#  Copyright (c) 1997-2006
#  Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
#  http://www.math.tu-berlin.de/polymake,  mailto:polymake@math.tu-berlin.de
#
#  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.
#-----------------------------------------------------------------------------
#  $Project: polymake $$Id: metapost.rules 7514 2006-12-15 17:58:53Z gawrilow $

require MetapostGraph;

# Category: Visualization
# Produce a MetaPost input file with the given drawing
label metapost

package Metapost::File::Writer;
import Visual::FileWriter(suffix => ".mp", multiple => 1);

using namespaces 'Visual::Utilities';

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 Metapost::Viewer;

sub new {
   croak( "There is no interactive viewer for Metapost files;\n",
	  "please call metapost(..., File => \"filename\")" );
}

package default;

# Category: Visualization
# Produce a MetaPost input file with given visual objects.
# args: VisualObject, ...
# option: File => "filename" | "AUTO"
#         The MetaPost description has always 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 perl @c 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 @c .mp suffix if needed.
#
#         The default setting @a AUTO lets the file name be derived from the drawing title.
#         The automatically generated file name is displayed in the verbose mode.

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


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