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/*=========================================================================
Program: Visualization Toolkit
Module: vtkBoxMuellerRandomSequence.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 "vtkBoxMuellerRandomSequence.h"
#include "vtkMath.h"
#include "vtkMinimalStandardRandomSequence.h"
#include "vtkObjectFactory.h"
#include <cassert>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkBoxMuellerRandomSequence);
//------------------------------------------------------------------------------
vtkBoxMuellerRandomSequence::vtkBoxMuellerRandomSequence()
{
this->UniformSequence = vtkMinimalStandardRandomSequence::New();
this->Value = 0;
}
//------------------------------------------------------------------------------
vtkBoxMuellerRandomSequence::~vtkBoxMuellerRandomSequence()
{
this->UniformSequence->Delete();
}
//------------------------------------------------------------------------------
double vtkBoxMuellerRandomSequence::GetValue()
{
return this->Value;
}
//------------------------------------------------------------------------------
void vtkBoxMuellerRandomSequence::Next()
{
this->UniformSequence->Next();
double x = this->UniformSequence->GetValue();
// Make sure x is in (0,1]
while (x == 0.0)
{
this->UniformSequence->Next();
x = this->UniformSequence->GetValue();
}
this->UniformSequence->Next();
double y = this->UniformSequence->GetValue();
// Make sure y is in (0,1]
while (y == 0.0)
{
this->UniformSequence->Next();
y = this->UniformSequence->GetValue();
}
this->Value = sqrt(-2.0 * log(x)) * cos(2.0 * vtkMath::Pi() * y);
}
//------------------------------------------------------------------------------
vtkRandomSequence* vtkBoxMuellerRandomSequence::GetUniformSequence()
{
assert("post: result_exists" && this->UniformSequence != nullptr);
return this->UniformSequence;
}
//------------------------------------------------------------------------------
// Description:
// Set the uniformly distributed sequence of random numbers.
// Default is a .
void vtkBoxMuellerRandomSequence::SetUniformSequence(vtkRandomSequence* uniformSequence)
{
assert("pre: uniformSequence_exists" && uniformSequence != nullptr);
if (this->UniformSequence != uniformSequence)
{
this->UniformSequence->Delete();
this->UniformSequence = uniformSequence;
this->UniformSequence->Register(this);
}
assert("post: assigned" && uniformSequence == this->GetUniformSequence());
}
//------------------------------------------------------------------------------
void vtkBoxMuellerRandomSequence::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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