lily/piano-pedal-engraver.cc

   1 /*
   2   piano-pedal-engraver.cc --  implement Piano_pedal_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "engraver.hh"
  10 #include "musical-request.hh"
  11 #include "score-element.hh"
  12 #include "item.hh"
  13 #include "lookup.hh"
  14 #include "lily-guile.hh"
  15 #include "rhythmic-head.hh"
  16 #include "stem.hh"
  17 #include "side-position-interface.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "item.hh"
  20
  21
  22 /*
  23    TODO:
  24      * it would be really cool if an engraver could be initialised with a
  25        string, ie:
  26
  27           Piano_pedal_engraver::"sostenuto"
  28           Piano_pedal_engraver::"sustain"
  29           Piano_pedal_engraver::"una-chorda"
  30
  31  */
  32
  33 /*
  34   Would it? The semantics are unclear, and real benefits are muddy
  35   too.  --hwn
  36 */
  37
  38
  39
  40 /**
  41    engrave Piano pedals symbols.
  42  */
  43 class Piano_pedal_engraver : public Engraver
  44 {
  45 public:
  46   VIRTUAL_COPY_CONS (Translator);
  47   Piano_pedal_engraver ();
  48   ~Piano_pedal_engraver ();
  49 protected:
  50   virtual void do_creation_processing ();
  51   virtual bool do_try_music (Music*);
  52   virtual void do_process_music ();
  53   virtual void do_pre_move_processing ();
  54   virtual void do_post_move_processing ();
  55   virtual void acknowledge_element (Score_element_info);
  56
  57 private:
  58   struct Pedal_info
  59   {
  60     char const * name_;
  61     Span_req* start_req_l_;
  62     Drul_array<Span_req*> req_l_drul_;
  63     Item* item_p_;
  64   };
  65
  66
  67   Pedal_info *info_list_;
  68 };
  69
  70 ADD_THIS_TRANSLATOR (Piano_pedal_engraver);
  71
  72 Piano_pedal_engraver::Piano_pedal_engraver ()
  73 {
  74   info_list_ = 0;
  75 }
  76 void
  77 Piano_pedal_engraver::do_creation_processing()
  78 {
  79   info_list_ = new Pedal_info[4];
  80   Pedal_info *p = info_list_;
  81
  82
  83   char * names [] = { "Sostenuto", "Sustain", "UnaChorda", 0  };
  84   char **np = names ;
  85   do
  86     {
  87       p->name_ = *np;
  88       p->item_p_ = 0;
  89       p->req_l_drul_[START] = 0;
  90       p->req_l_drul_[STOP] = 0;
  91       p->start_req_l_ = 0;
  92
  93       p++;
  94     }
  95   while (*(np ++));
  96 }
  97
  98 Piano_pedal_engraver::~Piano_pedal_engraver()
  99 {
 100   delete[] info_list_;
 101 }
 102
 103 /*
 104   Urg: Code dup
 105   I'm a script
 106  */
 107 void
 108 Piano_pedal_engraver::acknowledge_element (Score_element_info info)
 109 {
 110   for (Pedal_info*p = info_list_; p->name_; p ++)
 111     {
 112       if (p->item_p_)
 113         {
 114           if (Rhythmic_head::has_interface (info.elem_l_))
 115             {
 116               Side_position::add_support (p->item_p_, info.elem_l_);
 117
 118               if (Side_position::get_axis(p->item_p_) == X_AXIS
 119                   && !p->item_p_->parent_l (Y_AXIS))
 120                 p->item_p_->set_parent (info.elem_l_, Y_AXIS);
 121             }
 122           if (Stem::has_interface (info.elem_l_))
 123             {
 124               Side_position::add_support (p->item_p_,info.elem_l_);
 125             }
 126         }
 127     }
 128 }
 129
 130 bool
 131 Piano_pedal_engraver::do_try_music (Music *m)
 132 {
 133   if (Span_req * s = dynamic_cast<Span_req*>(m))
 134     {
 135       for (Pedal_info*p = info_list_; p->name_; p ++)
 136         {
 137           if (s->span_type_str_ == p->name_)
 138             {
 139               p->req_l_drul_[s->span_dir_] = s;
 140               return true;
 141             }
 142         }
 143     }
 144   return false;
 145 }
 146
 147 void
 148 Piano_pedal_engraver::do_process_music ()
 149 {
 150   for (Pedal_info*p = info_list_; p->name_; p ++)
 151     {
 152       SCM s = SCM_UNDEFINED;
 153       if (p->req_l_drul_[STOP] && p->req_l_drul_[START])
 154         {
 155           if (!p->start_req_l_)
 156             {
 157               p->req_l_drul_[STOP]->warning (_f ("can't find start of piano pedal: %s",  p->name_ ));
 158             }
 159           else
 160             {
 161               s = get_property (("stopStart" + String (p->name_ )).ch_C());
 162             }
 163           p->start_req_l_ = p->req_l_drul_[START];
 164         }
 165       else if (p->req_l_drul_[STOP])
 166         {
 167           if (!p->start_req_l_)
 168             {
 169               p->req_l_drul_[STOP]->warning (_f ("can't find start of piano pedal: %s", p->name_ ));
 170             }
 171           else
 172             {
 173               s = get_property (("stop" + String (p->name_ )).ch_C());
 174             }
 175           p->start_req_l_ = 0;
 176         }
 177       else if (p->req_l_drul_[START])
 178         {
 179           p->start_req_l_ = p->req_l_drul_[START];
 180           s = get_property (("start" + String (p->name_ )).ch_C());
 181         }
 182
 183       if (gh_string_p (s))
 184         {
 185           if (p->name_ == String ("Sustain"))
 186             {
 187               // fixme: Item should be sufficient.
 188               p->item_p_ = new Item (get_property ("basicSustainPedalProperties"));
 189             }
 190           else
 191             {
 192               p->item_p_ = new Item (get_property ("basicPedalProperties"));
 193             }
 194           p->item_p_->set_elt_property ("text", s);
 195           // guh
 196
 197           Side_position::set_axis (p->item_p_,Y_AXIS);
 198
 199           // todo: init with basic props.
 200           p->item_p_->add_offset_callback (Side_position::aligned_on_self, X_AXIS);
 201           p->item_p_->add_offset_callback (Side_position::centered_on_parent, X_AXIS);
 202           announce_element (Score_element_info (p->item_p_,
 203                                                 p->req_l_drul_[START]
 204                                                 ? p->req_l_drul_[START]
 205                                                 : p->req_l_drul_[STOP]));
 206         }
 207     }
 208 }
 209
 210 void
 211 Piano_pedal_engraver::do_pre_move_processing ()
 212 {
 213   Item * sustain = 0;
 214   for (Pedal_info*p = info_list_; p->name_; p ++)
 215     {
 216       if (p->name_ == String ("Sustain"))
 217         sustain = p->item_p_;
 218     }
 219
 220   for (Pedal_info*p = info_list_; p->name_; p ++)
 221     {
 222       if (p->item_p_)
 223         {
 224           Side_position::add_staff_support (p->item_p_);
 225           /*
 226             Hmm.
 227           */
 228           if (p->name_ != String ("Sustain"))
 229             {
 230               if (sustain)
 231                 {
 232                   Side_position::add_support (p->item_p_,sustain);
 233                 }
 234             }
 235           typeset_element (p->item_p_);
 236         }
 237       p->item_p_ = 0;
 238     }
 239 }
 240
 241 void
 242 Piano_pedal_engraver::do_post_move_processing ()
 243 {
 244   for (Pedal_info*p = info_list_; p->name_; p ++)
 245     {
 246       p->req_l_drul_[STOP] = 0;
 247       p->req_l_drul_[START] = 0;
 248     }
 249 }