lily/ambitus-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2010 Juergen Reuter <reuter@ipd.uka.de>
   5
   6   Han-Wen Nienhuys <hanwen@xs4all.nl
   7
   8   LilyPond is free software: you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation, either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   LilyPond is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "engraver.hh"
  23
  24 #include "accidental-placement.hh"
  25 #include "axis-group-interface.hh"
  26 #include "item.hh"
  27 #include "note-head.hh"
  28 #include "pitch-interval.hh"
  29 #include "pointer-group-interface.hh"
  30 #include "protected-scm.hh"
  31 #include "side-position-interface.hh"
  32 #include "separation-item.hh"
  33 #include "staff-symbol-referencer.hh"
  34 #include "stream-event.hh"
  35
  36 #include "translator.icc"
  37
  38 class Ambitus_engraver : public Engraver
  39 {
  40 public:
  41   TRANSLATOR_DECLARATIONS (Ambitus_engraver);
  42 protected:
  43   DECLARE_ACKNOWLEDGER (note_head);
  44
  45   void process_music ();
  46   void stop_translation_timestep ();
  47   virtual void finalize ();
  48   virtual void derived_mark () const;
  49
  50 private:
  51   void create_ambitus ();
  52   Item *ambitus_;
  53   Item *group_;
  54   Drul_array<Item *> heads_;
  55   Drul_array<Item *> accidentals_;
  56   Drul_array<Stream_event *> causes_;
  57   Pitch_interval pitch_interval_;
  58   bool is_typeset_;
  59   int start_c0_;
  60   SCM start_key_sig_;
  61 };
  62
  63 void
  64 Ambitus_engraver::derived_mark () const
  65 {
  66   scm_gc_mark (start_key_sig_);
  67 }
  68
  69 void
  70 Ambitus_engraver::create_ambitus ()
  71 {
  72   ambitus_ = make_item ("AmbitusLine", SCM_EOL);
  73   group_ = make_item ("Ambitus", SCM_EOL);
  74   Direction d = DOWN;
  75   do
  76     {
  77       heads_[d] = make_item ("AmbitusNoteHead", SCM_EOL);
  78       accidentals_[d] = make_item ("AmbitusAccidental", SCM_EOL);
  79       accidentals_[d]->set_parent (heads_[d], Y_AXIS);
  80       heads_[d]->set_object ("accidental-grob",
  81                              accidentals_[d]->self_scm ());
  82       Axis_group_interface::add_element (group_, heads_[d]);
  83       Axis_group_interface::add_element (group_, accidentals_[d]);
  84     }
  85   while (flip (&d) != DOWN);
  86
  87   ambitus_->set_parent (heads_[DOWN], X_AXIS);
  88   Axis_group_interface::add_element (group_, ambitus_);
  89
  90   is_typeset_ = false;
  91 }
  92
  93 Ambitus_engraver::Ambitus_engraver ()
  94 {
  95   ambitus_ = 0;
  96   heads_.set (0, 0);
  97   accidentals_.set (0, 0);
  98   group_ = 0;
  99   is_typeset_ = false;
 100   start_key_sig_ = SCM_EOL;
 101 }
 102
 103 void
 104 Ambitus_engraver::process_music ()
 105 {
 106   /*
 107    * Ensure that ambitus is created in the very first timestep
 108    */
 109   if (!ambitus_)
 110     create_ambitus ();
 111 }
 112
 113 void
 114 Ambitus_engraver::stop_translation_timestep ()
 115 {
 116   if (ambitus_ && !is_typeset_)
 117     {
 118       /*
 119        * Evaluate middleCPosition not until now, since otherwise we
 120        * may then oversee a clef that is defined in a staff context if
 121        * we are in a voice context; middleCPosition would then be
 122        * assumed to be 0.
 123        */
 124       start_c0_ = robust_scm2int (get_property ("middleCPosition"), 0);
 125       start_key_sig_ = get_property ("keySignature");
 126
 127       is_typeset_ = true;
 128     }
 129 }
 130
 131 void
 132 Ambitus_engraver::acknowledge_note_head (Grob_info info)
 133 {
 134   Stream_event *nr = info.event_cause ();
 135   if (nr && nr->in_event_class ("note-event"))
 136     {
 137       SCM p = nr->get_property ("pitch");
 138       /*
 139         If the engraver is added to a percussion context,
 140         filter out unpitched note heads.
 141       */
 142       if (!unsmob_pitch (p))
 143         return;
 144       Pitch pitch = *unsmob_pitch (p);
 145       Drul_array<bool> expands = pitch_interval_.add_point (pitch);
 146       if (expands[UP])
 147         causes_[UP] = nr;
 148       if (expands[DOWN])
 149         causes_[DOWN] = nr;
 150     }
 151 }
 152
 153 void
 154 Ambitus_engraver::finalize ()
 155 {
 156   if (ambitus_ && !pitch_interval_.is_empty ())
 157     {
 158       Grob *accidental_placement =
 159         make_item ("AccidentalPlacement", accidentals_[DOWN]->self_scm ());
 160
 161       Direction d = DOWN;
 162       do
 163         {
 164           Pitch p = pitch_interval_[d];
 165           heads_[d]->set_property ("cause", causes_[d]->self_scm());
 166           heads_[d]->set_property ("staff-position",
 167                                    scm_from_int (start_c0_ + p.steps ()));
 168
 169           SCM handle = scm_assoc (scm_cons (scm_from_int (p.get_octave ()),
 170                                             scm_from_int (p.get_notename ())),
 171                                   start_key_sig_);
 172
 173           if (handle == SCM_BOOL_F)
 174             handle = scm_assoc (scm_from_int (p.get_notename ()),
 175                                 start_key_sig_);
 176
 177           Rational sig_alter = (handle != SCM_BOOL_F)
 178             ? robust_scm2rational (scm_cdr (handle), Rational (0))
 179             : Rational (0);
 180
 181           if (sig_alter == p.get_alteration ())
 182             {
 183               accidentals_[d]->suicide ();
 184               heads_[d]->set_object ("accidental-grob", SCM_EOL);
 185             }
 186           else
 187             accidentals_[d]->
 188               set_property ("alteration",
 189                             ly_rational2scm (p.get_alteration ()));
 190           Separation_item::add_conditional_item (heads_[d],
 191                                                  accidental_placement);
 192           Accidental_placement::add_accidental (accidental_placement,
 193                                                 accidentals_[d]);
 194           Pointer_group_interface::add_grob (ambitus_,
 195                                              ly_symbol2scm ("note-heads"),
 196                                              heads_[d]);
 197         }
 198       while (flip (&d) != DOWN);
 199
 200       Axis_group_interface::add_element (group_, accidental_placement);
 201     }
 202   else
 203     {
 204       Direction d = DOWN;
 205       do
 206         {
 207           accidentals_[d]->suicide ();
 208           heads_[d]->suicide ();
 209         }
 210       while (flip (&d) != DOWN);
 211
 212       ambitus_->suicide ();
 213     }
 214 }
 215
 216 ADD_ACKNOWLEDGER (Ambitus_engraver, note_head);
 217 ADD_TRANSLATOR (Ambitus_engraver,
 218                 /* doc */
 219                 "Create an ambitus.",
 220
 221                 /* create */
 222                 "AccidentalPlacement "
 223                 "Ambitus "
 224                 "AmbitusAccidental "
 225                 "AmbitusLine "
 226                 "AmbitusNoteHead ",
 227
 228                 /* read */
 229                 "keySignature "
 230                 "middleCPosition ",
 231
 232                 /* write */
 233                 ""
 234                 );