lily/include/music.hh

   1 /*
   2   music.hh -- declare Music
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10
  11 #ifndef MUSIC_HH
  12 #define MUSIC_HH
  13
  14 #include "virtual-methods.hh"
  15 #include "input.hh"
  16 #include "minterval.hh"
  17 #include "lily-proto.hh"
  18 #include "string.hh"
  19
  20 /** Music is anything that has duration and supports both time compression and
  21   transposition.
  22
  23   In Lily, everything that can be thought to have a length and a pitch
  24   (which has a duration which can be transposed) is considered "music",
  25
  26   Music is hierarchical:
  27
  28   @see Music_sequence
  29
  30   */
  31 class Music:public Input {
  32 public:
  33
  34
  35   virtual Musical_pitch to_relative_octave (Musical_pitch);
  36
  37   /// The duration of this piece of music
  38   virtual Moment length_mom () const;
  39
  40   virtual ~Music(){}
  41   void print() const;
  42   /// Transpose, with the interval central C to #p#
  43   virtual void transpose (Musical_pitch p);
  44
  45   /// Scale the music in time by #factor#.
  46   virtual void compress (Moment factor);
  47   VIRTUAL_COPY_CONS(Music);
  48
  49   Music();
  50 protected:
  51   virtual void do_print() const;
  52 };
  53
  54 #endif // MUSIC_HH
  55
  56
  57