File Coverage

blib/lib/Graph/Writer/VCG.pm

Criterion	Covered	Total	%
statement	49	58	84.4
branch	3	6	50.0
condition	0	6	0.0
subroutine	9	9	100.0
pod			n/a
total	61	79	77.2

#
# Graph::Writer::VCG - write a directed graph out in VCG format
#
package Graph::Writer::VCG;

use strict;
use warnings;

use parent 'Graph::Writer';
our $VERSION = '2.07';

#-----------------------------------------------------------------------
# Attribute type information
#-----------------------------------------------------------------------
use constant VCG_ATTR_TYPE_INTEGER	=> 1;
use constant VCG_ATTR_TYPE_STRING	=> 2;
use constant VCG_ATTR_TYPE_FLOAT	=> 3;

my $enum_color = [qw(aquamarine black blue cyan darkblue darkcyan darkgreen
		darkgrey darkmagenta darkred darkyellow gold green khaki
		lightblue lightcyan lightgreen lightgrey lightmagenta
		lightred lightyellow lilac magenta orange orchid pink
		purple red turquoise white yellow yellowgreen)];
my $enum_yes_no = [qw(yes no)];
my $enum_textmode = [qw(center left_justify right_justify)];
my $enum_shape	= [qw(box rhomb ellipse triangle)];
my $enum_arrowstyle = [qw(none line solid)];

my %common_attrs =
(
    label => VCG_ATTR_TYPE_STRING,
    color => $enum_color,
    textcolor => $enum_color,
);


#-----------------------------------------------------------------------
# List of valid dot attributes for the entire graph, per node,
# and per edge. You can set other attributes, but they won't get
# written out.
#-----------------------------------------------------------------------
my %valid_attributes =
(
    graph => {

	    %common_attrs,

	    title		=> VCG_ATTR_TYPE_STRING,
	    info1		=> VCG_ATTR_TYPE_STRING,
	    info2		=> VCG_ATTR_TYPE_STRING,
	    info3		=> VCG_ATTR_TYPE_STRING,
	    bordercolor		=> $enum_color,
	    width		=> VCG_ATTR_TYPE_INTEGER,
	    height		=> VCG_ATTR_TYPE_INTEGER,
	    borderwidth		=> VCG_ATTR_TYPE_INTEGER,
	    x			=> VCG_ATTR_TYPE_INTEGER,
	    y			=> VCG_ATTR_TYPE_INTEGER,
	    # loc
	    folding		=> VCG_ATTR_TYPE_INTEGER,
	    scaling		=> VCG_ATTR_TYPE_FLOAT,
	    shrink		=> VCG_ATTR_TYPE_INTEGER,
	    stretch		=> VCG_ATTR_TYPE_INTEGER,
	    textmode		=> $enum_textmode,
	    shape		=> $enum_shape,
	    level		=> VCG_ATTR_TYPE_INTEGER,
	    vertical_order	=> VCG_ATTR_TYPE_INTEGER,
	    horizontal_order	=> VCG_ATTR_TYPE_INTEGER,
	    status		=> [qw(black grey white)],
	    xmax		=> VCG_ATTR_TYPE_INTEGER,
	    ymax		=> VCG_ATTR_TYPE_INTEGER,
	    xbase		=> VCG_ATTR_TYPE_INTEGER,
	    ybase		=> VCG_ATTR_TYPE_INTEGER,
	    xspace		=> VCG_ATTR_TYPE_INTEGER,
	    xlspace		=> VCG_ATTR_TYPE_INTEGER,
	    yspace		=> VCG_ATTR_TYPE_INTEGER,
	    xraster		=> VCG_ATTR_TYPE_INTEGER,
	    xlraster		=> VCG_ATTR_TYPE_INTEGER,
	    invisble		=> VCG_ATTR_TYPE_INTEGER,
	    hidden		=> VCG_ATTR_TYPE_INTEGER,
		# classname
		# colorentry
		# infoname
	    layoutalgorithm	=> [qw(tree maxdepth mindepth maxdepthslow
					mindepthslow maxdegree mindegree
					maxindegree minindegree maxoutdegree
					minoutdegree minbackward dfs)],
	    layout_downfactor	=> VCG_ATTR_TYPE_INTEGER,
	    layout_upfactor	=> VCG_ATTR_TYPE_INTEGER,
	    layout_nearfactor	=> VCG_ATTR_TYPE_INTEGER,
	    splinefactor	=> VCG_ATTR_TYPE_INTEGER,
	    late_edge_labels	=> $enum_yes_no,
	    display_edge_labels	=> $enum_yes_no,
	    dirty_edge_labels	=> $enum_yes_no,
	    finetuning		=> $enum_yes_no,
	    ignoresingles	=> $enum_yes_no,
	    straight_phase	=> $enum_yes_no,
	    priority_phase	=> $enum_yes_no,
	    manhattan_edges	=> $enum_yes_no,
	    smanhattan_edges	=> $enum_yes_no,
	    nearedges		=> $enum_yes_no,
	    orientation		=> [qw(top_to_bottom bottom_to_top
					left_to_right right_to_left)],
	    node_alignment	=> [qw(bottom top center)],
	    port_sharing	=> $enum_yes_no,
	    arrowmode		=> [qw(fixed free)],
	    spreadlevel		=> VCG_ATTR_TYPE_INTEGER,
	    treefactor		=> VCG_ATTR_TYPE_FLOAT,
	    crossingphase2	=> $enum_yes_no,
	    crossingoptimization=> $enum_yes_no,
	    crossingweight	=> [qw(bary median barymedian medianbary)],
	    view		=> [qw(cfish fcfish pfish fpfish)],
	    edges		=> $enum_yes_no,
	    nodes		=> $enum_yes_no,
	    splines		=> $enum_yes_no,
	    bmax		=> VCG_ATTR_TYPE_INTEGER,
	    cmax		=> VCG_ATTR_TYPE_INTEGER,
	    cmin		=> VCG_ATTR_TYPE_INTEGER,
	    pmax		=> VCG_ATTR_TYPE_INTEGER,
	    pmin		=> VCG_ATTR_TYPE_INTEGER,
	    rmax		=> VCG_ATTR_TYPE_INTEGER,
	    rmin		=> VCG_ATTR_TYPE_INTEGER,
	    smax		=> VCG_ATTR_TYPE_INTEGER,

		},
    node  => {

	    %common_attrs,

	    info1		=> VCG_ATTR_TYPE_STRING,
	    info2		=> VCG_ATTR_TYPE_STRING,
	    info3		=> VCG_ATTR_TYPE_STRING,
	    bordercolor		=> $enum_color,
	    width		=> VCG_ATTR_TYPE_INTEGER,
	    height		=> VCG_ATTR_TYPE_INTEGER,
	    borderwidth		=> VCG_ATTR_TYPE_INTEGER,
	    # loc
	    folding		=> VCG_ATTR_TYPE_INTEGER,
	    scaling		=> VCG_ATTR_TYPE_FLOAT,
	    shrink		=> VCG_ATTR_TYPE_INTEGER,
	    stretch		=> VCG_ATTR_TYPE_INTEGER,
	    textmode		=> $enum_textmode,
	    shape		=> $enum_shape,
	    level		=> VCG_ATTR_TYPE_INTEGER,
	    vertical_order	=> VCG_ATTR_TYPE_INTEGER,
	    horizontal_order	=> VCG_ATTR_TYPE_INTEGER,

	     },
    edge  => {

	    %common_attrs,

	    thickness		=> VCG_ATTR_TYPE_INTEGER,
	    class		=> VCG_ATTR_TYPE_INTEGER,
	    priority		=> VCG_ATTR_TYPE_INTEGER,
	    arrowcolor		=> $enum_color,
	    backarrowcolor	=> $enum_color,
	    arrowsize		=> VCG_ATTR_TYPE_INTEGER,
	    backarrowsize	=> VCG_ATTR_TYPE_INTEGER,
	    arrowstyle		=> $enum_arrowstyle,
	    backarrowstyle	=> $enum_arrowstyle,
	    linestyle		=> [qw(continuous solid dotted
					dashed invisible)],
	    anchor		=> VCG_ATTR_TYPE_INTEGER,
	    horizontal_order	=> VCG_ATTR_TYPE_INTEGER,

	     },
);

#=======================================================================
#
# _write_graph()
#
# The private method which actually does the writing out in
# VCG format.
#
# This is called from the public method, write_graph(), which is
# found in Graph::Writer.
#
#=======================================================================
sub _write_graph
{
    my $self  = shift;
    my $graph = shift;
    my $FILE  = shift;

    my $v;
    my $from;
    my $to;
    my $aref;
    my @keys;


    #-------------------------------------------------------------------
    #-------------------------------------------------------------------
    print $FILE "graph: {\n";

    #-------------------------------------------------------------------
    # Dump out any overall attributes of the graph
    #-------------------------------------------------------------------
    $aref = $graph->get_graph_attributes();
    _render_attributes('graph', $aref, $FILE);

    #-------------------------------------------------------------------
    # Dump out a list of the nodes, along with any defined attributes
    #-------------------------------------------------------------------
    foreach $v (sort $graph->vertices)
    {
        print $FILE "  node: { title: \"$v\"";
        $aref = $graph->get_vertex_attributes($v);
        _render_attributes('node', $aref, $FILE, 1);
        print $FILE "  }\n";
    }
    print $FILE "\n";

    #-------------------------------------------------------------------
    # Dump out a list of the edges, along with any defined attributes
    #-------------------------------------------------------------------
    foreach my $edge (sort _by_vertex $graph->edges)
    {
        ($from, $to) = @$edge;
        print $FILE "  edge: { sourcename: \"$from\" targetname: \"$to\"";
        $aref = $graph->get_edge_attributes($from, $to);
        _render_attributes('edge', $aref, $FILE, 1);
        print $FILE "  }\n";
    }

    print $FILE "}\n";

    return 1;
}


sub _by_vertex
{
    return $a->[0].$a->[1] cmp $b->[0].$b->[1];
}


#=======================================================================
#
# _render_attributes
#
# Take a hash of attribute names and values and format
# as VCG attribute specs, quoting the value if needed.
# We filter the hash against legal attributes, since VCG will
# barf on unknown attribute names.
#
# Returns the number of attributes written out.
#
#=======================================================================
sub _render_attributes
{
    my $entity = shift;		# 'graph' or 'node' or 'edge'
    my $attref = shift;
    my $FILE   = shift;
    my $depth  = @_ > 0 ? shift : 0;

    my @keys;
    my $type;


    @keys = grep(exists $attref->{$_}, keys %{$valid_attributes{$entity}});
    if (@keys > 0)
    {
        print $FILE "\n";
        foreach my $a (@keys)
        {
            $type = $valid_attributes{$entity}->{$a};
            if (ref $type || $type == VCG_ATTR_TYPE_INTEGER
            || $type == VCG_ATTR_TYPE_FLOAT)
            {
                print $FILE "  ", '  ' x $depth, "$a: ", $attref->{$a}, "\n";
            }
            else
            {
                print $FILE "  ", '  ' x $depth,
                            "$a: \"", $attref->{$a}, "\"\n";
            }
        }
    }
    return int @keys;
}

1;

__END__