trunk/examples/no_release/tri_mesh.cc

   1 // Voronoi calculation example code
   2 //
   3 // Author   : Chris H. Rycroft (LBL / UC Berkeley)
   4 // Email    : chr@alum.mit.edu
   5 // Date     : August 30th 2011
   6
   7 #include "voro++.hh"
   8 using namespace voro;
   9
  10 #include <vector>
  11 using namespace std;
  12
  13 // Set up constants for the container geometry
  14 const double x_min=-1,x_max=1;
  15 const double y_min=-1,y_max=1;
  16 const double z_min=-1,z_max=1;
  17
  18 // Set up the number of blocks that the container is divided into
  19 const int n_x=6,n_y=6,n_z=6;
  20
  21 // Set the number of particles that are going to be randomly introduced
  22 const int particles=1;
  23
  24 // This function returns a random double between 0 and 1
  25 double rnd() {return double(rand())/RAND_MAX;}
  26
  27 int main() {
  28         int i,j,id,nv;
  29         double x,y,z;
  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                         false,false,false,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         // Sum up the volumes, and check that this matches the container volume
  46         c_loop_all cl(con);
  47         vector<int> f_vert;
  48         vector<double> v;
  49         voronoicell c;
  50         if(cl.start()) do if(con.compute_cell(c,cl)) {
  51                 cl.pos(x,y,z);id=cl.pid();
  52                 printf("Particle %d:\n",id);
  53
  54                 // Gather information about the computed Voronoi cell
  55                 c.face_vertices(f_vert);
  56                 c.vertices(x,y,z,v);
  57
  58                 // Print vertex positions
  59                 for(i=0;i<v.size();i+=3) printf("Vertex %d : (%g,%g,%g)\n",i/3,v[i],v[i+1],v[i+2]);
  60                 puts("");
  61
  62                 // Loop over all faces of the Voronoi cell
  63                 j=0;
  64                 while(j<f_vert.size()) {
  65
  66                         // Number of vertices in this face
  67                         nv=f_vert[j];
  68
  69                         // Print triangles
  70                         for(i=2;i<nv;i++)
  71                                 printf("Triangle : (%d,%d,%d)\n",f_vert[j+1],f_vert[j+i],f_vert[j+i+1]);
  72
  73                         // Move j to point at the next face
  74                         j+=nv+1;
  75                 }
  76                 puts("");
  77         } while (cl.inc());
  78
  79         // Output the particle positions in gnuplot format
  80         con.draw_particles("random_points_p.gnu");
  81
  82         // Output the Voronoi cells in gnuplot format
  83         con.draw_cells_gnuplot("random_points_v.gnu");
  84 }