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/*=========================================================================
Program: Visualization Toolkit
Module: vtkStreaklineFilter.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 "vtkStreaklineFilter.h"
#include "vtkObjectFactory.h"
#include "vtkSetGet.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkCell.h"
#include "vtkCellArray.h"
#include "vtkPointData.h"
#include "vtkIntArray.h"
#include "vtkSmartPointer.h"
#include "vtkNew.h"
#include "vtkFloatArray.h"
#include <vector>
#include <cassert>
#include <algorithm>
#define DEBUGSTREAKLINEFILTER 1
#ifdef DEBUGSTREAKLINEFILTER
#define Assert(a) assert(a)
#else
#define Assert(a)
#endif
class StreakParticle
{
public:
vtkIdType Id;
float Age;
StreakParticle(vtkIdType id, float age)
:Id(id),Age(age)
{
}
bool operator<(const StreakParticle& other) const
{
return this->Age > other.Age;
}
};
typedef std::vector<StreakParticle> Streak;
vtkObjectFactoryNewMacro(vtkStreaklineFilter)
void StreaklineFilterInternal::Initialize(vtkParticleTracerBase* filter)
{
this->Filter = filter;
this->Filter->ForceReinjectionEveryNSteps = 1;
this->Filter->IgnorePipelineTime = 1;
}
int StreaklineFilterInternal::OutputParticles(vtkPolyData* particles)
{
this->Filter->Output = particles;
return 1;
}
void StreaklineFilterInternal::Finalize()
{
vtkPoints* points = this->Filter->Output->GetPoints();
if(!points)
{
return;
}
vtkPointData* pd = this->Filter->Output->GetPointData();
Assert(pd);
vtkFloatArray* particleAge = vtkArrayDownCast<vtkFloatArray>(pd->GetArray("ParticleAge"));
Assert(particleAge);
vtkIntArray* seedIds = vtkArrayDownCast<vtkIntArray>(pd->GetArray("InjectedPointId"));
Assert(seedIds);
if(seedIds)
{
std::vector<Streak> streaks; //the streak lines in the current time step
for(vtkIdType i=0; i<points->GetNumberOfPoints(); i++)
{
int streakId = seedIds->GetValue(i);
for(int j=static_cast<int>(streaks.size()); j<=streakId; j++)
{
streaks.push_back(Streak());
}
Streak& streak = streaks[streakId];
float age = particleAge->GetValue(i);
streak.push_back(StreakParticle(i,age));
}
//sort streaks based on age
for(unsigned int i=0; i<streaks.size();i++)
{
Streak& streak(streaks[i]);
std::sort(streak.begin(),streak.end());
}
this->Filter->Output->SetLines(vtkSmartPointer<vtkCellArray>::New());
this->Filter->Output->SetVerts(0);
vtkCellArray* outLines = this->Filter->Output->GetLines();
Assert(outLines->GetNumberOfCells()==0);
Assert(outLines);
for(unsigned int i=0; i<streaks.size();i++)
{
const Streak& streak(streaks[i]);
vtkNew<vtkIdList> ids;
for(unsigned int j=0; j<streak.size();j++)
{
Assert(j==0 || streak[j].Age <= streak[j-1].Age);
if(j==0 || streak[j].Age < streak[j-1].Age)
{
ids->InsertNextId(streak[j].Id);
}
}
if(ids->GetNumberOfIds()>1)
{
outLines->InsertNextCell(ids.GetPointer());
}
}
}
}
vtkStreaklineFilter::vtkStreaklineFilter()
{
this->It.Initialize(this);
}
int vtkStreaklineFilter::OutputParticles(vtkPolyData* particles)
{
return this->It.OutputParticles(particles);
}
void vtkStreaklineFilter::Finalize()
{
return this->It.Finalize();
}
void vtkStreaklineFilter::PrintSelf(ostream& os, vtkIndent indent)
{
Superclass::PrintSelf(os,indent);
}
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