src/halo-finder/src/ForceTree.cxx

/*=========================================================================
                                                                                
Copyright (c) 2007, Los Alamos National Security, LLC

All rights reserved.

Copyright 2007. Los Alamos National Security, LLC. 
This software was produced under U.S. Government contract DE-AC52-06NA25396 
for Los Alamos National Laboratory (LANL), which is operated by 
Los Alamos National Security, LLC for the U.S. Department of Energy. 
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
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=========================================================================*/

#include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <set>
#include <math.h>

#include "Partition.h"
#include "ForceTree.h"

#ifndef USE_VTK_COSMO
#include "Timings.h"
#endif

using namespace std;

/////////////////////////////////////////////////////////////////////////
//
// ForceTree calculates particle force using a BHTree
//
/////////////////////////////////////////////////////////////////////////

ForceTree::ForceTree()
{
  // Get the number of processors and rank of this processor
  this->numProc = Partition::getNumProc();
  this->myProc = Partition::getMyProc();

  this->bhTree = 0;
}

ForceTree::~ForceTree()
{
  if (this->bhTree != 0) delete this->bhTree;
}

/////////////////////////////////////////////////////////////////////////
//
// Set the parameters for algorithms
//
/////////////////////////////////////////////////////////////////////////

void ForceTree::setParameters(
                        POSVEL_T* minPos,
			POSVEL_T* maxPos,
			POSVEL_T openAngle,
			POSVEL_T critRadius,
			int minGroup,
			int maxGroup,
			POSVEL_T pmass)
{
  for (int dim = 0; dim < DIMENSION; dim++) {
    this->minLoc[dim] = minPos[dim];
    this->maxLoc[dim] = maxPos[dim];
  }
  this->openingAngle = openAngle;
  this->criticalRadius = critRadius;
  this->minimumGroup = minGroup;
  this->maximumGroup = maxGroup;
  this->particleMass = pmass;
}

/////////////////////////////////////////////////////////////////////////
//
// Set the particle vectors that have already been read and which
// contain only the alive particles for this processor
//
/////////////////////////////////////////////////////////////////////////

void ForceTree::setParticles(
                        vector<POSVEL_T>* xLoc,
                        vector<POSVEL_T>* yLoc,
                        vector<POSVEL_T>* zLoc,
                        vector<POSVEL_T>* xVel,
                        vector<POSVEL_T>* yVel,
                        vector<POSVEL_T>* zVel,
                        vector<POSVEL_T>* pmass,
                        vector<POTENTIAL_T>* potential)
{
  // Extract the contiguous data block from a vector pointer
  this->particleCount = (long) xLoc->size();
  this->xx = &(*xLoc)[0];
  this->yy = &(*yLoc)[0];
  this->zz = &(*zLoc)[0];
  this->vx = &(*xVel)[0];
  this->vy = &(*yVel)[0];
  this->vz = &(*zVel)[0];
  this->mass = &(*pmass)[0];
  this->pot = &(*potential)[0];
}

/////////////////////////////////////////////////////////////////////////
//
/////////////////////////////////////////////////////////////////////////

void ForceTree::buildForceTree()
{
  // BHTree is constructed from halo particles
  this->bhTree = new BHForceTree(
                            minLoc, maxLoc,
                            this->particleCount,
                            this->xx, this->yy, this->zz,
                            this->vx, this->vy, this->vz,
                            this->mass, this->particleMass);
}

/////////////////////////////////////////////////////////////////////////
//
/////////////////////////////////////////////////////////////////////////

void ForceTree::forceCalculationBarnesAdjust()
{
  this->bhTree->treeForceBarnesAdjust(this->openingAngle,
                                      this->criticalRadius);
}

void ForceTree::forceCalculationBarnesQuick()
{
  this->bhTree->treeForceBarnesQuick(this->openingAngle,
                                     this->criticalRadius);
}

void ForceTree::forceCalculationGadgetTopDown()
{
  for (int p = 0; p < this->particleCount; p++) {
    this->bhTree->treeForceGadgetTopDown(p, this->openingAngle, 
                                         this->criticalRadius);
  }
}

void ForceTree::forceCalculationGadgetBottomUp()
{
  for (int p = 0; p < this->particleCount; p++) {
    this->bhTree->treeForceGadgetBottomUp(p, this->openingAngle, 
                                          this->criticalRadius);
  }
}

void ForceTree::forceCalculationGroup()
{
  this->bhTree->treeForceGroup(this->openingAngle, 
                               this->criticalRadius,
                               this->minimumGroup,
                               this->maximumGroup);
}

void ForceTree::forceCalculationN2()
{
  this->bhTree->treeForceN2(this->criticalRadius);
}