(define-public DOWN -1)
(define-public CENTER 0)
-(define-safe-public DOUBLE-FLAT-QTS -4)
-(define-safe-public THREE-Q-FLAT-QTS -3)
-(define-safe-public FLAT-QTS -2)
-(define-safe-public SEMI-FLAT-QTS -1)
-(define-safe-public NATURAL-QTS 0)
-(define-safe-public SEMI-SHARP-QTS 1)
-(define-safe-public SHARP-QTS 2)
-(define-safe-public THREE-Q-SHARP-QTS 3)
-(define-safe-public DOUBLE-SHARP-QTS 4)
-(define-safe-public SEMI-TONE-QTS 2)
-
(define-safe-public DOUBLE-FLAT -1)
(define-safe-public THREE-Q-FLAT -3/4)
(define-safe-public FLAT -1/2)
(define-public (coord-scale coordinate amount)
(coord-operation * amount coordinate))
-(define-public (coord-rotate coordinate degrees-in-radians)
- (let*
- ((coordinate
- (cons
- (exact->inexact (coord-x coordinate))
- (exact->inexact (coord-y coordinate))))
- (radius
- (sqrt
- (+ (* (coord-x coordinate) (coord-x coordinate))
- (* (coord-y coordinate) (coord-y coordinate)))))
- (angle (angle-0-2pi (atan (coord-y coordinate) (coord-x coordinate)))))
- (cons
- (* radius (cos (+ angle degrees-in-radians)))
- (* radius (sin (+ angle degrees-in-radians))))))
+(define-public (coord-rotate coordinate angle-in-radians)
+ ;; getting around (sin PI) not being exactly zero by switching to cos at
+ ;; appropiate angles and/or taking the negative value (vice versa for cos)
+ (let* ((quadrant (inexact->exact (round (/ angle-in-radians (/ PI 2)))))
+ (moved-angle (- angle-in-radians (* quadrant (/ PI 2))))
+ (s (sin moved-angle))
+ (c (cos moved-angle))
+ (x (coord-x coordinate))
+ (y (coord-y coordinate)))
+ (case (modulo quadrant 4)
+ ((0) ;; -45 .. 45
+ (cons (- (* c x) (* s y))
+ (+ (* s x) (* c y))))
+ ((1) ;; 45 .. 135
+ (cons (- (* (- s) x) (* c y))
+ (+ (* c x) (* (- s) y))))
+ ((2) ;; 135 .. 225
+ (cons (- (* (- c) x) (* (- s) y))
+ (+ (* (- s) x) (* (- c) y))))
+ ((3) ;; 225 .. 315
+ (cons (- (* s x) (* (- c) y))
+ (+ (* (- c) x) (* s y))))
+ ;; for other angles (modulo quadrant 4) returns one of the above cases
+ )))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; trig
(define-public (cyclic-base-value value cycle)
"Take @var{value} and modulo-maps it between 0 and base @var{cycle}."
- (if (< value 0)
- (cyclic-base-value (+ value cycle) cycle)
- (if (>= value cycle)
- (cyclic-base-value (- value cycle) cycle)
- value)))
+ (cond ((< value 0)
+ (cyclic-base-value (+ value cycle) cycle))
+ ((>= value cycle)
+ (cyclic-base-value (- value cycle) cycle))
+ (else value)))
(define-public (angle-0-2pi angle)
"Take @var{angle} (in radians) and maps it between 0 and 2pi."
(define-public (string-startswith s prefix)
(equal? prefix (substring s 0 (min (string-length s) (string-length prefix)))))
+(define-public (remove-whitespace strg)
+"Remove characters satisfying @code{char-whitespace?} from string @var{strg}"
+ (string-delete
+ strg
+ char-whitespace?))
+
(define-public (string-encode-integer i)
(cond
((= i 0) "o")
(ly:format "~a:1" input-file-name)
(_ "no \\version statement found, please add~afor future compatibility")
(format #f "\n\n\\version ~s\n\n" (lilypond-version))))
+
+(define-public (output-module? module)
+ "Returns @code{#t} if @var{module} belongs to an output module
+usually carrying context definitions (@code{\\midi} or
+@code{\\layout})."
+ (or (module-ref module 'is-midi #f)
+ (module-ref module 'is-layout #f)))