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 "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   virtual void acknowledge_grob (Grob_info);
  30   virtual void process_music ();
  31   virtual bool try_music (Music*);
  32   virtual void stop_translation_timestep ();
  33 private:
  34   Item *trill_head_;
  35   Item *trill_group_;
  36   Item *trill_accidental_;
  37
  38   Link_array<Grob> heads_;
  39
  40   void make_trill (Music *);
  41 };
  42
  43
  44 Pitched_trill_engraver::Pitched_trill_engraver ()
  45 {
  46   trill_head_ = 0;
  47   trill_group_ = 0;
  48   trill_accidental_ = 0;
  49 }
  50
  51 void
  52 Pitched_trill_engraver::acknowledge_grob (Grob_info info)
  53 {
  54   Music *mus = info.music_cause ();
  55
  56   if (Note_head::has_interface (info.grob ())
  57       || Dots::has_interface (info.grob ()))
  58     {
  59       heads_.push (info.grob ());
  60     }
  61   else if (mus
  62            && mus->is_mus_type ("trill-span-event")
  63            && to_dir (mus->get_property ("span-direction")) == START
  64            && unsmob_pitch (mus->get_property ("trill-pitch")))
  65     {
  66       make_trill (mus);
  67     }
  68 }
  69
  70 void
  71 Pitched_trill_engraver::make_trill (Music *mus)
  72 {
  73   SCM scm_pitch = mus->get_property ("trill-pitch");
  74   Pitch * p = unsmob_pitch (scm_pitch);
  75
  76   SCM keysig = get_property ("localKeySignature");
  77
  78   SCM key = scm_cons (scm_int2num (p->get_octave ()),
  79                       scm_int2num (p->get_notename ()));
  80
  81   SCM handle = scm_assoc (key, keysig);
  82   bool print_acc =
  83     (handle == SCM_BOOL_F)
  84     || p->get_alteration () == 0;
  85
  86   if (trill_head_)
  87     {
  88       programming_error ("already have a trill head.");
  89       trill_head_ = 0;
  90     }
  91
  92   trill_head_ = make_item ("TrillPitchHead", mus->self_scm ());
  93   SCM c0scm = get_property ("middleCPosition");
  94
  95   int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
  96
  97   trill_head_->set_property ("staff-position",
  98                              scm_from_int (unsmob_pitch (scm_pitch)->steps ()
  99                                            + c0));
 100
 101   trill_group_ = make_item ("TrillPitchGroup", mus->self_scm());
 102
 103   Axis_group_interface::add_element (trill_group_,  trill_head_);
 104
 105   if (print_acc)
 106     {
 107       trill_accidental_ = make_item ("TrillPitchAccidental", mus->self_scm ());
 108
 109       // fixme: naming -> alterations
 110       trill_accidental_->set_property ("accidentals", scm_list_1 (scm_from_int (p->get_alteration ())));
 111       Side_position_interface::add_support (trill_accidental_, trill_head_);
 112       trill_head_->set_property ("accidental-grob", trill_accidental_->self_scm ());
 113       trill_group_->set_parent (trill_head_, Y_AXIS);
 114       Axis_group_interface::add_element (trill_group_, trill_accidental_);
 115       trill_accidental_->set_parent (trill_head_, Y_AXIS);
 116     }
 117 }
 118
 119 void
 120 Pitched_trill_engraver::stop_translation_timestep ()
 121 {
 122   if (trill_group_)
 123     for (int i = 0; i < heads_.size (); i++)
 124       {
 125         Side_position_interface::add_support (trill_group_, heads_[i]);
 126       }
 127
 128   heads_.clear ();
 129   trill_head_ = 0;
 130   trill_group_ = 0;
 131   trill_accidental_ = 0;
 132 }
 133
 134 void
 135 Pitched_trill_engraver::process_music ()
 136 {
 137 }
 138
 139 bool
 140 Pitched_trill_engraver::try_music (Music *)
 141 {
 142   return false;
 143 }
 144
 145 ADD_TRANSLATOR (Pitched_trill_engraver,
 146                 /* descr */ "Print the bracketed notehead after a notehead with trill.",
 147                 /* creats*/ "TrillPitchHead TrillPitchAccidental TrillPitchGroup",
 148                 /* accepts */ "",
 149                 /* acks  */ "script-interface text-spanner-interface dots-interface note-head-interface",
 150                 /* reads */ "",
 151                 /* write */ "");