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 (scm_equal_p (s->get_mus_property ("span-type"),
 122                            ly_str02scm (p->name_))==SCM_BOOL_T)
 123             {
 124               p->req_l_drul_[s->get_span_dir()] = s;
 125               return true;
 126             }
 127         }
 128     }
 129   return false;
 130 }
 131
 132 void
 133 Piano_pedal_engraver::do_process_music ()
 134 {
 135   for (Pedal_info*p = info_list_; p->name_; p ++)
 136     {
 137       SCM s = SCM_UNDEFINED;
 138       if (p->req_l_drul_[STOP] && p->req_l_drul_[START])
 139         {
 140           if (!p->start_req_l_)
 141             {
 142               p->req_l_drul_[STOP]->origin ()->warning (_f ("can't find start of piano pedal: %s",  p->name_ ));
 143             }
 144           else
 145             {
 146               s = get_property (("stopStart" + String (p->name_ )).ch_C());
 147             }
 148           p->start_req_l_ = p->req_l_drul_[START];
 149         }
 150       else if (p->req_l_drul_[STOP])
 151         {
 152           if (!p->start_req_l_)
 153             {
 154               p->req_l_drul_[STOP]->origin ()->warning (_f ("can't find start of piano pedal: %s", p->name_ ));
 155             }
 156           else
 157             {
 158               s = get_property (("stop" + String (p->name_ )).ch_C());
 159             }
 160           p->start_req_l_ = 0;
 161         }
 162       else if (p->req_l_drul_[START])
 163         {
 164           p->start_req_l_ = p->req_l_drul_[START];
 165           s = get_property (("start" + String (p->name_ )).ch_C());
 166         }
 167
 168       if (gh_string_p (s))
 169         {
 170           String propname = String (p->name_) + "Pedal";
 171           p->item_p_ = new Item (get_property (propname.ch_C()));
 172           p->item_p_->set_elt_property ("text", s);
 173
 174           announce_element (p->item_p_,
 175                             p->req_l_drul_[START]
 176                             ? p->req_l_drul_[START]
 177                             : p->req_l_drul_[STOP]);
 178         }
 179     }
 180 }
 181
 182 void
 183 Piano_pedal_engraver::do_pre_move_processing ()
 184 {
 185   Item * sustain = 0;
 186   for (Pedal_info*p = info_list_; p->name_; p ++)
 187     {
 188       if (p->name_ == String ("Sustain"))
 189         sustain = p->item_p_;
 190     }
 191
 192   for (Pedal_info*p = info_list_; p->name_; p ++)
 193     {
 194       if (p->item_p_)
 195         {
 196           Side_position::add_staff_support (p->item_p_);
 197           /*
 198             Hmm.
 199           */
 200           if (p->name_ != String ("Sustain"))
 201             {
 202               if (sustain)
 203                 {
 204                   Side_position::add_support (p->item_p_,sustain);
 205                 }
 206             }
 207           typeset_element (p->item_p_);
 208         }
 209       p->item_p_ = 0;
 210     }
 211 }
 212
 213 void
 214 Piano_pedal_engraver::do_post_move_processing ()
 215 {
 216   for (Pedal_info*p = info_list_; p->name_; p ++)
 217     {
 218       p->req_l_drul_[STOP] = 0;
 219       p->req_l_drul_[START] = 0;
 220     }
 221 }