context-free-art: Generate art from context-free grammars

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Create art via context free grammar production rules. Includes an SVG backend.

Context free grammar primer

Context free grammars consist of a set of terminal symbols, a set of non-terminal symbols, and production rules that map non-terminals to other symbols.

With a context-free grammar, we can generate strings of terminals that conform to the specified language.

Our language will describe graphics.


import Art.ContextFree
import Data.List.NonEmpty

-- let's define a Production rule
a = Circle 1

-- this will produce an IO Svg from the blaze-svg package
-- to turn it into a string we can use one of the `blaze-svg` renderers
graphic1 = interpret $ Circle 1

-- let's create a non-terminal, at every layer,
-- this will have an 85% chance of rendering another circle
circles = NonTerminal $ (85, [Move (2, 0)], Circle 1 :| [circles]) :| []


Change log
Dependencies base (>= && <4.13), bifunctors (>=5.5 && <5.6), blaze-markup, blaze-svg (>=0.3.6 && <0.4), extra (>=1.6 && <1.7), HUnit (>=1.6 && <1.7), random (>=1.1 && <1.2), text (>=1.2 && <1.3), text-show (>=3.8 && <3.9) [details]
License BSD-3-Clause
Author Owen Shepherd
Category Graphics
Home page
Uploaded by 414owen at 2019-10-16T23:55:12Z


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