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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkImplicitSum.h"
#include "vtkDoubleArray.h"
#include "vtkImplicitFunctionCollection.h"
#include "vtkObjectFactory.h"
#include <cmath>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkImplicitSum);
//------------------------------------------------------------------------------
// Constructor.
vtkImplicitSum::vtkImplicitSum()
{
this->FunctionList = vtkImplicitFunctionCollection::New();
this->Weights = vtkDoubleArray::New();
this->Weights->SetNumberOfComponents(1);
this->TotalWeight = 0.0;
this->NormalizeByWeight = 0;
}
//------------------------------------------------------------------------------
vtkImplicitSum::~vtkImplicitSum()
{
this->FunctionList->Delete();
this->Weights->Delete();
}
//------------------------------------------------------------------------------
vtkMTimeType vtkImplicitSum::GetMTime()
{
vtkMTimeType fMtime;
vtkMTimeType mtime = this->vtkImplicitFunction::GetMTime();
vtkImplicitFunction* f;
fMtime = this->Weights->GetMTime();
if (fMtime > mtime)
{
mtime = fMtime;
}
vtkCollectionSimpleIterator sit;
for (this->FunctionList->InitTraversal(sit);
(f = this->FunctionList->GetNextImplicitFunction(sit));)
{
fMtime = f->GetMTime();
if (fMtime > mtime)
{
mtime = fMtime;
}
}
return mtime;
}
//------------------------------------------------------------------------------
// Add another implicit function to the list of functions.
void vtkImplicitSum::AddFunction(vtkImplicitFunction* f, double scale)
{
this->Modified();
this->FunctionList->AddItem(f);
this->Weights->InsertNextValue(scale);
this->CalculateTotalWeight();
}
//------------------------------------------------------------------------------
void vtkImplicitSum::SetFunctionWeight(vtkImplicitFunction* f, double scale)
{
int loc = this->FunctionList->IndexOfFirstOccurence(f);
if (loc < 0)
{
vtkWarningMacro("Function not found in function list");
return;
}
if (this->Weights->GetValue(loc) != scale)
{
this->Modified();
this->Weights->SetValue(loc, scale);
this->CalculateTotalWeight();
}
}
//------------------------------------------------------------------------------
void vtkImplicitSum::RemoveAllFunctions()
{
this->Modified();
this->FunctionList->RemoveAllItems();
this->Weights->Initialize();
this->TotalWeight = 0.0;
}
//------------------------------------------------------------------------------
void vtkImplicitSum::CalculateTotalWeight()
{
this->TotalWeight = 0.0;
for (int i = 0; i < this->Weights->GetNumberOfTuples(); ++i)
{
this->TotalWeight += this->Weights->GetValue(i);
}
}
//------------------------------------------------------------------------------
// Evaluate sum of implicit functions.
double vtkImplicitSum::EvaluateFunction(double x[3])
{
double sum = 0;
double c;
int i;
vtkImplicitFunction* f;
double* weights = this->Weights->GetPointer(0);
vtkCollectionSimpleIterator sit;
for (i = 0, this->FunctionList->InitTraversal(sit);
(f = this->FunctionList->GetNextImplicitFunction(sit)); i++)
{
c = weights[i];
if (c != 0.0)
{
sum += f->FunctionValue(x) * c;
}
}
if (this->NormalizeByWeight && this->TotalWeight != 0.0)
{
sum /= this->TotalWeight;
}
return sum;
}
//------------------------------------------------------------------------------
// Evaluate gradient of sum of functions (valid only if linear)
void vtkImplicitSum::EvaluateGradient(double x[3], double g[3])
{
double c;
int i;
double gtmp[3];
vtkImplicitFunction* f;
double* weights = this->Weights->GetPointer(0);
g[0] = g[1] = g[2] = 0.0;
vtkCollectionSimpleIterator sit;
for (i = 0, this->FunctionList->InitTraversal(sit);
(f = this->FunctionList->GetNextImplicitFunction(sit)); i++)
{
c = weights[i];
if (c != 0.0)
{
f->FunctionGradient(x, gtmp);
g[0] += gtmp[0] * c;
g[1] += gtmp[1] * c;
g[2] += gtmp[2] * c;
}
}
if (this->NormalizeByWeight && this->TotalWeight != 0.0)
{
g[0] /= this->TotalWeight;
g[1] /= this->TotalWeight;
g[2] /= this->TotalWeight;
}
}
//------------------------------------------------------------------------------
void vtkImplicitSum::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "NormalizeByWeight: " << (this->NormalizeByWeight ? "On\n" : "Off\n");
os << indent << "Function List:\n";
this->FunctionList->PrintSelf(os, indent.GetNextIndent());
os << indent << "Weights:\n";
this->Weights->PrintSelf(os, indent.GetNextIndent());
}
VTK_ABI_NAMESPACE_END
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