#  Copyright (c) 1997-2021
#  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.
#-------------------------------------------------------------------------------

# common base class for some file-based visualization back-ends

package Visual::Drawing;

use Polymake::Struct (
   [ new => ';$' ],
   [ '$title' => '#1' ],
   '@geometries',
   [ '$unnamed' => '0' ],
);

sub append {
   my $self = shift;
   push @{$self->geometries}, @_;
   foreach (@_) {
      if (length($_->name)) {
         $self->title //= $_->name;
      } else {
         $_->name="unnamed__" . ++$self->unnamed;
      }
   }
}

sub toString {
   my $self=shift;
   $self->header . join("", map { $_->toString } @{$self->geometries}) . $self->trailer;
}

1

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