trunk/examples/no_release/single_cell_2d.cc

   1 // Single Voronoi cell 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 // This function returns a random floating point number between 0 and 1
  11 double rnd() {return double(rand())/RAND_MAX;}
  12
  13 int main() {
  14         double x,y,rsq,r;
  15         voronoicell v;
  16
  17         // Initialize the Voronoi cell to be a square of side length 2 in the xy-plane. Set the
  18         // cell to be 1 high in the z-direction.
  19         v.init(-1,1,-1,1,-0.5,0.5);
  20
  21         // Cut the cell by 250 random planes which are all a distance 1 away
  22         // from the origin, to make an approximation to a sphere
  23         for(int i=0;i<25;i++) {
  24                 x=2*rnd()-1;
  25                 y=2*rnd()-1;
  26                 rsq=x*x+y*y;
  27                 if(rsq>0.01&&rsq<1) {
  28                         r=1/sqrt(rsq);x*=r;y*=r;
  29                         v.plane(x,y,0,1);
  30                 }
  31         }
  32
  33         // Output the Voronoi cell to a file, in the gnuplot format
  34         v.draw_gnuplot(0,0,0,"single_cell_2d.gnu");
  35 }