lily/chord-tremolo-engraver.cc

   1 /*
   2   new-chord-tremolo-engraver.cc --  implement Chord_tremolo_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "beam.hh"
  12 #include "repeated-music.hh"
  13 #include "stem.hh"
  14 #include "rhythmic-head.hh"
  15 #include "engraver-group-engraver.hh"
  16 #include "musical-request.hh"
  17 #include "warn.hh"
  18 #include "misc.hh"
  19 #include "note-head.hh"
  20 #include "spanner.hh"
  21 #include "item.hh"
  22 #include "chord-tremolo-iterator.hh"
  23 #include "stem-tremolo.hh"
  24 #include "music-list.hh"
  25
  26 /**
  27   This acknowledges repeated music with "tremolo" style.  It typesets
  28   a beam.
  29
  30   TODO:
  31
  32   - perhaps use engraver this to steer other engravers? That would
  33   create dependencies between engravers, which is bad.
  34
  35   - create dots if appropriate.
  36
  37   - create  TremoloBeam iso Beam?
  38  */
  39
  40 class Chord_tremolo_engraver : public Engraver
  41 {
  42   void typeset_beam ();
  43 public:
  44   VIRTUAL_COPY_CONS(Translator);
  45   Chord_tremolo_engraver();
  46 protected:
  47   Repeated_music * repeat_;
  48
  49   /// moment (global time) where beam started.
  50   Moment start_mom_;
  51   Moment stop_mom_;
  52
  53   /// location  within measure where beam started.
  54   Moment beam_start_location_;
  55
  56   int note_head_i_;
  57
  58   bool sequential_body_b_;
  59   Spanner * beam_p_;
  60   Spanner * finished_beam_p_;
  61   Item * stem_tremolo_;
  62 protected:
  63   virtual void finalize();
  64   virtual bool try_music (Music*);
  65   virtual void acknowledge_grob (Grob_info);
  66   virtual void stop_translation_timestep();
  67   virtual void start_translation_timestep();
  68   virtual void process_music ();
  69 };
  70
  71 Chord_tremolo_engraver::Chord_tremolo_engraver()
  72 {
  73   beam_p_  = finished_beam_p_ = 0;
  74   repeat_ =0;
  75   note_head_i_ = 0;
  76   stem_tremolo_ = 0;
  77   sequential_body_b_ = false;
  78 }
  79
  80 bool
  81 Chord_tremolo_engraver::try_music (Music * m)
  82 {
  83   Repeated_music * rp = dynamic_cast<Repeated_music*> (m);
  84   if (rp
  85       && rp->get_mus_property ("iterator-ctor") == Chord_tremolo_iterator::constructor_cxx_function
  86       && !repeat_)
  87     {
  88       Moment l = rp->length_mom ();
  89       repeat_ = rp;
  90       start_mom_ = now_mom ();
  91       stop_mom_ = start_mom_ + l;
  92       sequential_body_b_ = dynamic_cast<Sequential_music*> (rp->body ());
  93
  94       // ugh. should generate dots, triplet beams.
  95       note_head_i_ = l.den () <? 4;
  96       return true;
  97     }
  98
  99   return false;
 100 }
 101
 102 void
 103 Chord_tremolo_engraver::process_music ()
 104 {
 105   if (repeat_)
 106     {
 107       if (sequential_body_b_ && !beam_p_)
 108         {
 109           beam_p_ = new Spanner (get_property ("Beam"));
 110           Beam::set_interface (beam_p_);
 111           beam_p_->set_grob_property ("chord-tremolo", SCM_BOOL_T);
 112
 113
 114           SCM smp = get_property ("measurePosition");
 115           Moment mp
 116             =  (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
 117           beam_start_location_ = mp;
 118           announce_grob (beam_p_, repeat_);
 119         }
 120       else if (!sequential_body_b_ && !stem_tremolo_)
 121         {
 122           int flags = intlog2(note_head_i_ * repeat_->repeat_count ()) -2;
 123           if (flags)
 124             {
 125               stem_tremolo_ = new Item (get_property ("StemTremolo"));
 126               Stem_tremolo::set_interface (stem_tremolo_);
 127
 128               announce_grob (stem_tremolo_, repeat_);
 129               stem_tremolo_->set_grob_property ("tremolo-flags",
 130                                                 gh_int2scm (flags));
 131
 132             }
 133         }
 134     }
 135 }
 136 void
 137 Chord_tremolo_engraver::finalize ()
 138 {
 139   typeset_beam ();
 140   if (beam_p_)
 141     {
 142       repeat_->origin ()->warning (_ ("unterminated chord tremolo"));
 143       beam_p_->suicide ();
 144     }
 145 }
 146
 147 void
 148 Chord_tremolo_engraver::typeset_beam ()
 149 {
 150   if (finished_beam_p_)
 151     {
 152       typeset_grob (finished_beam_p_);
 153       finished_beam_p_ = 0;
 154     }
 155 }
 156
 157
 158 void
 159 Chord_tremolo_engraver::acknowledge_grob (Grob_info info)
 160 {
 161   if (beam_p_)
 162     {
 163       if (Stem::has_interface (info.elem_l_))
 164         {
 165           Grob * s = info.elem_l_;
 166           int f = Stem::flag_i (s);
 167           f = (f > 2) ? f - 2 : 1;
 168           Stem::set_beaming (s, f, LEFT);
 169           Stem::set_beaming (s, f, RIGHT);
 170
 171           /*
 172             URG: this sets the direction of the Stem s.
 173             It's amazing Mike:
 174
 175               Stem:: type_i () ->first_head ()->get_direction () ->
 176                       Directional_element_interface::set (me, d);
 177
 178
 179               don't understand this comment.
 180                       --hwn.
 181            */
 182           SCM d = s->get_grob_property ("direction");
 183           if (Stem::type_i (s ) != 1)
 184             {
 185               int gap_i =Stem::flag_i (s ) - ((Stem::type_i (s ) >? 2) - 2);
 186               beam_p_->set_grob_property ("beam-gap", gh_int2scm(gap_i));
 187             }
 188           s->set_grob_property ("direction", d);
 189
 190           if (dynamic_cast <Rhythmic_req *> (info.req_l_))
 191             {
 192               Beam::add_stem (beam_p_, s);
 193             }
 194           else
 195             {
 196               String s = _ ("stem must have Rhythmic structure");
 197               if (info.req_l_)
 198                 info.req_l_->origin ()->warning (s);
 199               else
 200                 ::warning (s);
 201             }
 202         }
 203     }
 204   else if (stem_tremolo_ && Stem::has_interface (info.elem_l_))
 205     {
 206        Stem_tremolo::set_stem (stem_tremolo_, info.elem_l_);
 207
 208        info.elem_l_->set_grob_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
 209     }
 210
 211
 212   if (repeat_ && Note_head::has_interface (info.elem_l_))
 213     {
 214       info.elem_l_->set_grob_property ("duration-log", gh_int2scm (intlog2 (note_head_i_)));
 215     }
 216 }
 217
 218
 219 void
 220 Chord_tremolo_engraver::start_translation_timestep ()
 221 {
 222   if (beam_p_ && stop_mom_ == now_mom ())
 223     {
 224       finished_beam_p_ = beam_p_;
 225
 226       repeat_ = 0;
 227       beam_p_ = 0;
 228     }
 229 }
 230
 231
 232 void
 233 Chord_tremolo_engraver::stop_translation_timestep ()
 234 {
 235   typeset_beam ();
 236
 237   if (stem_tremolo_)
 238     {
 239       typeset_grob (stem_tremolo_);
 240       stem_tremolo_ = 0;
 241     }
 242
 243 }
 244
 245 ADD_THIS_TRANSLATOR(Chord_tremolo_engraver);
 246