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off_lattice.cpp
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Wed, Aug 14, 18:19
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text/x-c++
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Fri, Aug 16, 18:19 (1 d, 23 h)
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19875278
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rDLMA Diffusion limited mixed aggregation
off_lattice.cpp
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#include <off_lattice.hh>
namespace simulation{
template <typename type>
off_lattice<type>::off_lattice(const int dim, type *box_lengths, std::vector<boundary_conditions<type>*> system_bc){
D = dim;
L = (type*)malloc(sizeof(type) * D);
halfL = (type*)malloc(sizeof(type) * D);
inv_deltax = (type*)malloc(sizeof(type)*D);
num_grid = (int*)malloc(sizeof(int)*D);
nx = (int*)malloc(sizeof(int) * D);
neighbour_x = (int*)malloc(sizeof(int) * D);
for (int axis = 0; axis < D; axis++){
L[axis] = box_lengths[axis];
halfL[axis] = 0.5 * L[axis];
}
for (int axis = 0; axis < D; axis++){
num_grid[axis] = (int)(L[axis]);
nx[axis] = (int)(L[axis]);
}
type delta_x[D];
for (int axis = 0; axis < D; axis++){
delta_x[axis] = L[axis]/(1. * nx[axis]);
inv_deltax[axis] = 1./delta_x[axis];
}
L_eff = (int*)malloc(sizeof(int) * D);
for (int axis = 0; axis < D; axis++)
L_eff[axis] = 1;
for (int axis = 0; axis < D; axis++)
{
for (int itr = axis+1; itr < D; itr++)
L_eff[axis] *= nx[itr];
}
int L_total = 1;
for (int axis = 0; axis < D; axis++)
L_total *= nx[axis];
grid.resize(L_total);
for (int axis = 0; axis < D; axis++)
box_bc.push_back(system_bc[axis]);
periodic = (int*)malloc(sizeof(int) * D);
for (int axis = 0; axis < D; axis++)
periodic[axis] = 1;
}
template <typename type>
off_lattice<type>::~off_lattice()
{
free(L_eff);
}
template <typename type>
type off_lattice<type>::get_L(const int axis)
{ return L[axis]; }
template <typename type>
type off_lattice<type>::get_refill(type x, int axis){
return (box_bc[axis]->refill(x, L[axis]));
}
template <typename type>
void off_lattice<type>::add_particle_to_cell(const int id, type *pos){
counter = 0;
for (int axis = 0; axis < D; axis++)
nx[axis] = (int)(pos[axis]*inv_deltax[axis]);
for (int axis = 0; axis < D; axis++)
counter += (nx[axis]*L_eff[axis]);
grid[counter].push_back(id);
}
template <typename type>
void off_lattice<type>::remove_particle_from_cell(const int id, type *pos){
counter = 0;
for (int axis = 0; axis < D; axis++)
nx[axis] = (int)(pos[axis]*inv_deltax[axis]);
for (int axis = 0; axis < D; axis++)
counter += (nx[axis]*L_eff[axis]);
for (int i = 0; i < grid[counter].size(); i++){
if (grid[counter][i] == id)
grid[counter].erase(grid[counter].begin()+i);
}
}
template <typename type>
std::vector<int> off_lattice<type>::get_neighbour_list(type *pos){
neighbours.clear();
for (int axis = 0; axis < D; axis++)
nx[axis] = (int)(pos[axis]*inv_deltax[axis]);
switch (D){
case 2:
for (int i = -1; i <= 1; i++){
for (int j = -1; j <=1; j++){
neighbour_x[0] = (nx[0] + i);
neighbour_x[1] = (nx[1] + j);
neighbour_x[0] += periodic[0] * (num_grid[0] * (neighbour_x[0] == -1) - num_grid[0] * (neighbour_x[0] == num_grid[0]));
neighbour_x[1] += periodic[1] * (num_grid[1] * (neighbour_x[1] == -1) - num_grid[1] * (neighbour_x[1] == num_grid[1]));
counter = 0;
for (int axis = 0; axis < D; axis++)
counter += (neighbour_x[axis]*L_eff[axis]);
for (int n = 0; n < grid[counter].size(); n++)
neighbours.push_back(grid[counter][n]);
}
}
break;
case 3:
for (int i = -1; i <= 1; i++){
for (int j = -1; j <=1; j++){
for (int k = -1; k <= 1; k++) {
neighbour_x[0] = (nx[0] + i);
neighbour_x[1] = (nx[1] + j);
neighbour_x[2] = (nx[2] + k);
neighbour_x[0] += periodic[0] * (num_grid[0] * (neighbour_x[0] == -1) - num_grid[0] * (neighbour_x[0] == num_grid[0]));
neighbour_x[1] += periodic[1] * (num_grid[1] * (neighbour_x[1] == -1) - num_grid[1] * (neighbour_x[1] == num_grid[1]));
neighbour_x[2] += periodic[2] * (num_grid[2] * (neighbour_x[2] == -1) - num_grid[2] * (neighbour_x[2] == num_grid[2]));
counter = 0;
for (int axis = 0; axis < D; axis++)
counter += (neighbour_x[axis]*L_eff[axis]);
for (int n = 0; n < grid[counter].size(); n++)
neighbours.push_back(grid[counter][n]);
}
}
}
break;
}
return neighbours;
}
template <typename type>
int off_lattice<type>::get_periodicity(const int axis)
{return periodic[axis];}
template <typename type>
type off_lattice<type>::get_periodic_distance(type x, type y, int axis)
{
r = x - y;
r = r + periodic[axis] * (L[axis]*(r < -halfL[axis]) - L[axis]*(r > halfL[axis]));
return r;
}
template class off_lattice<int>;
template class off_lattice<double>;
}
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