comparison base/methods.lisp @ 233:eb4d239f5437

add some time-related generic functions to base

Ignore-this: 8ad91dcfa5c8a0301c29dda7d2f27802

darcs-hash:20100212101520-16a00-6821cd98b78bf27be148e3e7e4b46c8f0b80928b.gz

committer: Jamie Forth <[e-mail]>

           (next-start (time+ start bar-duration) (time+ start bar-duration)))
          ((time> next-start moment)
           (make-standard-anchored-period (timepoint start)
                                          (duration bar-duration))))))
 
+(defmethod ioi-from-bar ((event event))
+  (- (timepoint (onset event))
+     (timepoint (current-bar event (composition event)))))
+
+(defmethod ioi-from-bar ((constituent constituent))
+  (- (timepoint (onset constituent))
+     (timepoint (current-bar constituent constituent))))
+
+(defmethod onset-in-bar ((o moment))
+  (1+ (ioi-from-bar o)))
+
 (defmethod beat-period ((moment standard-moment)
                         (time-signature standard-time-signature)
                         (composition composition))
   ;; Simple example - standard-time-signature has constant tactus
   (let* ((containing-bar (current-bar moment composition))