NAME

Graph::Easy::Group - Represents a group of nodes in a simple graph

SYNOPSIS

        use Graph::Easy::Group;

        my $bonn = Graph::Easy::Node->new(
                name => 'Bonn',
                border => 'solid 1px black',
        );
        my $berlin = Graph::Easy::Node->new(
                name => 'Berlin',
        );
        my $cities = Graph::Easy::Group->new(
                name => 'Cities',
        );

        $cities->add_nodes ($bonn);
        # $bonn will be ONCE in the group
        $cities->add_nodes ($bonn, $berlin);

DESCRIPTION

A Graph::Easy::Node represents a node in a simple graph. Each node has contents (a text, an image or another graph), and dimension plus an origin. The origin is typically determined by a graph layouter module like Graph::Easy.

METHODS

new()

        my $group = Graph::Easy::Group->new( $options );

Create a new, empty group. $options are the possible options, see Graph::Easy::Node for a list.

error()

        $last_error = $group->error();

        $group->error($error);                  # set new messags
        $group->error('');                      # clear error

Returns the last error message, or '' for no error.

as_ascii()

        my $ascii = $group->as_ascii();

Return the group as a little box drawn in ASCII art as a string.

name()

        my $name = $group->name();

Return the name of the group.

contents()

        my $contents = $node->contents();

For nested nodes, returns the contents of the node.

width()

        my $width = $node->width();

Returns the width of the node. This is a unitless number.

height()

        my $height = $node->height();

Returns the height of the node. This is a unitless number.

pos()

        my ($x,$y) = $node->pos();

Returns the position of the node. Initially, this is undef, and will be set from Graph::Easy::layout.

x()

        my $x = $node->x();

Returns the X position of the node. Initially, this is undef, and will be set from Graph::Easy::layout.

y()

        my $y = $node->y();

Returns the Y position of the node. Initially, this is undef, and will be set from Graph::Easy::layout.

id()

        my $id = $node->id();

Returns the node's unique ID number.

predecessors()

        my @pre = $node->predecessors();

Returns all nodes (as objects) that link to us.

successors()

        my @suc = $node->successors();

Returns all nodes (as objects) that we are linking to.

EXPORT

None by default.

SEE ALSO

Graph::Easy.

AUTHOR

Copyright (C) 2004 - 2005 by Tels http://bloodgate.com

See the LICENSE file for more details.

cpanm Graph::Easy

perl -MCPAN -e shell
install Graph::Easy