lily/cluster-engraver.cc

   1 /*
   2   cluster-engraver.cc -- implement Cluster_engraver
   3
   4   (c) 2002--2003 Juergen Reuter <reuter@ipd.uka.de>
   5
   6   Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "item.hh"
  11 #include "spanner.hh"
  12 #include "note-head.hh"
  13 #include "protected-scm.hh"
  14 #include "warn.hh"
  15 #include "note-column.hh"
  16 #include "group-interface.hh"
  17
  18 class Cluster_engraver : public Engraver
  19 {
  20
  21 protected:
  22 TRANSLATOR_DECLARATIONS(Cluster_engraver);
  23   virtual bool try_music (Music *);
  24   virtual void process_music ();
  25   virtual void acknowledge_grob (Grob_info);
  26   virtual void stop_translation_timestep ();
  27
  28 private:
  29   Drul_array<Music*> reqs_drul_;
  30
  31   Spanner *cluster_;
  32 };
  33
  34 Cluster_engraver::Cluster_engraver ()
  35 {
  36   cluster_ = 0;
  37   reqs_drul_[LEFT] = reqs_drul_[RIGHT] = 0;
  38 }
  39
  40 bool
  41 Cluster_engraver::try_music (Music *m)
  42 {
  43   if (m->is_mus_type ("abort-event"))
  44     {
  45       reqs_drul_[START] = 0;
  46       reqs_drul_[STOP] = 0;
  47       if (cluster_)
  48         {
  49           cluster_->suicide ();
  50           cluster_ = 0;
  51         }
  52     }
  53   else if (m->is_mus_type ("cluster-event"))
  54     {
  55       Direction d = to_dir (m->get_mus_property ("span-direction"));
  56
  57       reqs_drul_[d] = m;
  58       return true;
  59     }
  60   return false;
  61 }
  62
  63 void
  64 Cluster_engraver::process_music ()
  65 {
  66   if (reqs_drul_[STOP])
  67     {
  68       if (!cluster_)
  69         {
  70           reqs_drul_[STOP]->origin ()->warning ("can't find start of cluster");
  71         }
  72       else
  73         {
  74           Grob *bound = unsmob_grob (get_property ("currentMusicalColumn"));
  75           cluster_->set_bound (RIGHT, bound);
  76         }
  77     }
  78   if (reqs_drul_[START])
  79     {
  80       if (cluster_)
  81         {
  82           reqs_drul_[START]->origin ()->warning ("may not nest clusters");
  83         }
  84       else
  85         {
  86           cluster_ = new Spanner (get_property ("Cluster"));
  87           Grob *bound = unsmob_grob (get_property ("currentMusicalColumn"));
  88           cluster_->set_bound (LEFT, bound);
  89           announce_grob (cluster_, reqs_drul_[START]->self_scm ());
  90         }
  91       reqs_drul_[START] = 0;
  92     }
  93 }
  94
  95
  96 void
  97 Cluster_engraver::stop_translation_timestep ()
  98 {
  99   if (reqs_drul_[STOP])
 100     {
 101       reqs_drul_[STOP] = 0;
 102       typeset_grob (cluster_);
 103       cluster_ = 0;
 104     }
 105 }
 106
 107 void
 108 Cluster_engraver::acknowledge_grob (Grob_info info)
 109 {
 110   if (cluster_ && Note_column::has_interface (info.grob_))
 111     {
 112       Pointer_group_interface::add_grob (cluster_, ly_symbol2scm ("columns"), info.grob_);
 113     }
 114 }
 115
 116 ENTER_DESCRIPTION(Cluster_engraver,
 117 /* descr */     "engraves a cluster",
 118 /* creats*/     "Cluster",
 119 /* accepts */   "cluster-event",
 120 /* acks  */     "note-column-interface",
 121 /* reads */     "",
 122 /* write */     "");