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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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42
Task/Mandelbrot-set/Emacs-Lisp/mandelbrot-set-1.l
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; === Mandelbrot ============================================
(setq mandel-size (cons 76 34))
(setq xmin -2)
(setq xmax .5)
(setq ymin -1.2)
(setq ymax 1.2)
(setq max-iter 20)
(defun mandel-iter-point (x y)
"Run the actual iteration for each point."
(let ((xp 0)
(yp 0)
(it 0)
(xt 0))
(while (and (< (+ (* xp xp) (* yp yp)) 4) (< it max-iter))
(setq xt (+ (* xp xp) (* -1 yp yp) x))
(setq yp (+ (* 2 xp yp) y))
(setq xp xt)
(setq it (1+ it)))
it))
(defun mandel-iter (p)
"Return string for point based on whether inside/outside the set."
(let ((it (mandel-iter-point (car p) (cdr p))))
(if (= it max-iter) "*" "-")))
(defun mandel-pos (x y)
"Convert screen coordinates to input coordinates."
(let ((xp (+ xmin (* (- xmax xmin) (/ (float x) (car mandel-size)))))
(yp (+ ymin (* (- ymax ymin) (/ (float y) (cdr mandel-size))))))
(cons xp yp)))
(defun mandel ()
"Plot the Mandelbrot set."
(dotimes (y (cdr mandel-size))
(dotimes (x (car mandel-size))
(if (= x 0)
(insert(format "\n%s" (mandel-iter (mandel-pos x y))))
(insert(format "%s" (mandel-iter (mandel-pos x y))))))))
(mandel)

54
Task/Mandelbrot-set/Emacs-Lisp/mandelbrot-set-2.l
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; === Graphical Mandelbrot ============================================
(setq mandel-size (cons 320 300))
(setq xmin -2)
(setq xmax .5)
(setq ymin -1.2)
(setq ymax 1.2)
(setq max-iter 20)
(defun mandel-iter-point (x y)
"Run the actual iteration for each point."
(let ((xp 0)
(yp 0)
(it 0)
(xt 0))
(while (and (< (+ (* xp xp) (* yp yp)) 4) (< it max-iter))
(setq xt (+ (* xp xp) (* -1 yp yp) x))
(setq yp (+ (* 2 xp yp) y))
(setq xp xt)
(setq it (1+ it)))
it))
(defun mandel-iter (p)
"Return string for point based on whether inside/outside the set."
(let ((it (mandel-iter-point (car p) (cdr p))))
(if (= it max-iter) "*" (if (cl-oddp it) "+" "-"))))
(defun mandel-pos (x y)
"Convert screen coordinates to input coordinates."
(let ((xp (+ xmin (* (- xmax xmin) (/ (float x) (car mandel-size)))))
(yp (+ ymin (* (- ymax ymin) (/ (float y) (cdr mandel-size))))))
(cons xp yp)))
(defun string-to-image (str)
"Convert image data string to XPM image."
(create-image (concat (format "/* XPM */
static char * mandel[] = {
\"%i %i 3 1\",
\"+ c #ff0000\",
\"- c #0000ff\",
\"* c #000000\"," (car mandel-size) (cdr mandel-size))
str "};") 'xpm t))
(defun mandel-pic ()
"Plot the Mandelbrot set."
(setq all "")
(dotimes (y (cdr mandel-size))
(setq line "")
(dotimes (x (car mandel-size))
(setq line (concat line (mandel-iter (mandel-pos x y)))))
(setq all (concat all "\"" line "\",\n")))
(insert-image (string-to-image all)))
(mandel-pic)