GraphRewriting.GL.UI

This module provides an easy-to-use interface to create an interactive, graphical front-end for you graph rewriting system. The controls of the GUI are:

• left-click on a menu entry: rule selection. At all times for each redex (according to the selected rule) one node of the redex (the first node that is matched) is marked red in the graph.
• right-click on a menu entry: applies the rule once for each redex currently existing in the graph. No contractions take place for redexes deleted or arisen during this process.
• right-click on a (red) node: applies the selected rule to the redex containing the node.
• drag a node: by this you can manually help out the graph drawing mechanism to find a better layout.
• drag outside of a node: scroll around.
• mouse wheel: zoom
• z: autozoom
• space: pause/resume layouting

Please have a look the graph-rewriting-ski package for an example application that makes use of this library.

Documentation

initialise :: IO (String, [String])

Initialises GLUT. Returns program name and command line arguments.

run

Arguments

:: (View [Port] n, Render n, View Position n, PortSpec n, View Rotation n)

=> Int

The number of layout steps to apply before displaying the graph

-> (Graph n -> Graph n)

A projection function that is applied just before displaying the graph

-> (Node -> Rewrite n a)

The monadic graph transformation code for a layout step

-> Graph n

-> LabeledTree (Rule n)

The rule menu given as a tree of named rules

-> IO ()

After initialisation run can be used to start the GUI

data LabeledTree a

Constructors

Branch String [LabeledTree a]

Leaf String a