branches/2d/examples/basic/single_cell_2d.cc

   1 #include "voro++_2d.hh"
   2 using namespace voro;
   3
   4 // This function returns a random floating point number between 0 and 1
   5 double rnd() {return double(rand())/RAND_MAX;}
   6
   7 int main() {
   8         double x,y,rsq,r;
   9         voronoicell_2d v;
  10
  11         // Initialize the Voronoi cell to be a cube of side length 2, centered
  12         // on the origin
  13         v.init(-1,1,-1,1);
  14
  15         // Cut the cell by 100 random planes which are all a distance 1 away
  16         // from the origin, to make an approximation to a sphere
  17         for(int i=0;i<100;i++) {
  18                 x=2*rnd()-1;
  19                 y=2*rnd()-1;
  20                 rsq=x*x+y*y;
  21                 if(rsq>0.01&&rsq<1) {
  22                         r=1/sqrt(rsq);x*=r;y*=r;
  23                         v.plane(x,y,1);
  24                 }
  25         }
  26
  27         // Print out several statistics about the computed cell
  28         v.centroid(x,y);
  29         printf("Perimeter is %g\n"
  30                "Area is %g\n"
  31                "Centroid is (%g,%g)\n",v.perimeter(),v.area(),x,y);
  32
  33         // Output the Voronoi cell to a file, in the gnuplot format
  34         v.draw_gnuplot(0,0,"single_cell_2d.gnu");
  35 }