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/*=========================================================================
Program: Visualization Toolkit
Module: vtkElevationFilter.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.
=========================================================================*/
#include "vtkElevationFilter.h"
#include "vtkCellData.h"
#include "vtkDataSet.h"
#include "vtkFloatArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkSmartPointer.h"
vtkStandardNewMacro(vtkElevationFilter);
//----------------------------------------------------------------------------
vtkElevationFilter::vtkElevationFilter()
{
this->LowPoint[0] = 0.0;
this->LowPoint[1] = 0.0;
this->LowPoint[2] = 0.0;
this->HighPoint[0] = 0.0;
this->HighPoint[1] = 0.0;
this->HighPoint[2] = 1.0;
this->ScalarRange[0] = 0.0;
this->ScalarRange[1] = 1.0;
}
//----------------------------------------------------------------------------
vtkElevationFilter::~vtkElevationFilter()
{
}
//----------------------------------------------------------------------------
void vtkElevationFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Low Point: ("
<< this->LowPoint[0] << ", "
<< this->LowPoint[1] << ", "
<< this->LowPoint[2] << ")\n";
os << indent << "High Point: ("
<< this->HighPoint[0] << ", "
<< this->HighPoint[1] << ", "
<< this->HighPoint[2] << ")\n";
os << indent << "Scalar Range: ("
<< this->ScalarRange[0] << ", "
<< this->ScalarRange[1] << ")\n";
}
//----------------------------------------------------------------------------
int vtkElevationFilter::RequestData(vtkInformation*,
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
// Get the input and output data objects.
vtkDataSet* input = vtkDataSet::GetData(inputVector[0]);
vtkDataSet* output = vtkDataSet::GetData(outputVector);
// Check the size of the input.
vtkIdType numPts = input->GetNumberOfPoints();
if(numPts < 1)
{
vtkDebugMacro("No input!");
return 1;
}
// Allocate space for the elevation scalar data.
vtkSmartPointer<vtkFloatArray> newScalars =
vtkSmartPointer<vtkFloatArray>::New();
newScalars->SetNumberOfTuples(numPts);
// Set up 1D parametric system and make sure it is valid.
double diffVector[3] =
{ this->HighPoint[0] - this->LowPoint[0],
this->HighPoint[1] - this->LowPoint[1],
this->HighPoint[2] - this->LowPoint[2] };
double length2 = vtkMath::Dot(diffVector, diffVector);
if(length2 <= 0)
{
vtkErrorMacro("Bad vector, using (0,0,1).");
diffVector[0] = 0;
diffVector[1] = 0;
diffVector[2] = 1;
length2 = 1.0;
}
// Support progress and abort.
vtkIdType tenth = (numPts >= 10? numPts/10 : 1);
double numPtsInv = 1.0/numPts;
int abort = 0;
// Compute parametric coordinate and map into scalar range.
double diffScalar = this->ScalarRange[1] - this->ScalarRange[0];
vtkDebugMacro("Generating elevation scalars!");
for(vtkIdType i=0; i < numPts && !abort; ++i)
{
// Periodically update progress and check for an abort request.
if(i % tenth == 0)
{
this->UpdateProgress((i+1)*numPtsInv);
abort = this->GetAbortExecute();
}
// Project this input point into the 1D system.
double x[3];
input->GetPoint(i, x);
double v[3] = { x[0] - this->LowPoint[0],
x[1] - this->LowPoint[1],
x[2] - this->LowPoint[2] };
double s = vtkMath::Dot(v, diffVector) / length2;
s = (s < 0.0 ? 0.0 : s > 1.0 ? 1.0 : s);
// Store the resulting scalar value.
newScalars->SetValue(i, this->ScalarRange[0] + s*diffScalar);
}
// Copy all the input geometry and data to the output.
output->CopyStructure(input);
output->GetPointData()->PassData(input->GetPointData());
output->GetCellData()->PassData(input->GetCellData());
// Add the new scalars array to the output.
newScalars->SetName("Elevation");
output->GetPointData()->AddArray(newScalars);
output->GetPointData()->SetActiveScalars("Elevation");
return 1;
}
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