cpFEM/lloyds.cpp at main · monsteryuer/cpFEM · GitHub

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#include"cpFEM.h"
#include"simu.h"
#include"data_kept.h"


// Lloyds algorithm
// Only one step
//
FT lloyds(Triangulation& T) {

  cout << "Lloyds algorithm ... " << endl ;

  //  copy_weights( T );

  // volumes( T );

  //  copy_weights( T );

  vector<data_kept> prev;

  FT dd2=0;

  for(F_v_it fv=T.finite_vertices_begin();
      fv!=T.finite_vertices_end();
      fv++) {

    int idx = fv->idx();

    data_kept data(fv);

    if(idx < 0 ) {

      data.pos = fv->point().point();
      prev.push_back (data);

      continue;

    }

    Point rnow = fv->point().point(); // current point

    Point rnew = fv->centroid.val();

    Vector_2 disp2 = rnew - rnow;

    FT rel_disp = sqrt(disp2.squared_length() ) / simu.h();

    //    cout << " rel disp of " << idx << "  :  " << rel_disp << endl ;

    dd2 += rel_disp;

    data.pos = rnew;

    data.Dr = disp2;

    prev.push_back(data);

  }

  dd2 /= simu.no_of_particles();

  cout << "Moved relative displacement: " <<
    sqrt(dd2)/simu.h()   ;


  cout << " . Mean displacement: " << dd2 << endl ;

  T.clear(); // clears the triangulation !!

  for(vector<data_kept>::iterator data=prev.begin();
      data!=prev.end();
      data++) {

      //    cout << "Inserting back at " << data->pos << endl ;

    Vertex_handle fv=T.insert(   wPoint( data->pos , data->w )  );

    data->restore(fv);

  }

  return dd2;
}