branches/dynamic/examples/basic/single_cell.cc

   1 // Single Voronoi cell example code
   2 //
   3 // Author   : Chris H. Rycroft (LBL / UC Berkeley)
   4 // Email    : chr@alum.mit.edu
   5 // Date     : July 1st 2008
   6
   7 #include "voro++.cc"
   8
   9 // This function returns a random floating point number between 0 and 1
  10 double rnd() {return double(rand())/RAND_MAX;}
  11
  12 int main() {
  13         double x,y,z,rsq,r;
  14         voronoicell v;
  15
  16         // Initialize the Voronoi cell to be a cube of side length 2, centered
  17         // on the origin
  18         v.init(-1,1,-1,1,-1,1);
  19
  20         // Cut the cell by 250 random planes which are all a distance 1 away
  21         // from the origin, to make an approximation to a sphere
  22         for(int i=0;i<250;i++) {
  23                 x=2*rnd()-1;
  24                 y=2*rnd()-1;
  25                 z=2*rnd()-1;
  26                 rsq=x*x+y*y+z*z;
  27                 if(rsq>0.01&&rsq<1) {
  28                         r=1/sqrt(rsq);x*=r;y*=r;z*=r;
  29                         v.plane(x,y,z,1);
  30                 }
  31         }
  32
  33         // Output the Voronoi cell to a file, in the gnuplot format
  34         v.draw_gnuplot("single_cell.gnu",0,0,0);
  35 }