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Chaos game: Difference between revisions
→{{header|EasyLang}}: add Emacs Lisp
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Line 785:
y = (y + y[h]) / 2
.</lang>
=={{header|Emacs Lisp}}==
<lang lisp>; Chaos game
(defun make-array (size)
"Create an empty array with size*size elements."
(setq m-array (make-vector size nil))
(dotimes (i size)
(setf (aref m-array i) (make-vector size 0)))
m-array)
(defun chaos-next (p)
"Return the next coordinates."
(let* ((points (list (cons 1 0) (cons -1 0) (cons 0 (sqrt 3))))
(v (elt points (random 3)))
(x (car p))
(y (cdr p))
(x2 (car v))
(y2 (cdr v)))
(setq nx (/ (+ x x2) 2.0))
(setq ny (/ (+ y y2) 2.0))
(cons nx ny)))
(defun chaos-lines (arr size)
"Turn array into a string for XPM conversion."
(setq all "")
(dotimes (y size)
(setq line "")
(dotimes (x size)
(setq line (concat line (if (= (elt (elt arr y) x) 1) "*" "."))))
(setq all (concat all "\"" line "\",\n")))
all)
(defun chaos-show (arr size)
"Convert size*size array to XPM image and show it."
(insert-image (create-image (concat (format "/* XPM */
static char * chaos[] = {
\"%i %i 2 1\",
\". c #000000\",
\"* c #00ff00\"," size size)
(chaos-lines arr size) "};") 'xpm t)))
(defun chaos (size scale max-iter)
"Play the chaos game."
(let ((arr (make-array size))
(p (cons 0 0)))
(dotimes (it max-iter)
(setq p (chaos-next p))
(setq x (round (+ (/ size 2) (* scale (car p)))))
(setq y (round (+ (- size 10) (* -1 scale (cdr p)))))
(setf (elt (elt arr y) x) 1))
(chaos-show arr size)))
(chaos 400 180 50000) </lang>
=={{header|F Sharp|F#}}==
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