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Cell.hpp
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Fri, Apr 4, 05:30

Cell.hpp
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/**
* @file Particle.hpp
* @author Munier Louis
* @date 30.05.19
* @version 1.0
*
* Cell file to implement a class named cell,
*/
#ifndef PHPC_NBODY_CELL_HPP
#define PHPC_NBODY_CELL_HPP
/**
* @include constants.hpp which contains all the needed project's constants/includes
* @include Vector.hpp custom library to have minimal vector implementation
* @include Tree.hpp custom class to have mother class link
*/
#include "constants.hpp"
#include "Vector.hpp"
#include "Tree.hpp"
/**
* @namespace std to simplify code implementation
*/
using namespace std;
/**
* Namespace of Tree to link classes.
*
* @namespace Tree
*/
namespace Tree {
/**
* Class cell to store all the information of a given Cell.
*
* @class Cell
* @tparam Type of the vector, 2D or 3D (and int, float, etc ...)
*/
template<typename Type>
class Cell : public AbstractType<Type> {
public:
/**
* Constructor to create a Cell. All the member variables have defaults zero values if needed.
*
* @param center center of the given cell
* @param dim dimensions of the given cell
* @param mass_pos center of mass of the given cell
*/
explicit Cell(Type center = Type(), Type dim = Type(), Type mass_pos = Type()) :
_center(center), _size(dim), _mass_pos(mass_pos) {}
/**
* Destructor to safely delete all pointer in the Cell element.
*/
~Cell() override {
this->_parent = nullptr;
delete this->_parent;
for (auto n : this->_next)
delete n;
this->_next.clear();
}
/**
* Return the type of the given class.
*
* @return enum value CellT
*/
my_type get_type() override { return CellT; }
/**
* Return the attribute vector array of pointer on the next particle/cells in the tree data-structure. Override
* by the child class.
*
* @return _next attribute vector array of pointer on the next particle/cells in the tree data-structure
*/
vector<AbstractType < Type>* > get_next() override { return this->_next; }
/**
* Return one of the following attribute of the given particle :
* - position
* - velocity
* - load
*
* @param p enum value of the attribute
* @return desired attribute of the given particle
*/
Type get(property p) override {
switch (p) {
case CENTER :
return this->_center;
case DIM :
return this->_size;
case MASS_POS :
return this->_mass_pos;
default:
break;
}
}
/**
* Set attribute value of one of the following properties for a given particle :
* - position
* - velocity
* - load
*
* @param p enum value of the attribute
* @param vec new vector value to set the attribute
*/
void set(property p, Type vec) override {
switch (p) {
case CENTER :
this->_center = vec;
break;
case DIM :
this->_size = vec;
break;
case MASS_POS :
this->_mass_pos = vec;
break;
default:
break;
}
}
/**
* Subdivide a node in 2^NB_DIM sub-cells and fill _next attribute vector array with a pointer to each sub-cell.
*/
void subdivide_tree() override {
bool y = true, z = false;
Type size = this->_size * 0.5;
/** Loop to have 2^NB_DIM sub-cells */
for (int n = 0; n < pow(2, NB_DIM); n++) {
/** Compute center of the cell */
if (n % 2 == 0)
y = !y;
if (n == 4)
z = !z;
#if NB_DIM == DIM_2
Type center = Type(size.x * (0.5 * pow(-1, (n + 1) % 2)), size.y * (0.5 * pow(-1, y)));
#elif NB_DIM == DIM_3
Type center = Type(size.x*(0.5*pow(-1, (n+1)%2)), size.y*(0.5*pow(-1, y)), size.z*(0.5*pow(-1, z)));
#endif
center = this->_center + center;
/** Fill _next vector array with each new sub-cell */
auto next = new Cell<Type>(center, size, center);
this->_next.push_back(next);
next->set_parent(this);
}
}
/**
* Store particle in the tree.
*
* @param particle pointer on current particle to store
* @param prev_part pointer on a particle to store after the current one
*/
void store_particle(AbstractType <Type> *particle, AbstractType <Type> *prev_part) override {
/** If there is no next element */
if (this->_next.empty()) {
this->_next.push_back(particle);
particle->set_parent(this);
particle->update_cell(true);
if (prev_part != nullptr) {
particle = prev_part;
prev_part = nullptr;
this->_parent->store_particle(particle, prev_part);
}
} /** If next element is a particle */
else if (this->_next[0]->get_type() == ParticleT) {
prev_part = this->_next[0];
/** clear precedent pointers */
this->_next.clear();
this->_m = 0.0f;
this->_mass_pos = Type();
prev_part->set_parent(nullptr);
this->subdivide_tree();
this->store_particle(particle, prev_part);
} /** If next element is a cell */
else {
int cell_idx_1 = particle->find_cell_idx(this->_center);
particle->set_parent(this);
particle->update_cell(true);
particle->set_parent(nullptr);
this->get_next()[cell_idx_1]->store_particle(particle, prev_part);
}
}
/**
* Compute the load vector between two particles to update the one passed in argument. The load is
* the General gravity one.
*
* @param particle where the load is applied
*/
void compute_load(AbstractType <Type> *particle) override {
Type tmp = this->_mass_pos - particle->get(POS);
float d = max(tmp.norm(), EPSILON);
particle->set(LOAD, particle->get(LOAD) + tmp * (G * this->_m) / d);
}
/**
* Delete a given level of cells
*/
void del_level() override {
while (!this->_next.empty()) {
auto next = this->_next.back();
next->set_parent(nullptr);
delete next->get_parent();
this->_next.pop_back();
delete next;
}
this->_next.clear();
}
/**
* Clear all elements in the attribute vector array of pointer on the next particle/cells in the tree
* data-structure. Override by the child class.
*/
void clear_next() override {
this->_next.clear();
}
private:
Type _center; /**< vector position of the center of the given cell */
Type _size; /**< vector size of the given cell */
Type _mass_pos; /**< vector position of the center of mass of the given cell */
vector<AbstractType < Type>*> _next{}; /**< vector list of the following cells or a particle */
};
}
#endif //PHPC_NBODY_CELL_HPP

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