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 "lily-guile.hh"
  14 #include "rhythmic-head.hh"
  15 #include "stem.hh"
  16 #include "side-position-interface.hh"
  17 #include "staff-symbol-referencer.hh"
  18 #include "item.hh"
  19
  20
  21
  22
  23
  24 /**
  25    engrave Piano pedals symbols.
  26  */
  27 class Piano_pedal_engraver : public Engraver
  28 {
  29 public:
  30   VIRTUAL_COPY_CONS (Translator);
  31   Piano_pedal_engraver ();
  32   ~Piano_pedal_engraver ();
  33 protected:
  34   virtual void do_creation_processing ();
  35   virtual bool do_try_music (Music*);
  36   virtual void do_process_music ();
  37   virtual void do_pre_move_processing ();
  38   virtual void do_post_move_processing ();
  39   virtual void acknowledge_element (Score_element_info);
  40
  41 private:
  42   struct Pedal_info
  43   {
  44     char const * name_;
  45     Span_req* start_req_l_;
  46     Drul_array<Span_req*> req_l_drul_;
  47     Item* item_p_;
  48   };
  49
  50
  51   Pedal_info *info_list_;
  52 };
  53
  54 ADD_THIS_TRANSLATOR (Piano_pedal_engraver);
  55
  56 Piano_pedal_engraver::Piano_pedal_engraver ()
  57 {
  58   info_list_ = 0;
  59 }
  60 void
  61 Piano_pedal_engraver::do_creation_processing()
  62 {
  63   info_list_ = new Pedal_info[4];
  64   Pedal_info *p = info_list_;
  65
  66
  67   char * names [] = { "Sostenuto", "Sustain", "UnaChorda", 0  };
  68   char **np = names ;
  69   do
  70     {
  71       p->name_ = *np;
  72       p->item_p_ = 0;
  73       p->req_l_drul_[START] = 0;
  74       p->req_l_drul_[STOP] = 0;
  75       p->start_req_l_ = 0;
  76
  77       p++;
  78     }
  79   while (*(np ++));
  80 }
  81
  82 Piano_pedal_engraver::~Piano_pedal_engraver()
  83 {
  84   delete[] info_list_;
  85 }
  86
  87 /*
  88   Urg: Code dup
  89   I'm a script
  90  */
  91 void
  92 Piano_pedal_engraver::acknowledge_element (Score_element_info info)
  93 {
  94   for (Pedal_info*p = info_list_; p->name_; p ++)
  95     {
  96       if (p->item_p_)
  97         {
  98           if (Rhythmic_head::has_interface (info.elem_l_))
  99             {
 100               Side_position::add_support (p->item_p_, info.elem_l_);
 101
 102               if (Side_position::get_axis(p->item_p_) == X_AXIS
 103                   && !p->item_p_->parent_l (Y_AXIS))
 104                 p->item_p_->set_parent (info.elem_l_, Y_AXIS);
 105             }
 106           if (Stem::has_interface (info.elem_l_))
 107             {
 108               Side_position::add_support (p->item_p_,info.elem_l_);
 109             }
 110         }
 111     }
 112 }
 113
 114 bool
 115 Piano_pedal_engraver::do_try_music (Music *m)
 116 {
 117   if (Span_req * s = dynamic_cast<Span_req*>(m))
 118     {
 119       for (Pedal_info*p = info_list_; p->name_; p ++)
 120         {
 121           if (s->span_type_str_ == p->name_)
 122             {
 123               p->req_l_drul_[s->get_span_dir()] = s;
 124               return true;
 125             }
 126         }
 127     }
 128   return false;
 129 }
 130
 131 void
 132 Piano_pedal_engraver::do_process_music ()
 133 {
 134   for (Pedal_info*p = info_list_; p->name_; p ++)
 135     {
 136       SCM s = SCM_UNDEFINED;
 137       if (p->req_l_drul_[STOP] && p->req_l_drul_[START])
 138         {
 139           if (!p->start_req_l_)
 140             {
 141               p->req_l_drul_[STOP]->origin ()->warning (_f ("can't find start of piano pedal: %s",  p->name_ ));
 142             }
 143           else
 144             {
 145               s = get_property (("stopStart" + String (p->name_ )).ch_C());
 146             }
 147           p->start_req_l_ = p->req_l_drul_[START];
 148         }
 149       else if (p->req_l_drul_[STOP])
 150         {
 151           if (!p->start_req_l_)
 152             {
 153               p->req_l_drul_[STOP]->origin ()->warning (_f ("can't find start of piano pedal: %s", p->name_ ));
 154             }
 155           else
 156             {
 157               s = get_property (("stop" + String (p->name_ )).ch_C());
 158             }
 159           p->start_req_l_ = 0;
 160         }
 161       else if (p->req_l_drul_[START])
 162         {
 163           p->start_req_l_ = p->req_l_drul_[START];
 164           s = get_property (("start" + String (p->name_ )).ch_C());
 165         }
 166
 167       if (gh_string_p (s))
 168         {
 169           String propname = String (p->name_) + "Pedal";
 170           p->item_p_ = new Item (get_property (propname.ch_C()));
 171           p->item_p_->set_elt_property ("text", s);
 172
 173           announce_element (p->item_p_,
 174                             p->req_l_drul_[START]
 175                             ? p->req_l_drul_[START]
 176                             : p->req_l_drul_[STOP]);
 177         }
 178     }
 179 }
 180
 181 void
 182 Piano_pedal_engraver::do_pre_move_processing ()
 183 {
 184   Item * sustain = 0;
 185   for (Pedal_info*p = info_list_; p->name_; p ++)
 186     {
 187       if (p->name_ == String ("Sustain"))
 188         sustain = p->item_p_;
 189     }
 190
 191   for (Pedal_info*p = info_list_; p->name_; p ++)
 192     {
 193       if (p->item_p_)
 194         {
 195           Side_position::add_staff_support (p->item_p_);
 196           /*
 197             Hmm.
 198           */
 199           if (p->name_ != String ("Sustain"))
 200             {
 201               if (sustain)
 202                 {
 203                   Side_position::add_support (p->item_p_,sustain);
 204                 }
 205             }
 206           typeset_element (p->item_p_);
 207         }
 208       p->item_p_ = 0;
 209     }
 210 }
 211
 212 void
 213 Piano_pedal_engraver::do_post_move_processing ()
 214 {
 215   for (Pedal_info*p = info_list_; p->name_; p ++)
 216     {
 217       p->req_l_drul_[STOP] = 0;
 218       p->req_l_drul_[START] = 0;
 219     }
 220 }