lily/new-fingering-engraver.cc

   1 /*
   2   fingering-engraver.cc --  implement New_fingering_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "warn.hh"
  11 #include "engraver.hh"
  12 #include "side-position-interface.hh"
  13 #include "item.hh"
  14 #include "event.hh"
  15 #include "stem.hh"
  16 #include "rhythmic-head.hh"
  17 #include "self-alignment-interface.hh"
  18 #include "script.hh"
  19 #include "stem.hh"
  20
  21 struct Finger_tuple
  22 {
  23   Grob *head_;
  24   Grob *script_;
  25   Music *note_event_;
  26   Music *finger_event_;
  27   SCM description_;
  28   int position_;
  29
  30   Finger_tuple ()
  31   {
  32     position_ = 0;
  33     head_ = script_ = 0;
  34     note_event_ = finger_event_ = 0;
  35     description_ = SCM_EOL;
  36   }
  37   static int compare (Finger_tuple const & c1, Finger_tuple const & c2)
  38   {
  39     return c1.position_-  c2.position_;
  40   }
  41
  42 };
  43
  44 class New_fingering_engraver : public Engraver
  45 {
  46   Array<Finger_tuple> fingerings_;
  47   Array<Finger_tuple> articulations_;
  48   Link_array<Grob> heads_;
  49   Grob *stem_;
  50
  51 public:
  52   TRANSLATOR_DECLARATIONS(New_fingering_engraver);
  53 protected:
  54   virtual void stop_translation_timestep ();
  55   virtual void acknowledge_grob (Grob_info);
  56   void add_fingering (Grob*, Music*,Music*);
  57   void add_script  (Grob*, Music*,Music*);
  58   void position_scripts();
  59 };
  60
  61 void
  62 New_fingering_engraver::acknowledge_grob (Grob_info inf)
  63 {
  64   if (Rhythmic_head::has_interface (inf.grob_))
  65     {
  66       Music * note_ev =inf.music_cause ();
  67
  68       SCM arts = note_ev->get_mus_property ("articulations");
  69
  70       for (SCM s = arts; gh_pair_p (s); s = gh_cdr  (s))
  71         {
  72           Music * m = unsmob_music (gh_car (s));
  73
  74           if (!m)
  75             continue;
  76
  77
  78           if (m->is_mus_type ("fingering-event"))
  79             {
  80               add_fingering (inf.grob_ , m, note_ev);
  81             }
  82           else if (m->is_mus_type ("script-event"))
  83             {
  84               add_script (inf.grob_, m, note_ev);
  85             }
  86         }
  87
  88       heads_.push (inf.grob_);
  89     }
  90   else if (Stem::has_interface (inf.grob_))
  91     {
  92       stem_ = inf.grob_;
  93     }
  94 }
  95
  96 extern Grob *make_script_from_event (SCM * descr, Translator_group*tg, Music * event,
  97                               int index);
  98 void
  99 New_fingering_engraver::add_script (Grob * head,
 100                                     Music * event,
 101                                     Music * head_event)
 102 {
 103   Finger_tuple ft ;
 104
 105   ft.script_ =make_script_from_event (&ft.description_, daddy_trans_, event, 0);
 106
 107   articulations_.push (ft);
 108   announce_grob (ft.script_, event->self_scm ());
 109
 110
 111   ft.script_->set_parent (head, X_AXIS);
 112 }
 113
 114
 115
 116 void
 117 New_fingering_engraver::add_fingering (Grob * head,
 118                                        Music * event,
 119                                        Music *hevent)
 120 {
 121   Finger_tuple ft;
 122
 123   ft.script_ = new Item (get_property ("Fingering"));
 124   announce_grob (ft.script_, event->self_scm());
 125
 126   Side_position_interface::add_support (ft.script_, head);
 127
 128   int d = gh_scm2int ( event->get_mus_property ("digit"));
 129
 130   /*
 131     TODO:
 132
 133     Should add support for thumb.  It's a little involved, since
 134     the thumb lives in a different font. Maybe it should be moved?
 135
 136    */
 137
 138   if (d > 5)
 139     {
 140       /*
 141         music for the softenon children?
 142        */
 143       event->origin()->warning (_("music for the martians."));
 144     }
 145   SCM sstr = scm_number_to_string (gh_int2scm (d), gh_int2scm (10)) ;
 146   ft.script_->set_grob_property ("text", sstr);
 147
 148   ft.finger_event_ = event;
 149   ft.note_event_ = hevent;
 150   ft.head_ = head;
 151
 152   fingerings_.push (ft);
 153 }
 154
 155 void
 156 New_fingering_engraver::position_scripts ()
 157 {
 158
 159   /*
 160     This is not extremely elegant, but we have to do a little
 161     formatting here, because the parent/child relations should be
 162     known before we move on to the next time step.
 163
 164     A more sophisticated approach would be to set both X and Y parents
 165     to the note head, and write a more flexible function for
 166     positioning the fingerings, setting both X and Y coordinates.
 167   */
 168   for (int i = 0; i < fingerings_.size(); i++)
 169     {
 170       fingerings_[i].position_ = gh_scm2int (fingerings_[i].head_ -> get_grob_property( "staff-position"));
 171     }
 172
 173   Array<Finger_tuple> up, down, horiz;
 174   for (int i = fingerings_.size(); i--;)
 175     {
 176       SCM d = fingerings_[i].finger_event_->get_mus_property ("direction");
 177       if (to_dir (d))
 178         {
 179           if (to_dir (d) == UP)
 180             {
 181               up.push (fingerings_[i]);
 182             }
 183           else
 184             down.push (fingerings_[i]);
 185           fingerings_.del (i);
 186         }
 187     }
 188
 189   fingerings_.sort (&Finger_tuple::compare);
 190   SCM fhd = get_property ("fingerHorizontalDirection");
 191
 192   if (ly_dir_p (fhd))
 193     {
 194       up.push (fingerings_.pop());
 195       down.push (fingerings_[0]);
 196       fingerings_.del(0);
 197
 198       horiz = fingerings_;
 199     }
 200   else
 201     {
 202       int center = fingerings_.size() / 2;
 203       down.concat (fingerings_.slice (0,center));
 204       up.concat (fingerings_.slice (center, fingerings_.size()));
 205     }
 206
 207   for (int i = 0; i < horiz.size(); i++)
 208     {
 209       Finger_tuple ft = horiz[i];
 210       Grob* f = ft.script_;
 211       f->set_parent (ft.head_, X_AXIS);
 212       f->set_parent (ft.head_, Y_AXIS);
 213       f->add_offset_callback (Self_alignment_interface::centered_on_parent_proc, Y_AXIS);
 214       f->add_offset_callback (Self_alignment_interface::aligned_on_self_proc, Y_AXIS);
 215       f->add_offset_callback (Side_position_interface::aligned_side_proc, X_AXIS);
 216
 217       f->set_grob_property( "direction", fhd);
 218       typeset_grob (f);
 219     }
 220
 221   int finger_prio = 200;
 222   for (int i = 0; i < up.size(); i++)
 223     {
 224       Finger_tuple ft = up[i];
 225       Grob* f = ft.script_;
 226       f->set_parent (ft.head_, X_AXIS);
 227       f->set_grob_property ("script-priority",
 228                             gh_int2scm (finger_prio + i));
 229       f->add_offset_callback (Side_position_interface::aligned_side_proc, Y_AXIS);
 230       f->add_offset_callback (Self_alignment_interface::centered_on_parent_proc, X_AXIS);
 231       f->add_offset_callback (Self_alignment_interface::aligned_on_self_proc, X_AXIS);
 232
 233       f->set_grob_property ("direction", gh_int2scm (UP));
 234
 235       Side_position_interface::add_staff_support (f);
 236       typeset_grob (f);
 237     }
 238
 239   for (int i = 0; i < down.size(); i++)
 240     {
 241       Finger_tuple ft = down[i];
 242       Grob* f = ft.script_;
 243       f->set_parent (ft.head_, X_AXIS);
 244       f->set_grob_property ("script-priority",
 245                             gh_int2scm (finger_prio + down.size() - i));
 246
 247       f->add_offset_callback (Self_alignment_interface::centered_on_parent_proc, X_AXIS);
 248       f->add_offset_callback (Self_alignment_interface::aligned_on_self_proc, X_AXIS);
 249       f->add_offset_callback (Side_position_interface::aligned_side_proc, Y_AXIS);
 250       f->set_grob_property ("direction", gh_int2scm (DOWN));
 251       Side_position_interface::add_staff_support (f);
 252       typeset_grob (f);
 253     }
 254 }
 255
 256 void
 257 New_fingering_engraver::stop_translation_timestep ()
 258 {
 259   if (fingerings_.size ())
 260     {
 261       position_scripts();
 262       fingerings_.clear ();
 263     }
 264
 265   for (int i =  articulations_.size(); i--;)
 266     {
 267       Grob *sc = articulations_[i].script_;
 268
 269       for (int j = heads_.size() ; j--;)
 270         Side_position_interface::add_support (sc, heads_[j]);
 271
 272       if (stem_ && to_dir (sc->get_grob_property ("side-relative-direction")))
 273         sc->set_grob_property ("direction-source", stem_->self_scm ());
 274
 275       SCM follow = scm_assoc (ly_symbol2scm ("follow-into-staff"), articulations_[i].description_);
 276       if (gh_pair_p (follow) && to_boolean (gh_cdr (follow)))
 277         sc->add_offset_callback (Side_position_interface::quantised_position_proc, Y_AXIS);
 278       else
 279         Side_position_interface::add_staff_support (sc);
 280       typeset_grob (sc);
 281     }
 282
 283   stem_ = 0;
 284   heads_.clear ();
 285   articulations_.clear();
 286 }
 287
 288
 289 New_fingering_engraver::New_fingering_engraver()
 290 {
 291   stem_ = 0;
 292 }
 293
 294 ENTER_DESCRIPTION(New_fingering_engraver,
 295 /* descr */       "Create fingering-scripts for notes in a New Chord.",
 296 /* creats*/       "Fingering",
 297 /* accepts */     "text-script-event",
 298 /* acks  */       "rhythmic-head-interface stem-interface",
 299 /* reads */       "fingerHorizontalDirection",
 300 /* write */       "");