lily/duration.cc

   1 /*
   2   duration.cc -- implement Duration, Plet,
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c)  1997--2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7            Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8
   9 */
  10
  11 #include <assert.h>
  12
  13 #include "lily-proto.hh"
  14 #include "string.hh"
  15 #include "moment.hh"
  16 #include "duration.hh"
  17
  18 Duration::Duration ()
  19 {
  20   durlog_i_ = 0;
  21   dots_i_ = 0;
  22   tuplet_iso_i_ = 1;
  23   tuplet_type_i_ = 1;
  24 }
  25
  26 void
  27 Duration::compress (Rational m)
  28 {
  29   tuplet_iso_i_  *= m.num_i ();
  30   tuplet_type_i_ *= m.den_i ();
  31 }
  32
  33 Rational
  34 Duration::length_mom () const
  35 {
  36   Rational mom (1 << abs (durlog_i_));
  37
  38   if (durlog_i_> 0)
  39     mom = Moment (1)/mom;
  40
  41   Rational delta = mom;
  42
  43   for (int d = dots_i_; d; d--)
  44     {
  45       delta /= Moment (2);
  46       mom += delta;
  47     }
  48
  49   return mom * Moment (tuplet_iso_i_, tuplet_type_i_);
  50 }
  51
  52 void
  53 Duration::set_plet (int i, int t)
  54 {
  55   tuplet_iso_i_ = i;
  56   tuplet_type_i_ = t;
  57 }
  58
  59
  60 String
  61 Duration::str () const
  62 {
  63   return to_str (durlog_i_) + to_str ('.', dots_i_);
  64 }
  65
  66
  67 bool
  68 Duration::plet_b ()
  69 {
  70   return tuplet_iso_i_ != 1 || tuplet_type_i_ != 1;
  71 }
  72
  73