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/*=========================================================================
Program: Visualization Toolkit
Module: vtkExtractRectilinearGrid.h
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.
=========================================================================*/
// VTK includes
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkDoubleArray.h"
#include "vtkExtractRectilinearGrid.h"
#include "vtkMathUtilities.h"
#include "vtkPointData.h"
#include "vtkRectilinearGrid.h"
#include "vtkRectilinearGridWriter.h"
#include "vtkStructuredData.h"
// C/C++ includes
#include <cassert>
#include <cmath>
#include <sstream>
//#define DEBUG
double exponential_distribution(const int i, const double beta)
{
double xi = ( ( exp( i*beta ) - 1 ) /( exp( beta ) - 1 ) );
return( xi );
}
//------------------------------------------------------------------------------
void WriteGrid(vtkRectilinearGrid* grid, const std::string& file)
{
assert( "pre: input grid instance is NULL!" && (grid != NULL) );
std::ostringstream oss;
oss << file << ".vtk";
vtkRectilinearGridWriter* writer = vtkRectilinearGridWriter::New();
writer->SetFileName( oss.str().c_str() );
writer->SetInputData( grid );
writer->Write();
writer->Delete();
}
//------------------------------------------------------------------------------
int CheckGrid( vtkRectilinearGrid* grid )
{
int rc = 0;
vtkPointData* PD = grid->GetPointData();
if( !PD->HasArray("xyz") )
{
++rc;
return( rc );
}
vtkDoubleArray* xyz_data = vtkArrayDownCast<vtkDoubleArray>(PD->GetArray("xyz"));
double* xyz = static_cast<double*>( xyz_data->GetVoidPointer(0));
vtkIdType npoints = grid->GetNumberOfPoints();
for( vtkIdType pntIdx=0; pntIdx < npoints; ++pntIdx )
{
double* pnt = grid->GetPoint( pntIdx );
if( !vtkMathUtilities::NearlyEqual(pnt[0],xyz[pntIdx*3],1.e-9) ||
!vtkMathUtilities::NearlyEqual(pnt[1],xyz[pntIdx*3+1],1.e-9) ||
!vtkMathUtilities::NearlyEqual(pnt[2],xyz[pntIdx*3+2],1.e-9) )
{
std::cerr << "ERROR: point=(" << pnt[0] << ", ";
std::cerr << pnt[1] << ", ";
std::cerr << pnt[2] << ") ";
std::cerr << "data = (" << xyz[pntIdx*3] << ", ";
std::cerr << xyz[pntIdx*3+1] << ", ";
std::cerr << xyz[pntIdx*3+2] << ") ";
++rc;
} // END if
} // END for all points
return( rc );
}
//------------------------------------------------------------------------------
void GenerateGrid( vtkRectilinearGrid* grid, int ext[6] )
{
assert( "pre: input grid instance is NULL!" && (grid != NULL) );
grid->Initialize();
grid->SetExtent(ext);
vtkDataArray* coords[3];
int dims[3];
int dataDesc = vtkStructuredData::GetDataDescriptionFromExtent(ext);
vtkStructuredData::GetDimensionsFromExtent(ext,dims,dataDesc);
// compute & populate coordinate vectors
double beta = 0.05; /* controls the intensity of the stretching */
for(int i=0; i < 3; ++i)
{
coords[i] = vtkDataArray::CreateDataArray(VTK_DOUBLE);
if( dims[i] == 0 )
{
continue;
}
coords[i]->SetNumberOfTuples(dims[i]);
double prev = 0.0;
for(int j=0; j < dims[i]; ++j)
{
double val = prev + ( (j==0)? 0.0 : exponential_distribution(j,beta) );
coords[ i ]->SetTuple( j, &val );
prev = val;
} // END for all points along this dimension
} // END for all dimensions
grid->SetXCoordinates( coords[0] );
grid->SetYCoordinates( coords[1] );
grid->SetZCoordinates( coords[2] );
coords[0]->Delete();
coords[1]->Delete();
coords[2]->Delete();
// compute & populate XYZ field
vtkIdType npoints = vtkStructuredData::GetNumberOfPoints(ext,dataDesc);
vtkDoubleArray* xyz = vtkDoubleArray::New();
xyz->SetName( "xyz" );
xyz->SetNumberOfComponents(3);
xyz->SetNumberOfTuples( npoints );
for(vtkIdType pntIdx=0; pntIdx < npoints; ++pntIdx )
{
xyz->SetTuple(pntIdx, grid->GetPoint(pntIdx) );
} // END for all points
grid->GetPointData()->AddArray( xyz );
xyz->Delete();
}
//------------------------------------------------------------------------------
int TestExtractRectilinearGrid( int argc, char* argv[])
{
int rc = 0;
// silence compiler warnings
static_cast<void>(argc);
static_cast<void>(argv);
int ext[6] = {0,49,0,49,0,0};
vtkRectilinearGrid* grid = vtkRectilinearGrid::New();
GenerateGrid( grid, ext );
#ifdef DEBUG
WriteGrid( grid, "initial" );
#endif
int sub_ext[6] = {0,35,0,35,0,0};
vtkExtractRectilinearGrid* extractFilter = vtkExtractRectilinearGrid::New();
extractFilter->SetInputData( grid );
extractFilter->SetVOI(sub_ext);
extractFilter->SetSampleRate(2,2,1);
extractFilter->IncludeBoundaryOn();
extractFilter->Update();
vtkRectilinearGrid* subGrid = extractFilter->GetOutput();
#ifdef DEBUG
WriteGrid( subGrid, "sub-grid" );
#endif
rc += CheckGrid( subGrid );
extractFilter->Delete();
grid->Delete();
return( rc );
}
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