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bug#14074: 24.3.50; Convert hsv to rgb
From: |
Jambunathan K |
Subject: |
bug#14074: 24.3.50; Convert hsv to rgb |
Date: |
Thu, 28 Mar 2013 20:26:15 +0530 |
Convert hsv to rgb.
Here is a little test case.
(let ((color-name (format "#%06x" (random #xffffff))))
(format "color-name: %s round-tripped: %s"
color-name
(apply 'color-rgb-to-hex
(apply 'color-hsv-to-rgb
(apply 'color-rgb-to-hsv
(color-name-to-rgb color-name))))))
=> "color-name: #01043d round-tripped: #01033d"
=> "color-name: #1278e2 round-tripped: #1278e2"
=> "color-name: #ffb4bd round-tripped: #ffb4bd"
One can use `color-hsv-to-rgb' for example in `vc-annotate-color-map'.
=== modified file 'lisp/ChangeLog'
*** lisp/ChangeLog 2013-03-27 16:03:15 +0000
--- lisp/ChangeLog 2013-03-28 14:36:48 +0000
***************
*** 1,3 ****
--- 1,7 ----
+ 2013-03-28 Jambunathan K <kjambunathan@gmail.com>
+
+ * color.el (color-hsv-to-rgb): New defun.
+
2013-03-27 Eli Zaretskii <eliz@gnu.org>
* facemenu.el (list-colors-callback): New defvar.
=== modified file 'lisp/color.el'
*** lisp/color.el 2013-01-11 15:04:24 +0000
--- lisp/color.el 2013-03-28 14:40:31 +0000
***************
*** 118,123 ****
--- 118,148 ----
"Return the color that is the complement of COLOR, in hexadecimal format."
(apply 'color-rgb-to-hex (color-complement color)))
+ (defun color-hsv-to-rgb (h s v)
+ "Convert HSV color components to RGB.
+ HUE should be in radians between 0 and 2*`float-pi', inclusive.
+ SATURATION and VALUE should be between 0.0 and 1.0, inclusive.
+ Return a list (RED GREEN BLUE) where each of the components is
+ between 0.0 and 1.0, inclusive."
+ ;; Convert h from radians to degrees
+ (setq h (/ (* 180.0 h) float-pi))
+ (when (>= h 360) (setq h 0.0))
+ (if (zerop s)
+ (list v v v)
+ (let* ((h (/ h 60.0))
+ (i (floor h))
+ (f (- h i))
+ (l (* v (- 1 s)))
+ (m (* v (- 1 (* s f))))
+ (n (* v (- 1 (* s (- 1 f))))))
+ (cond
+ ((= i 0) (list v n l))
+ ((= i 1) (list m v l))
+ ((= i 2) (list l v n))
+ ((= i 3) (list l m v))
+ ((= i 4) (list n l v))
+ ((= i 5) (list v l m))))))
+
(defun color-rgb-to-hsv (red green blue)
"Convert RGB color components to HSV.
RED, GREEN, and BLUE should each be numbers between 0.0 and 1.0,
In GNU Emacs 24.3.50.1 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
of 2013-03-28 on debian-6.05
Bzr revision: 112161 eliz@gnu.org-20130327160315-f4jh29xefzj11qgu
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
Important settings:
value of $LANG: en_IN
locale-coding-system: iso-latin-1-unix
default enable-multibyte-characters: t
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