Graph::Easy::Layout::Path(3)

NAME
Graph::Easy::Layout::Path - Path management for Manhattan-style grids

SYNOPSIS
        use Graph::Easy;

        my $graph = Graph::Easy->new();

        my $bonn = Graph::Easy::Node->new(
                name => 'Bonn',
        );
        my $berlin = Graph::Easy::Node->new(
                name => 'Berlin',
        );

        $graph->add_edge ($bonn, $berlin);

        $graph->layout();

        print $graph->as_ascii( );

        # prints:

        # +------+     +--------+
        # | Bonn | --> | Berlin |
        # +------+     +--------+

DESCRIPTION
"Graph::Easy::Layout::Scout" contains just the actual path-managing code for Graph::Easy, e.g. to create/destroy/maintain paths, node placement etc.

EXPORT
Exports nothing.

SEE ALSO
Graph::Easy.

METHODS into Graph::Easy
This module injects the following methods into "Graph::Easy":

  _path_is_clear()
        $graph->_path_is_clear($path);

For all points (x,y pairs) in the path, check that the cell is still free. $path points to a list x,y,type pairs as in "[ [x,y,type], [x,y,type], ...]".

  _create_cell()
        my $cell = $graph->($edge,$x,$y,$type);

Create a cell at "$x,$y" coordinates with type $type for the specified edge.

  _path_is_clear()
        $graph->_path_is_clear();

For all points (x,y pairs) in the path, check that the cell is still free. $path points to a list of "[ x,y,type, x,y,type, ...]".

Returns true when the path is clear, false otherwise.

  _trace_path()
        my $path = my $graph->_trace_path($src,$dst,$edge);

Find a free way from source node/group to destination node/group for the specified edge. Both source and destination need to be placed beforehand.

METHODS in Graph::Easy::Node
This module injects the following methods into "Graph::Easy::Node":

  _near_places()
        my $node->_near_places();

Take a node and return a list of possible placements around it and prune out already occupied cells. $d is the distance from the node border and defaults to two (for placements). Set it to one for adjacent cells.

  _shuffle_dir()
        my $dirs = $node->_shuffle_dir( [ 0,1,2,3 ], $dir);

Take a ref to an array with four entries and shuffle them around according to $dir.

  _shift()
        my $dir = $node->_shift($degrees);

Return a the flow() direction shifted by X degrees to $dir.

AUTHOR
Copyright (C) 2004 - 2007 by Tels <http://bloodgate.com>.

See the LICENSE file for information.