new file for kawabata's mail.

[elisp/munsell.git] / munsell-conv.el

diff --git a/munsell-conv.el b/munsell-conv.el
index 9a051bc..a402d1a 100644 (file)
--- a/munsell-conv.el
+++ b/munsell-conv.el
@@ -10,31 +10,57 @@
        (value-var (nth 1 vars))
        (chroma-var (nth 2 vars)))
     `(let ((,color-var ,color-expr))
-       (if (string-match "^\\(N\\|\\([0-9]+\\(\\.[0-9]*\\)?\\)\\(B\\|BG\\|G\\|GY\\|Y\\|YR\\|R\\|RP\\|P\\|PB\\)\\)\\([0-9]+\\(\\.[0-9]*\\)?\\)/\\([0-9]+\\(\\.[0-9]*\\)?\\)$" ,color-var)
+       (if (string-match "^\\(N\\([0-9]+\\(\\.[0-9]*\\)?\\)\\|\\([0-9]+\\(\\.[0-9]*\\)?\\)\\(B\\|BG\\|G\\|GY\\|Y\\|YR\\|R\\|RP\\|P\\|PB\\)\\([0-9]+\\(\\.[0-9]*\\)?\\)/\\([0-9]+\\(\\.[0-9]*\\)?\\)\\)$" ,color-var)
           (let ((,hue-var
                  (if (match-beginning 2)
-                     (cons (string-to-number (match-string 2 ,color-var))
-                           (match-string 4 ,color-var))
-                   (cons 0 (match-string 1 ,color-var))))
-                (,value-var (string-to-number (match-string 5 ,color-var)))
-                (,chroma-var (string-to-number (match-string 7 ,color-var))))
+                     '(0 . "N")
+                   (cons (string-to-number (match-string 4 ,color-var))
+                         (match-string 6 ,color-var))))
+                (,value-var
+                 (string-to-number
+                  (match-string (if (match-beginning 2) 2 7) ,color-var)))
+                (,chroma-var
+                 (if (match-beginning 2)
+                     0
+                   (string-to-number (match-string 9 ,color-var)))))
             ,body)
         ,(or
           invalid-action
           `(error "invalid munsell color: %s" ,color-var))))))
 
+(defun munsell-hue-round (h &optional round-function)
+  (unless round-function (setq round-function 'round))
+  (let ((h2 (* 5 (apply round-function (car h) '(2.5)))))
+    (if (= h2 0)
+       (concat
+        "10" 
+        (cadr
+         (member
+          (cdr h) '("R" "RP" "P" "PB" "B" "BG" "G" "GY" "Y" "YR" "R"))))
+      (concat
+       (int-to-string (ash h2 -1))
+       (unless (= (logand h2 1) 0) ".5")
+       (cdr h)))))
+
+(defun munsell-value-round (v &optional round-function)
+  (unless round-function (setq round-function 'round))
+  (if (<= v 0.9)
+      (let ((rounded (apply round-function v '(0.2))))
+       (if (= rounded 5)
+           "1"
+         (concat "0." (int-to-string (* 2 rounded)))))
+    (int-to-string (apply round-function v '(1)))))
+
+(defun munsell-chroma-round (c &optional round-function)
+  (unless round-function (setq round-function 'round))
+  (int-to-string (* 2 (apply chroma-round c '(2)))))
+
 (defun munsell-round (h v c hue-round value-round chroma-round)
-  (concat
-   (let ((h2 (* 5 (apply hue-round (car h) '(2.5)))))
-     (if (= (logand h2 1) 0)
-        (int-to-string (ash h2 -1))
-       (concat (int-to-string (ash h2 -1)) ".5")))
-   (cdr h)
-   (if (< v 0.9)
-       (concat "0." (int-to-string (* 2 (apply value-round v '(0.2)))))
-     (int-to-string (apply value-round v '(1))))
-   "/"
-   (int-to-string (* 2 (apply chroma-round c '(2))))))
+  (let ((c-rounded (munsell-chroma-round c chroma-round))
+       (v-rounded (munsell-value-round v value-round)))
+    (if (string= c-rounded "0")
+       (concat "N" v-rounded)
+      (concat (munsell-hue-round h hue-round) v-rounded "/" c-rounded))))
 
 (defun munsell-convert (color)
   (munsell-split color (h v c)