trunk/examples/no_release/neigh_test.cc

   1 // Voronoi calculation example code
   2 //
   3 // Author   : Chris H. Rycroft (LBL / UC Berkeley)
   4 // Email    : chr@alum.mit.edu
   5 // Date     : April 14th 2013
   6
   7 #include "voro++.hh"
   8 using namespace voro;
   9
  10 // Set up constants for the container geometry
  11 const double x_min=-1,x_max=1;
  12 const double y_min=-1,y_max=1;
  13 const double z_min=-1,z_max=1;
  14 const double cvol=(x_max-x_min)*(y_max-y_min)*(x_max-x_min);
  15
  16 // Set up the number of blocks that the container is divided into
  17 const int n_x=6,n_y=6,n_z=6;
  18
  19 // Set the number of particles that are going to be randomly introduced
  20 const int particles=40;
  21
  22 // This function returns a random double between 0 and 1
  23 double rnd() {return double(rand())/RAND_MAX;}
  24
  25 int main() {
  26         int i;
  27         double x,y,z;
  28         voronoicell_neighbor c;
  29         std::vector<int> neigh;
  30
  31         // Create a container with the geometry given above, and make it
  32         // non-periodic in each of the three coordinates. Allocate space for
  33         // eight particles within each computational block
  34         container con(x_min,x_max,y_min,y_max,z_min,z_max,n_x,n_y,n_z,
  35                         true,true,true,8);
  36
  37         // Randomly add particles into the container
  38         for(i=0;i<particles;i++) {
  39                 x=x_min+rnd()*(x_max-x_min);
  40                 y=y_min+rnd()*(y_max-y_min);
  41                 z=z_min+rnd()*(z_max-z_min);
  42                 con.put(i,x,y,z);
  43         }
  44
  45         // Output the particle positions in gnuplot format
  46         con.draw_particles("random_points_p.gnu");
  47
  48         // Output the Voronoi cells in gnuplot format
  49         con.draw_cells_gnuplot("random_points_v.gnu");
  50
  51         // Loop over all of the particles and compute their Voronoi cells
  52         c_loop_all cl(con);
  53         if(cl.start()) do if(con.compute_cell(c,cl)) {
  54                 cl.pos(x,y,z);i=cl.pid();
  55                 c.neighbors(neigh);
  56
  57                 // Print out the information about neighbors
  58                 printf("Particle %2d at (% 1.3f,% 1.3f,% 1.3f):",i,x,y,z);
  59                 for(unsigned int j=0;j<neigh.size();j++) printf(" %d",neigh[j]);
  60                 puts("");
  61         } while (cl.inc());
  62 }