/* Copyright (c) 1997-2024
   Ewgenij Gawrilow, Michael Joswig, and the polymake team
   Technische Universität Berlin, Germany
   https://polymake.org

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version: http://www.gnu.org/licenses/gpl.txt.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
--------------------------------------------------------------------------------
*/

#include "polymake/client.h"
#include "polymake/SparseMatrix.h"
#include "polymake/SparseVector.h"
#include "polymake/Array.h"
#include "polymake/Set.h"
#include "polymake/Rational.h"

namespace polymake { namespace topaz {
  
BigObject ball(const Int d)
{
   BigObject p("GeometricSimplicialComplex<Rational>");
   p.set_description() << "The " << d << "-dimensional ball.\n"
                          "Realized as the " << d << "-simplex.\n";

   Array<Set<Int>> F(1);
   F[0] = range(0, d);

   p.take("FACETS") << F;
   p.take("DIM") << d;
   p.take("PURE") << true;
   p.take("MANIFOLD") << true;
   p.take("BALL") << true;
   p.take("ORIENTED_PSEUDO_MANIFOLD") << true;
   if (d > 0)
      p.take("COORDINATES") << zero_vector<Rational>(d) / unit_matrix<Rational>(d);
   return p;
}
   
UserFunction4perl("# @category Producing from scratch\n"
                  "# A //d//-dimensional __ball__, realized as the //d//-simplex.\n"
                  "# @param Int d dimension"
                  "# @return GeometricSimplicialComplex"
                  "# @example The following produces the 3-ball and stores it in the variable $b:"
                  "# > $b = ball(3);"
                  "# You can print the facets of the resulting simplicial complex like so:"
                  "# > print $b->FACETS;"
                  "# | {0 1 2 3}",
                  &ball, "ball($)");
} }

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