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--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver.hh"
  10
  11 #include "axis-group-interface.hh"
  12 #include "context.hh"
  13 #include "dots.hh"
  14 #include "item.hh"
  15 #include "note-head.hh"
  16 #include "pitch.hh"
  17 #include "pointer-group-interface.hh"
  18 #include "side-position-interface.hh"
  19 #include "stream-event.hh"
  20 #include "warn.hh"
  21
  22 class Pitched_trill_engraver : public Engraver
  23 {
  24 public:
  25   TRANSLATOR_DECLARATIONS (Pitched_trill_engraver);
  26
  27 protected:
  28   DECLARE_ACKNOWLEDGER (note_head);
  29   DECLARE_ACKNOWLEDGER (dots);
  30   DECLARE_ACKNOWLEDGER (trill_spanner);
  31   void stop_translation_timestep ();
  32
  33 private:
  34   Item *trill_head_;
  35   Item *trill_group_;
  36   Item *trill_accidental_;
  37
  38   vector<Grob*> heads_;
  39
  40   void make_trill (Stream_event *);
  41 };
  42
  43 Pitched_trill_engraver::Pitched_trill_engraver ()
  44 {
  45   trill_head_ = 0;
  46   trill_group_ = 0;
  47   trill_accidental_ = 0;
  48 }
  49
  50 void
  51 Pitched_trill_engraver::acknowledge_dots (Grob_info info)
  52 {
  53   heads_.push_back (info.grob ());
  54 }
  55 void
  56 Pitched_trill_engraver::acknowledge_note_head (Grob_info info)
  57 {
  58   heads_.push_back (info.grob ());
  59 }
  60
  61 void
  62 Pitched_trill_engraver::acknowledge_trill_spanner (Grob_info info)
  63 {
  64   Stream_event *ev = info.event_cause ();
  65   if (ev
  66       && ev->in_event_class ("trill-span-event")
  67       && to_dir (ev->get_property ("span-direction")) == START
  68       && unsmob_pitch (ev->get_property ("pitch")))
  69     make_trill (ev);
  70 }
  71
  72 void
  73 Pitched_trill_engraver::make_trill (Stream_event *ev)
  74 {
  75   SCM scm_pitch = ev->get_property ("pitch");
  76   Pitch *p = unsmob_pitch (scm_pitch);
  77
  78   SCM keysig = get_property ("localKeySignature");
  79
  80   SCM key = scm_cons (scm_from_int (p->get_octave ()),
  81                       scm_from_int (p->get_notename ()));
  82
  83   int bn = measure_number (context());
  84
  85   SCM handle = scm_assoc (key, keysig);
  86   if (handle != SCM_BOOL_F)
  87     {
  88       bool same_bar = (bn == robust_scm2int (scm_caddr (handle), 0));
  89       bool same_alt
  90         = (p->get_alteration () == robust_scm2rational (scm_cadr (handle), 0));
  91
  92       if (!same_bar || (same_bar && !same_alt))
  93         handle = SCM_BOOL_F;
  94     }
  95
  96   bool print_acc
  97     = (handle == SCM_BOOL_F) || p->get_alteration () == Rational (0)
  98     || (ev->get_property ("force-accidental") == SCM_BOOL_T);
  99
 100   if (trill_head_)
 101     {
 102       programming_error ("already have a trill head.");
 103       trill_head_ = 0;
 104     }
 105
 106   trill_head_ = make_item ("TrillPitchHead", ev->self_scm ());
 107   SCM c0scm = get_property ("middleCPosition");
 108
 109   int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
 110
 111   trill_head_->set_property ("staff-position",
 112                              scm_from_int (unsmob_pitch (scm_pitch)->steps ()
 113                                            + c0));
 114
 115   trill_group_ = make_item ("TrillPitchGroup", ev->self_scm ());
 116   trill_group_->set_parent (trill_head_, Y_AXIS);
 117
 118   Axis_group_interface::add_element (trill_group_, trill_head_);
 119
 120   if (print_acc)
 121     {
 122       trill_accidental_ = make_item ("TrillPitchAccidental", ev->self_scm ());
 123
 124       // fixme: naming -> alterations
 125       trill_accidental_->set_property ("alteration", ly_rational2scm (p->get_alteration ()));
 126       Side_position_interface::add_support (trill_accidental_, trill_head_);
 127
 128       trill_head_->set_object ("accidental-grob", trill_accidental_->self_scm ());
 129       trill_accidental_->set_parent (trill_head_, Y_AXIS);
 130       Axis_group_interface::add_element (trill_group_, trill_accidental_);
 131     }
 132 }
 133
 134 void
 135 Pitched_trill_engraver::stop_translation_timestep ()
 136 {
 137   if (trill_group_)
 138     for (vsize i = 0; i < heads_.size (); i++)
 139       Side_position_interface::add_support (trill_group_, heads_[i]);
 140
 141   heads_.clear ();
 142   trill_head_ = 0;
 143   trill_group_ = 0;
 144   trill_accidental_ = 0;
 145 }
 146
 147
 148 #include "translator.icc"
 149
 150 ADD_ACKNOWLEDGER (Pitched_trill_engraver, note_head);
 151 ADD_ACKNOWLEDGER (Pitched_trill_engraver, dots);
 152 ADD_ACKNOWLEDGER (Pitched_trill_engraver, trill_spanner);
 153
 154 ADD_TRANSLATOR (Pitched_trill_engraver,
 155                 /* doc */
 156                 "Print the bracketed note head after a note head with trill.",
 157
 158                 /* create */
 159                 "TrillPitchHead "
 160                 "TrillPitchAccidental "
 161                 "TrillPitchGroup ",
 162
 163                 /* read */
 164                 "",
 165
 166                 /* write */
 167                 ""
 168                 );