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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFitImplicitFunction.cxx
Copyright (c) Kitware, Inc.
All rights reserved.
See LICENSE file 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 "vtkFitImplicitFunction.h"
#include "vtkObjectFactory.h"
#include "vtkPointSet.h"
#include "vtkPoints.h"
#include "vtkImplicitFunction.h"
#include "vtkSMPTools.h"
vtkStandardNewMacro(vtkFitImplicitFunction);
vtkCxxSetObjectMacro(vtkFitImplicitFunction,ImplicitFunction,vtkImplicitFunction);
//----------------------------------------------------------------------------
// Helper classes to support efficient computing, and threaded execution.
namespace {
//----------------------------------------------------------------------------
// The threaded core of the algorithm
template <typename T>
struct ExtractPoints
{
const T *Points;
vtkImplicitFunction *Function;
double Threshold;
vtkIdType *PointMap;
ExtractPoints(T *points, vtkImplicitFunction *f, double thresh, vtkIdType *map) :
Points(points), Function(f), Threshold(thresh), PointMap(map)
{
}
void operator() (vtkIdType ptId, vtkIdType endPtId)
{
const T *p = this->Points + 3*ptId;
vtkIdType *map = this->PointMap + ptId;
vtkImplicitFunction *f = this->Function;
double x[3], val;
double tMin = (-this->Threshold);
double tMax = this->Threshold;
for ( ; ptId < endPtId; ++ptId)
{
x[0] = static_cast<double>(*p++);
x[1] = static_cast<double>(*p++);
x[2] = static_cast<double>(*p++);
val = f->FunctionValue(x);
*map++ = ( (val >= tMin && val < tMax) ? 1 : -1 );
}
}
static void Execute(vtkFitImplicitFunction *self, vtkIdType numPts,
T *points, vtkIdType *map)
{
ExtractPoints extract(points, self->GetImplicitFunction(),
self->GetThreshold(), map);
vtkSMPTools::For(0, numPts, extract);
}
}; //ExtractPoints
} //anonymous namespace
//================= Begin class proper =======================================
//----------------------------------------------------------------------------
vtkFitImplicitFunction::vtkFitImplicitFunction()
{
this->ImplicitFunction = NULL;
this->Threshold = 0.01;
}
//----------------------------------------------------------------------------
vtkFitImplicitFunction::~vtkFitImplicitFunction()
{
this->SetImplicitFunction(NULL);
}
//----------------------------------------------------------------------------
// Overload standard modified time function. If implicit function is modified,
// then this object is modified as well.
vtkMTimeType vtkFitImplicitFunction::GetMTime()
{
vtkMTimeType mTime=this->MTime.GetMTime();
vtkMTimeType impFuncMTime;
if ( this->ImplicitFunction != NULL )
{
impFuncMTime = this->ImplicitFunction->GetMTime();
mTime = ( impFuncMTime > mTime ? impFuncMTime : mTime );
}
return mTime;
}
//----------------------------------------------------------------------------
// Traverse all the input points and extract those that lie near the surface
// of an implicit function.
int vtkFitImplicitFunction::FilterPoints(vtkPointSet *input)
{
// Check the input.
if ( !this->ImplicitFunction )
{
vtkErrorMacro(<<"Implicit function required\n");
return 0;
}
// Determine which points, if any, should be removed. We create a map
// to keep track. The bulk of the algorithmic work is done in this pass.
vtkIdType numPts = input->GetNumberOfPoints();
void *inPtr = input->GetPoints()->GetVoidPointer(0);
switch (input->GetPoints()->GetDataType())
{
vtkTemplateMacro(ExtractPoints<VTK_TT>::
Execute(this, numPts, (VTK_TT *)inPtr, this->PointMap));
}
return 1;
}
//----------------------------------------------------------------------------
void vtkFitImplicitFunction::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Implicit Function: "
<< static_cast<void *>(this->ImplicitFunction) << "\n";
os << indent << "Threshold: " << this->Threshold << "\n";
}
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