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(defun for (from to func)
(cond ((< from to) (func from) (for (+ from 1) to func))))
(set 'mandelbrot-chars
(list " " "." "," "`" "'" "\"" ":" ";" "-" "+" "o" "O" "0" "1"
"2" "3" "4" "5" "6" "7" "8" "9" "%" "*" "&" "$" "@" "#"))
(defun mandelbrot-iter (x y x0 y0 i)
(fill ((! i 28) " ")
((not (> (+ (* x0 x0) (* y0 y0)) 4)) (nth i mandelbrot-chars))
(f (mandelbrot-iter x y
(+ (- (* x0 x0) (* y0 y0)) x) (+ (* 2 x0 y0) y)
(+ i 1)))))
(defun mandelbrot-char (x y)
(mandelbrot-iter x y
(+ (- (* x x) (* y y)) x) (+ (* 2 x y) y)
0))
(defun mandelbrot (xmin xmax ymin ymax)
(for 0 24 (lambda (py)
(for 0 80 (lambda (px)
(princ
(mandelbrot-char
(+ (* (/ px 80) (- xmax xmin)) xmin)
(+ (* (/ py 24) (- ymax ymin)) ymin)))))
(newline))))
(mandelbrot -2.15 1.25 -1.25 1.25)
; (mandelbrot -1.5 -1.1 -0.2 0.1)
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