lily/pitched-trill-engraver.cc

   1 /*
   2   pitched-trill-engraver.cc -- implement Pitched_trill_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "engraver.hh"
  11
  12 #include "dots.hh"
  13 #include "pointer-group-interface.hh"
  14 #include "axis-group-interface.hh"
  15 #include "context.hh"
  16 #include "note-head.hh"
  17 #include "item.hh"
  18 #include "side-position-interface.hh"
  19 #include "pitch.hh"
  20 #include "warn.hh"
  21
  22 class Pitched_trill_engraver : public Engraver
  23 {
  24
  25 public:
  26   TRANSLATOR_DECLARATIONS(Pitched_trill_engraver);
  27
  28 protected:
  29
  30   DECLARE_ACKNOWLEDGER( note_head);
  31   DECLARE_ACKNOWLEDGER( dots);
  32   DECLARE_ACKNOWLEDGER( text_spanner);
  33   void process_music ();
  34   virtual bool try_music (Music*);
  35   void stop_translation_timestep ();
  36 private:
  37   Item *trill_head_;
  38   Item *trill_group_;
  39   Item *trill_accidental_;
  40
  41   Link_array<Grob> heads_;
  42
  43   void make_trill (Music *);
  44 };
  45
  46
  47 Pitched_trill_engraver::Pitched_trill_engraver ()
  48 {
  49   trill_head_ = 0;
  50   trill_group_ = 0;
  51   trill_accidental_ = 0;
  52 }
  53
  54 void
  55 Pitched_trill_engraver::acknowledge_dots (Grob_info info)
  56 {
  57   heads_.push (info.grob ());
  58 }
  59 void
  60 Pitched_trill_engraver::acknowledge_note_head (Grob_info info)
  61 {
  62   heads_.push (info.grob ());
  63 }
  64
  65 void
  66 Pitched_trill_engraver::acknowledge_text_spanner (Grob_info info)
  67 {
  68   Music *mus = info.music_cause ();
  69   if (mus
  70       && mus->is_mus_type ("trill-span-event")
  71       && to_dir (mus->get_property ("span-direction")) == START
  72       && unsmob_pitch (mus->get_property ("trill-pitch")))
  73     {
  74       make_trill (mus);
  75     }
  76 }
  77
  78 void
  79 Pitched_trill_engraver::make_trill (Music *mus)
  80 {
  81   SCM scm_pitch = mus->get_property ("trill-pitch");
  82   Pitch * p = unsmob_pitch (scm_pitch);
  83
  84   SCM keysig = get_property ("localKeySignature");
  85
  86   SCM key = scm_cons (scm_from_int (p->get_octave ()),
  87                       scm_from_int (p->get_notename ()));
  88
  89   SCM handle = scm_assoc (key, keysig);
  90   bool print_acc =
  91     (handle == SCM_BOOL_F)
  92     || p->get_alteration () == 0;
  93
  94   if (trill_head_)
  95     {
  96       programming_error ("already have a trill head.");
  97       trill_head_ = 0;
  98     }
  99
 100   trill_head_ = make_item ("TrillPitchHead", mus->self_scm ());
 101   SCM c0scm = get_property ("middleCPosition");
 102
 103   int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
 104
 105   trill_head_->set_property ("staff-position",
 106                              scm_from_int (unsmob_pitch (scm_pitch)->steps ()
 107                                            + c0));
 108
 109   trill_group_ = make_item ("TrillPitchGroup", mus->self_scm());
 110
 111   Axis_group_interface::add_element (trill_group_,  trill_head_);
 112
 113   if (print_acc)
 114     {
 115       trill_accidental_ = make_item ("TrillPitchAccidental", mus->self_scm ());
 116
 117       // fixme: naming -> alterations
 118       trill_accidental_->set_property ("accidentals", scm_list_1 (scm_from_int (p->get_alteration ())));
 119       Side_position_interface::add_support (trill_accidental_, trill_head_);
 120       trill_head_->set_object ("accidental-grob", trill_accidental_->self_scm ());
 121       trill_group_->set_parent (trill_head_, Y_AXIS);
 122       Axis_group_interface::add_element (trill_group_, trill_accidental_);
 123       trill_accidental_->set_parent (trill_head_, Y_AXIS);
 124     }
 125 }
 126
 127 void
 128 Pitched_trill_engraver::stop_translation_timestep ()
 129 {
 130   if (trill_group_)
 131     for (int i = 0; i < heads_.size (); i++)
 132       {
 133         Side_position_interface::add_support (trill_group_, heads_[i]);
 134       }
 135
 136   heads_.clear ();
 137   trill_head_ = 0;
 138   trill_group_ = 0;
 139   trill_accidental_ = 0;
 140 }
 141
 142 void
 143 Pitched_trill_engraver::process_music ()
 144 {
 145 }
 146
 147 bool
 148 Pitched_trill_engraver::try_music (Music *)
 149 {
 150   return false;
 151 }
 152
 153 #include "translator.icc"
 154 ADD_ACKNOWLEDGER(Pitched_trill_engraver, note_head);
 155 ADD_ACKNOWLEDGER(Pitched_trill_engraver, dots);
 156 ADD_ACKNOWLEDGER(Pitched_trill_engraver, text_spanner);
 157 ADD_TRANSLATOR (Pitched_trill_engraver,
 158                 /* descr */ "Print the bracketed notehead after a notehead with trill.",
 159                 /* creats*/ "TrillPitchHead TrillPitchAccidental TrillPitchGroup",
 160                 /* accepts */ "",
 161                 /* reads */ "",
 162                 /* write */ "");