lily/pitched-trill-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21
  22 #include "axis-group-interface.hh"
  23 #include "context.hh"
  24 #include "dots.hh"
  25 #include "item.hh"
  26 #include "note-head.hh"
  27 #include "pitch.hh"
  28 #include "pointer-group-interface.hh"
  29 #include "side-position-interface.hh"
  30 #include "stream-event.hh"
  31 #include "warn.hh"
  32
  33 class Pitched_trill_engraver : public Engraver
  34 {
  35 public:
  36   TRANSLATOR_DECLARATIONS (Pitched_trill_engraver);
  37
  38 protected:
  39   DECLARE_ACKNOWLEDGER (note_head);
  40   DECLARE_ACKNOWLEDGER (dots);
  41   DECLARE_ACKNOWLEDGER (trill_spanner);
  42   void stop_translation_timestep ();
  43
  44 private:
  45   Item *trill_head_;
  46   Item *trill_group_;
  47   Item *trill_accidental_;
  48
  49   vector<Grob*> heads_;
  50
  51   void make_trill (Stream_event *);
  52 };
  53
  54 Pitched_trill_engraver::Pitched_trill_engraver ()
  55 {
  56   trill_head_ = 0;
  57   trill_group_ = 0;
  58   trill_accidental_ = 0;
  59 }
  60
  61 void
  62 Pitched_trill_engraver::acknowledge_dots (Grob_info info)
  63 {
  64   heads_.push_back (info.grob ());
  65 }
  66 void
  67 Pitched_trill_engraver::acknowledge_note_head (Grob_info info)
  68 {
  69   heads_.push_back (info.grob ());
  70 }
  71
  72 void
  73 Pitched_trill_engraver::acknowledge_trill_spanner (Grob_info info)
  74 {
  75   Stream_event *ev = info.event_cause ();
  76   if (ev
  77       && ev->in_event_class ("trill-span-event")
  78       && to_dir (ev->get_property ("span-direction")) == START
  79       && unsmob_pitch (ev->get_property ("pitch")))
  80     make_trill (ev);
  81 }
  82
  83 void
  84 Pitched_trill_engraver::make_trill (Stream_event *ev)
  85 {
  86   SCM scm_pitch = ev->get_property ("pitch");
  87   Pitch *p = unsmob_pitch (scm_pitch);
  88
  89   SCM keysig = get_property ("localKeySignature");
  90
  91   SCM key = scm_cons (scm_from_int (p->get_octave ()),
  92                       scm_from_int (p->get_notename ()));
  93
  94   int bn = measure_number (context());
  95
  96   SCM handle = scm_assoc (key, keysig);
  97   if (handle != SCM_BOOL_F)
  98     {
  99       bool same_bar = (bn == robust_scm2int (scm_caddr (handle), 0));
 100       bool same_alt
 101         = (p->get_alteration () == robust_scm2rational (scm_cadr (handle), 0));
 102
 103       if (!same_bar || (same_bar && !same_alt))
 104         handle = SCM_BOOL_F;
 105     }
 106
 107   bool print_acc
 108     = (handle == SCM_BOOL_F) || p->get_alteration () == Rational (0)
 109     || (ev->get_property ("force-accidental") == SCM_BOOL_T);
 110
 111   if (trill_head_)
 112     {
 113       programming_error ("already have a trill head.");
 114       trill_head_ = 0;
 115     }
 116
 117   trill_head_ = make_item ("TrillPitchHead", ev->self_scm ());
 118   SCM c0scm = get_property ("middleCPosition");
 119
 120   int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
 121
 122   trill_head_->set_property ("staff-position",
 123                              scm_from_int (unsmob_pitch (scm_pitch)->steps ()
 124                                            + c0));
 125
 126   trill_group_ = make_item ("TrillPitchGroup", ev->self_scm ());
 127   trill_group_->set_parent (trill_head_, Y_AXIS);
 128
 129   Axis_group_interface::add_element (trill_group_, trill_head_);
 130
 131   if (print_acc)
 132     {
 133       trill_accidental_ = make_item ("TrillPitchAccidental", ev->self_scm ());
 134
 135       // fixme: naming -> alterations
 136       trill_accidental_->set_property ("alteration", ly_rational2scm (p->get_alteration ()));
 137       Side_position_interface::add_support (trill_accidental_, trill_head_);
 138
 139       trill_head_->set_object ("accidental-grob", trill_accidental_->self_scm ());
 140       trill_accidental_->set_parent (trill_head_, Y_AXIS);
 141       Axis_group_interface::add_element (trill_group_, trill_accidental_);
 142     }
 143 }
 144
 145 void
 146 Pitched_trill_engraver::stop_translation_timestep ()
 147 {
 148   if (trill_group_)
 149     for (vsize i = 0; i < heads_.size (); i++)
 150       Side_position_interface::add_support (trill_group_, heads_[i]);
 151
 152   heads_.clear ();
 153   trill_head_ = 0;
 154   trill_group_ = 0;
 155   trill_accidental_ = 0;
 156 }
 157
 158
 159 #include "translator.icc"
 160
 161 ADD_ACKNOWLEDGER (Pitched_trill_engraver, note_head);
 162 ADD_ACKNOWLEDGER (Pitched_trill_engraver, dots);
 163 ADD_ACKNOWLEDGER (Pitched_trill_engraver, trill_spanner);
 164
 165 ADD_TRANSLATOR (Pitched_trill_engraver,
 166                 /* doc */
 167                 "Print the bracketed note head after a note head with trill.",
 168
 169                 /* create */
 170                 "TrillPitchHead "
 171                 "TrillPitchAccidental "
 172                 "TrillPitchGroup ",
 173
 174                 /* read */
 175                 "",
 176
 177                 /* write */
 178                 ""
 179                 );