Fix some bugs in the dynamic engraver and PostScript backend

[lilypond.git] / scm / lily-library.scm

diff --git a/scm/lily-library.scm b/scm/lily-library.scm
index 8d12c350d796505eb9d9927bd7e6dcc7fbad1f4d..d178c6926c80d7a6c1d1b6c9e9c1d8cb3dcf16b9 100644 (file)
--- a/scm/lily-library.scm
+++ b/scm/lily-library.scm
@@ -310,6 +310,10 @@ 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
@@ -320,10 +324,12 @@ found."
 ;; numbers
 
 (if (not (defined? 'nan?)) ;; guile 1.6 compat
-    (define-public (nan? x) #f))
+    (define-public (nan? x) (not (or (< 0.0 x)
+                                    (> 0.0 x)
+                                    (= 0.0 x)))))
 
 (if (not (defined? 'inf?))
-    (define-public (inf? x) #f))
+    (define-public (inf? x) (= (/ 1.0 x) 0.0)))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; intervals
@@ -333,8 +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)
@@ -368,6 +385,7 @@ found."
            (nan? (cdr i))
            (inf? (cdr i)))))
 
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
 
@@ -410,6 +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))