X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Flily-library.scm;h=d178c6926c80d7a6c1d1b6c9e9c1d8cb3dcf16b9;hb=55c7ef27b5382940b8afe785c94b744c24b98473;hp=d3e75530a3e99678f4ca2f86709554e32065214d;hpb=b0076083131587fe5c09115c5fa69433fdc7db07;p=lilypond.git

diff --git a/scm/lily-library.scm b/scm/lily-library.scm
index d3e75530a3..d178c6926c 100644
--- a/scm/lily-library.scm
+++ b/scm/lily-library.scm
@@ -310,12 +310,27 @@ found."
 (define-public (offset-flip-y o)
   (cons (car o) (- (cdr o))))
 
+(define-public (offset-scale o scale)
+  (cons (* (car o) scale)
+	(* (cdr o) scale)))
+
 (define-public (ly:list->offsets accum coords)
   (if (null? coords)
       accum
       (cons (cons (car coords) (cadr coords))
 	    (ly:list->offsets accum (cddr coords)))))
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; numbers
+
+(if (not (defined? 'nan?)) ;; guile 1.6 compat
+    (define-public (nan? x) (not (or (< 0.0 x)
+				     (> 0.0 x)
+				     (= 0.0 x)))))
+
+(if (not (defined? 'inf?))
+    (define-public (inf? x) (= (/ 1.0 x) 0.0)))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; intervals
 
@@ -324,8 +339,19 @@ found."
   (max 0 (- (cdr x) (car x))))
 
 (define-public interval-start car)
+(define-public (ordered-cons a b)
+  (cons (min a b)
+	(max a b)))
+
 (define-public interval-end cdr)
 
+(define-public (interval-index interval dir)
+  "Interpolate INTERVAL between between left (DIR=-1) and right (DIR=+1)"
+  
+  (* (+  (interval-start interval) (interval-end interval)
+	 (* dir (- (interval-end interval) (interval-start interval))))
+     0.5))
+
 (define-public (interval-center x)
   "Center the number-pair X, when an interval"
   (if (interval-empty? x)
@@ -359,6 +385,7 @@ found."
 	    (nan? (cdr i))
 	    (inf? (cdr i)))))
 
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
 
@@ -401,6 +428,7 @@ possibly turned off."
   (define matches '())
   (define end-of-prev-match 0)
   (define (notice match)
+
     (set! matches (cons (substring (match:string match)
 				   end-of-prev-match
 				   (match:start match))
@@ -479,7 +507,7 @@ possibly turned off."
    (string-append
     input-file-name ": 0: " (_ "warning: ")
    (format #f
-	   (_ "no \\version statement found,  add~afor future compatibility")
+	   (_ "no \\version statement found, please add~afor future compatibility")
 	   (format #f "\n\n\\version ~s\n\n" (lilypond-version))))))
 
 (define-public (old-relative-not-used-message input-file-name)