this is uhhh, not quite an L-system

penrose-tile/.gitignore

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+/target
+/classes
+/checkouts
+pom.xml
+pom.xml.asc
+*.jar
+*.class
+/.lein-*
+/.nrepl-port

penrose-tile/LICENSE

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+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
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penrose-tile/README.md

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+# penrose-tile
+
+A Quil sketch designed to ... well, that part is up to you.
+
+## Usage
+
+LightTable - open `core.clj` and press `Ctrl+Shift+Enter` to evaluate the file.
+
+Emacs - run cider, open `core.clj` and press `C-c C-k` to evaluate the file.
+
+REPL - run `(require 'penrose-tile.core)`.
+
+## License
+
+Copyright © 2016 FIXME
+
+Distributed under the Eclipse Public License either version 1.0 or (at
+your option) any later version.

penrose-tile/project.clj

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+(defproject penrose-tile "0.1.0-SNAPSHOT"
+  :description "FIXME: write description"
+  :url "http://example.com/FIXME"
+  :license {:name "Eclipse Public License"
+            :url "http://www.eclipse.org/legal/epl-v10.html"}
+  :dependencies [[org.clojure/clojure "1.10.1"]
+                 [quil "3.1.0"]])

penrose-tile/src/penrose_tile/core.clj

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+(ns penrose-tile.core
+  (:require [quil.core :as q]
+            [quil.middleware :as m]))
+
+(def axiom "F")
+(def rule "F+F-F")
+(def start-length 190)
+(def theta (q/radians 120))
+(def production (atom (str axiom)))
+(def draw-length (atom start-length))
+(def generations (atom 0))
+(def steps (atom 0))
+
+
+(defn update-step
+  []
+  (if (> @steps (count @production)) 
+    (reset! steps (count @production))) 
+    (swap! steps (partial + 5)))
+
+(defn iter 
+  []
+  (swap! draw-length (partial * 0.6))
+  (swap! generations inc)
+  (swap! production #(clojure.string/replace % "F" rule)))
+
+(defn simulate
+  [gen]
+  (while (< @generations gen)
+    (iter)))
+
+(defn parse-string 
+  "Draw the entire LSystem by parsing production"
+  []
+  (update-step)
+  (q/translate (/ (q/width) 2) (/ (q/height) 2))
+  (doseq [step (vec @production)]
+    (cond 
+      (= step \F) ((q/rect 0 0 (- @draw-length) (- @draw-length))
+                    (q/translate 0 (- @draw-length)))
+      (= step \+) (q/rotate @theta)
+      (= step \-) (q/rotate (- @theta))
+      (= step \[) (q/push-matrix)
+      (= step \]) (q/pop-matrix))))
+
+
+(defn draw-state []
+  ; Set circle color.
+  (q/background 255)
+  (q/stroke 0)
+  (q/rect (/ (q/width) 2) (/ (q/height) 2) 50 50)
+  (parse-string)
+  )
+
+(defn setup []
+  (q/frame-rate 30)
+  (q/color-mode :hsb)
+  (simulate 6))
+
+(q/defsketch penrose-tile
+  :title "You spin my circle right round"
+  :size [500 500]
+  ; setup function called only once, during sketch initialization.
+  :setup setup
+  ; update-state is called on each iteration before draw-state.
+  :update identity
+  :draw draw-state
+  :features [:keep-on-top]
+  ; This sketch uses functional-mode middleware.
+  ; Check quil wiki for more info about middlewares and particularly
+  ; fun-mode.
+  ;:middleware [m/fun-mode])
+  )