(i, metric->GetValue(i)/this->MaxStrahler);
}
}
output->GetVertexData()->AddArray(metric);
metric->Delete();
vtkDebugMacro(<<"StrahlerMetric done.");
return 1;
}
void vtkStrahlerMetric::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Normalize: " << this->Normalize << endl;
os << indent << "MaxStrahler: " << this->MaxStrahler << endl;
os << indent << "MetricArrayName: " << (this->MetricArrayName ? this->MetricArrayName : "(none)") << endl;
}
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