lily/chord-name-engraver.cc

   1 /*
   2   chord-name-engraver.cc -- implement Chord_name_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2002 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "chord-name.hh"
  11 #include "chord.hh"
  12 #include "musical-request.hh"
  13 #include "paper-def.hh"
  14 #include "font-interface.hh"
  15 #include "paper-def.hh"
  16 #include "main.hh"
  17 #include "dimensions.hh"
  18 #include "item.hh"
  19 #include "pitch.hh"
  20 #include "protected-scm.hh"
  21
  22 class Chord_name_engraver : public Engraver
  23 {
  24   TRANSLATOR_DECLARATIONS( Chord_name_engraver);
  25 protected:
  26   virtual void stop_translation_timestep ();
  27   virtual void process_music ();
  28   virtual bool try_music (Music *);
  29
  30 private:
  31   void add_note (Note_req *);
  32
  33   Item* chord_name_;
  34
  35   Protected_scm chord_;
  36   Protected_scm last_chord_;
  37 };
  38
  39
  40
  41 Chord_name_engraver::Chord_name_engraver ()
  42 {
  43   chord_name_ = 0;
  44   chord_ = gh_cons (SCM_EOL, gh_cons (SCM_EOL, SCM_EOL));
  45   last_chord_ = chord_;
  46 }
  47
  48 void
  49 Chord_name_engraver::add_note (Note_req* n)
  50 {
  51   SCM pitches = ly_car (chord_);
  52   SCM modifiers = ly_cdr (chord_);
  53   SCM inversion = modifiers == SCM_EOL ? SCM_EOL : ly_car (modifiers);
  54   SCM bass = modifiers == SCM_EOL ? SCM_EOL : ly_cdr (modifiers);
  55
  56   if (n->get_mus_property ("inversion") == SCM_BOOL_T)
  57     inversion = n->get_mus_property ("pitch");
  58   else if (n->get_mus_property ("bass") == SCM_BOOL_T)
  59     bass = n->get_mus_property ("pitch");
  60   else
  61     pitches = scm_sort_list (gh_cons (n->get_mus_property ("pitch"), pitches),
  62                              Pitch::less_p_proc);
  63   chord_ = gh_cons (pitches, gh_cons (inversion, bass));
  64 }
  65
  66 bool
  67 Chord_name_engraver::try_music (Music* m)
  68 {
  69   if (Note_req* n = dynamic_cast<Note_req*> (m))
  70     {
  71       add_note (n);
  72       return true;
  73     }
  74   return false;
  75 }
  76
  77 void
  78 Chord_name_engraver::process_music ()
  79 {
  80   if (ly_car (chord_) != SCM_EOL)
  81     {
  82       chord_name_ = new Item (get_property ("ChordName"));
  83       chord_name_->set_grob_property ("chord", chord_);
  84       announce_grob(chord_name_, SCM_EOL);
  85       SCM s = get_property ("chordChanges");
  86       if (to_boolean (s) && ly_car (last_chord_) != SCM_EOL
  87                   && gh_equal_p (chord_, last_chord_))
  88         chord_name_->set_grob_property ("begin-of-line-visible", SCM_BOOL_T);
  89     }
  90 }
  91
  92 void
  93 Chord_name_engraver::stop_translation_timestep ()
  94 {
  95   if (chord_name_)
  96     {
  97       typeset_grob (chord_name_);
  98     }
  99   chord_name_ = 0;
 100
 101   if (ly_car (chord_) != SCM_EOL)
 102     last_chord_ = chord_;
 103   chord_ = gh_cons (SCM_EOL, gh_cons (SCM_EOL, SCM_EOL));
 104 }
 105
 106 ENTER_DESCRIPTION(Chord_name_engraver,
 107 /* descr */       "Catch Note_req's, Tonic_reqs, Inversion_reqs, Bass_req
 108 and generate the appropriate chordname.",
 109 /* creats*/       "ChordName",
 110 /* acks  */       "",
 111 /* reads */       "chordChanges",
 112 /* write */       "");