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/*=========================================================================
Program: Visualization Toolkit
Module: vtkImplicitDataSet.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 "vtkImplicitDataSet.h"
#include "vtkCell.h"
#include "vtkDataArray.h"
#include "vtkDataSet.h"
#include "vtkGarbageCollector.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
vtkStandardNewMacro(vtkImplicitDataSet);
vtkCxxSetObjectMacro(vtkImplicitDataSet,DataSet,vtkDataSet);
// Construct an vtkImplicitDataSet with no initial dataset; the OutValue
// set to a large negative number; and the OutGradient set to (0,0,1).
vtkImplicitDataSet::vtkImplicitDataSet()
{
this->DataSet = NULL;
this->OutValue = -VTK_DOUBLE_MAX;
this->OutGradient[0] = 0.0;
this->OutGradient[1] = 0.0;
this->OutGradient[2] = 1.0;
this->Weights = NULL;
this->Size = 0;
}
vtkImplicitDataSet::~vtkImplicitDataSet()
{
this->SetDataSet(NULL);
delete [] this->Weights;
}
// Evaluate the implicit function. This returns the interpolated scalar value
// at x[3].
double vtkImplicitDataSet::EvaluateFunction(double x[3])
{
vtkDataArray *scalars;
vtkCell *cell;
vtkIdType id;
int subId, i, numPts;
double pcoords[3], s;
if ( this->DataSet->GetMaxCellSize() > this->Size )
{
delete [] this->Weights;
this->Weights = new double[this->DataSet->GetMaxCellSize()];
this->Size = this->DataSet->GetMaxCellSize();
}
// See if a dataset has been specified
if ( !this->DataSet ||
!(scalars = this->DataSet->GetPointData()->GetScalars()) )
{
vtkErrorMacro(<<"Can't evaluate dataset!");
return this->OutValue;
}
// Find the cell that contains xyz and get it
cell = this->DataSet->FindAndGetCell(x,NULL,-1,VTK_DBL_EPSILON,subId,pcoords,this->Weights);
if (cell)
{ // Interpolate the point data
numPts = cell->GetNumberOfPoints();
for (s=0.0, i=0; i < numPts; i++)
{
id = cell->PointIds->GetId(i);
s += scalars->GetComponent(id,0) * this->Weights[i];
}
return s;
}
else
{ // use outside value
return this->OutValue;
}
}
unsigned long vtkImplicitDataSet::GetMTime()
{
unsigned long mTime=this->vtkImplicitFunction::GetMTime();
unsigned long DataSetMTime;
if ( this->DataSet != NULL )
{
DataSetMTime = this->DataSet->GetMTime();
mTime = ( DataSetMTime > mTime ? DataSetMTime : mTime );
}
return mTime;
}
// Evaluate implicit function gradient.
void vtkImplicitDataSet::EvaluateGradient(double x[3], double n[3])
{
vtkDataArray *scalars;
vtkCell *cell;
vtkIdType id;
int subId, i, numPts;
double pcoords[3];
if ( this->DataSet->GetMaxCellSize() > this->Size )
{
delete [] this->Weights;
this->Weights = new double[this->DataSet->GetMaxCellSize()];
this->Size = this->DataSet->GetMaxCellSize();
}
// See if a dataset has been specified
if ( !this->DataSet ||
!(scalars = this->DataSet->GetPointData()->GetScalars()) )
{
vtkErrorMacro(<<"Can't evaluate gradient!");
for ( i=0; i < 3; i++ )
{
n[i] = this->OutGradient[i];
}
return;
}
// Find the cell that contains xyz and get it
cell = this->DataSet->FindAndGetCell(x,NULL,-1,VTK_DBL_EPSILON,subId,pcoords,this->Weights);
if (cell)
{ // Interpolate the point data
numPts = cell->GetNumberOfPoints();
for ( i=0; i < numPts; i++ ) //Weights used to hold scalar values
{
id = cell->PointIds->GetId(i);
this->Weights[i] = scalars->GetComponent(id,0);
}
cell->Derivatives(subId, pcoords, this->Weights, 1, n);
}
else
{ // use outside value
for ( i=0; i < 3; i++ )
{
n[i] = this->OutGradient[i];
}
}
}
void vtkImplicitDataSet::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Out Value: " << this->OutValue << "\n";
os << indent << "Out Gradient: (" << this->OutGradient[0] << ", "
<< this->OutGradient[1] << ", " << this->OutGradient[2] << ")\n";
if ( this->DataSet )
{
os << indent << "Data Set: " << this->DataSet << "\n";
}
else
{
os << indent << "Data Set: (none)\n";
}
}
//----------------------------------------------------------------------------
void vtkImplicitDataSet::ReportReferences(vtkGarbageCollector* collector)
{
this->Superclass::ReportReferences(collector);
// These filters share our input and are therefore involved in a
// reference loop.
vtkGarbageCollectorReport(collector, this->DataSet, "DataSet");
}
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