#  Copyright (c) 1997-2018
#  Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
#  http://www.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.
#-------------------------------------------------------------------------------

require MetapostGraph;

# @category Visualization
# Produce a MetaPost input file with the given drawing.
label metapost

package Metapost::File::Writer;
import Visual::FileWriter(multiple => 1);

sub file_suffix { ".mp" }

global_method metapost.geometry: draw(Visual::PointSet, @) {
   my ($self, $PointSet)=@_;
   $self->append(new Metapost::Element($PointSet));
}

global_method metapost.graph: draw(Visual::Graph, @) {
   my ($self, $Graph)=@_;
   $self->append(new Metapost::Graph($Graph));
}

global_method metapost.lattice: draw(Visual::Lattice) {
   my ($self, $Lattice)=@_;
   $self->append(new Metapost::Lattice($Lattice));
}

package application;

# @category Visualization
# Produce a MetaPost input file with given visual objects.
# @param Visual::Object vis_obj ... objects to display
#
# @option String File "filename" or "AUTO"
#  The MetaPost description always has to be stored in a file, there is no interactive viewer for this
#  kind of visualization.
#
#  For the file name you can use any expression allowed for the ''open'' function,
#  including "-" for terminal output, "&HANDLE" for an already opened file handle,
#  or "| program" for a pipe.  Real file names are automatically completed with the ''.mp'' suffix if needed.
#
#  The default setting "AUTO" lets the file name be derived from the drawing title.
#  The automatically generated file name is displayed in the verbose mode.
# @example [nocompare] The following prints a metapost description of the complete graph with 3 nodes in the console:
# > metapost(complete(3)->VISUAL,File=>"-");

user_function metapost(Visual::Object+, { File => "AUTO" }) {
   visualize_explicit(@_, "Metapost");
}


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