lily/hara-kiri-engraver.cc

   1 /*
   2   hara-kiri-engraver.cc --  implement Hara_kiri_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "axis-group-engraver.hh"
  11 #include "hara-kiri-group-spanner.hh"
  12 #include "rhythmic-head.hh"
  13 #include "spanner.hh"
  14
  15 #include "translator.icc"
  16
  17 class Hara_kiri_engraver : public Axis_group_engraver
  18 {
  19 protected:
  20   virtual Spanner *get_spanner ();
  21   DECLARE_ACKNOWLEDGER(grob);
  22   virtual void add_element (Grob *e);
  23   void start_translation_timestep ();
  24
  25   SCM interesting_;
  26 public:
  27   TRANSLATOR_DECLARATIONS (Hara_kiri_engraver);
  28 };
  29
  30 void
  31 Hara_kiri_engraver::start_translation_timestep ()
  32 {
  33   Axis_group_engraver::start_translation_timestep ();
  34   interesting_ = get_property ("keepAliveInterfaces");
  35 }
  36
  37
  38 void
  39 Hara_kiri_engraver::add_element (Grob *e)
  40 {
  41   Hara_kiri_group_spanner::add_element (staffline_, e);
  42 }
  43
  44 Spanner *
  45 Hara_kiri_engraver::get_spanner ()
  46 {
  47   Spanner *sp = make_spanner ("RemoveEmptyVerticalGroup", SCM_EOL);
  48
  49   return sp;
  50 }
  51
  52 void
  53 Hara_kiri_engraver::acknowledge_grob (Grob_info i)
  54 {
  55   Axis_group_engraver::acknowledge_grob (i);
  56   if (staffline_)
  57     {
  58       for (SCM s = interesting_; scm_is_pair (s); s = scm_cdr (s))
  59         {
  60           if (i.grob ()->internal_has_interface (scm_car (s)))
  61             Hara_kiri_group_spanner::add_interesting_item (staffline_, i.grob ());
  62         }
  63     }
  64 }
  65
  66 Hara_kiri_engraver::Hara_kiri_engraver ()
  67 {
  68   interesting_ = SCM_EOL;
  69 }
  70
  71
  72 ADD_ACKNOWLEDGER(Hara_kiri_engraver, grob);
  73 ADD_TRANSLATOR (Hara_kiri_engraver,
  74                 /* descr */ "Like Axis_group_engraver, but make a hara-kiri spanner, and add "
  75                 "interesting items (ie. note heads, lyric syllables and normal rests) ",
  76                 /* creats*/ "RemoveEmptyVerticalGroup",
  77                 /* accepts */ "",
  78                 /* reads */ "keepAliveInterfaces",
  79                 /* write */ "");
  80