@hackage context-free-art0.2.0.0

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.

Example

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
a = Mod [Move (2, 0)] b
b = NonTerminal $ (85, c) :| []
c = NonTerminal $ (100, Circle 1) :| [(100, a)]