NAME

Tk::GraphItems - Display relation-graphs on a Tk::Canvas

DESCRIPTION

Tk::GraphItems provides objects TextBox, Circle and Connector to display nodes and edges of given relation-graph models on a Tk::Canvas widget. Tk::GraphItems contain a dependency mechanism to ensure, that edges are updated on changes of position or size of their source- and target-nodes. Edges have view-properties like colour, width, direction(arrows). Nodes support (bg)colour and text (can be multiline). Nodes can be moved and placed programmatically or with drag/drop. To make integration into existing graph-implementations easier, Tk::GraphItems contains a simple tie-module to tie the nodes coords- getter-/setter - methods to given Variables in the underlying model. Bindings to Tk-Events can be set so it's easy to implement e.g. context-menus for the objects.

METHODS

Tk::GraphItems supports the following methods:

TextBox( canvas=>$can, text=>``new_node'', x =>50, y =>50 ): Create a new Tk::GraphItems::TextBox instance and display it on the Canvas.
Circle( canvas => $can, colour => $a_TkColor, size => $size_pixels, x => 50, y => 50 ): Create a new Tk::GraphItems::Circle instance and display it on the Canvas.
Connector( source=> $source_node, target=> $target_node ): Create a new Tk::GraphItems::Connector instance.

AUTHOR

Christoph Lamprecht, ch.l.ngre@online.de

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.7 or, at your option, any later version of Perl 5 you may have available.

Tk::GraphItems - Display relation-graphs on a Tk::Canvas