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# Copyright (c) 1997-2015
# 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.
#-------------------------------------------------------------------------------
###############################################################################
#
# Common base for Visual::Wire and Visual::Graph
package Visual::WireBase;
use Polymake::Struct (
[ '@ISA' => 'PointSet' ],
[ '$EdgeColor' => 'unify_edge_decor(#%)', merge => 'unify_edge_decor(#%)', default => '$Visual::Color::edges' ],
[ '$EdgeThickness' => 'unify_edge_decor(#%)', merge => 'unify_edge_decor(#%)', default => 'undef' ],
[ '$EdgeLabels' => 'unify_edge_labels(#%)', default => '"hidden"' ],
[ '$EdgeStyle' => 'unify_edge_decor(#%)', merge => 'unify_edge_decor(#%)', default => 'undef' ],
);
# the same as Visual::unify_decor, but with extra dereferencing
# in the cases of array and hash access.
sub unify_edge_decor {
my ($name, $decor, $default)=@_;
my $unified;
if (is_container($decor)) {
$unified=&unify_decor;
sub { $unified->(${$_[0]}) }
} elsif (is_hash($decor)) {
if (is_code($default)) {
# assuming that $default was already filtered thru unify_edge_decor,
# we must avoid repeated dereferencing
$unified=unify_decor($name,$decor);
sub { $unified->(${$_[0]}) // &$default }
} else {
$unified=&unify_decor;
sub { $unified->(${$_[0]}) }
}
} else {
&unify_decor
}
}
sub unify_edge_labels {
my ($name, $labels)=@_;
if (is_code($labels)) {
$labels
} else {
$labels=&unify_labels
and sub { $labels->(${$_[0]}) }
}
}
sub ArrowStyle { undef }
###############################################################################
package Visual::Wire::EdgeIterator;
use Polymake::Struct (
[ new => '$' ],
[ '@edges' => '#1' ],
[ '$index' => '0' ],
[ '$end' => '$#{ #1 }' ],
);
use overload
bool => sub { my $self=shift; $self->index <= $self->end },
'++' => sub { $_[0]->index++ },
'""' => sub { $_[0]->index },
'${}' => sub { \($_[0]->index) },
'@{}' => sub { my $self=shift; $self->edges->[$self->index] },
'=' => sub { bless [ @{(shift)} ] },
falback => 0;
package Visual::Wire;
use Polymake::Struct (
[ '@ISA' => 'WireBase' ],
[ '$Edges' => 'check_edges(#%)', default => 'croak("Edges missing")' ],
);
sub check_edges {
my ($name, $edges)=@_;
is_array($edges) ? $edges : croak( "$name is not an array" );
}
sub n_nodes { scalar(@{(shift)->Vertices}) }
sub n_edges { scalar(@{(shift)->Edges}) }
sub all_edges { new EdgeIterator((shift)->Edges) }
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# End:
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