lily/cluster-engraver.cc

   1 /*
   2   cluster-engraver.cc -- implement Cluster_engraver
   3
   4   (c) 2002--2009 Juergen Reuter <reuter@ipd.uka.de>
   5
   6   Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "spanner.hh"
  11 #include "note-head.hh"
  12 #include "note-column.hh"
  13 #include "pointer-group-interface.hh"
  14 #include "pitch.hh"
  15 #include "stream-event.hh"
  16 #include "item.hh"
  17
  18 #include "translator.icc"
  19
  20 class Cluster_spanner_engraver : public Engraver
  21 {
  22
  23 protected:
  24   TRANSLATOR_DECLARATIONS (Cluster_spanner_engraver);
  25   DECLARE_TRANSLATOR_LISTENER (cluster_note);
  26   DECLARE_ACKNOWLEDGER (note_column);
  27   void stop_translation_timestep ();
  28   virtual void process_music ();
  29   virtual void finalize ();
  30 private:
  31   vector<Stream_event*> cluster_notes_;
  32   Item *beacon_;
  33
  34   void typeset_grobs ();
  35   Spanner *spanner_;
  36   Spanner *finished_spanner_;
  37 };
  38
  39 Cluster_spanner_engraver::Cluster_spanner_engraver ()
  40 {
  41   spanner_ = 0;
  42   finished_spanner_ = 0;
  43   beacon_ = 0;
  44 }
  45
  46 void
  47 Cluster_spanner_engraver::finalize ()
  48 {
  49   typeset_grobs ();
  50   finished_spanner_ = spanner_;
  51   spanner_ = 0;
  52   typeset_grobs ();
  53 }
  54
  55 void
  56 Cluster_spanner_engraver::typeset_grobs ()
  57 {
  58   if (finished_spanner_)
  59     {
  60       if (!finished_spanner_->get_bound (RIGHT))
  61         {
  62           finished_spanner_->set_bound (RIGHT,
  63                                         finished_spanner_->get_bound (LEFT));
  64
  65         }
  66
  67       finished_spanner_ = 0;
  68     }
  69   beacon_ = 0;
  70 }
  71
  72 IMPLEMENT_TRANSLATOR_LISTENER (Cluster_spanner_engraver, cluster_note);
  73 void
  74 Cluster_spanner_engraver::listen_cluster_note (Stream_event *ev)
  75 {
  76   cluster_notes_.push_back (ev);
  77 }
  78
  79 void
  80 Cluster_spanner_engraver::process_music ()
  81 {
  82   if (cluster_notes_.size ())
  83     {
  84       SCM c0scm = get_property ("middleCPosition");
  85
  86       int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
  87       int pmax = INT_MIN;
  88       int pmin = INT_MAX;
  89
  90       for (vsize i = 0; i < cluster_notes_.size (); i++)
  91         {
  92           Pitch *pit = unsmob_pitch (cluster_notes_[i]->get_property ("pitch"));
  93
  94           int p = (pit ? pit->steps () : 0) + c0;
  95
  96           pmax = max (pmax, p);
  97           pmin = min (pmin, p);
  98         }
  99
 100       beacon_ = make_item ("ClusterSpannerBeacon", cluster_notes_[0]->self_scm ());
 101       beacon_->set_property ("positions",
 102                              scm_cons (scm_from_int (pmin),
 103                                        scm_from_int (pmax)));
 104     }
 105
 106   if (beacon_ && !spanner_)
 107     spanner_ = make_spanner ("ClusterSpanner", cluster_notes_[0]->self_scm ());
 108
 109   if (beacon_ && spanner_)
 110     {
 111       add_bound_item (spanner_, beacon_);
 112       Pointer_group_interface::add_grob (spanner_, ly_symbol2scm ("columns"), beacon_);
 113     }
 114 }
 115
 116 void
 117 Cluster_spanner_engraver::stop_translation_timestep ()
 118 {
 119   typeset_grobs ();
 120   cluster_notes_.clear ();
 121 }
 122
 123 void
 124 Cluster_spanner_engraver::acknowledge_note_column (Grob_info info)
 125 {
 126   if (!beacon_ && Note_column::has_interface (info.grob ()))
 127     {
 128       finished_spanner_ = spanner_;
 129       spanner_ = 0;
 130     }
 131 }
 132
 133 ADD_ACKNOWLEDGER (Cluster_spanner_engraver, note_column);
 134 ADD_TRANSLATOR (Cluster_spanner_engraver,
 135                 /* doc */
 136                 "Engrave a cluster using @code{Spanner} notation.",
 137
 138                 /* create */
 139                 "ClusterSpanner "
 140                 "ClusterSpannerBeacon ",
 141
 142                 /* read */
 143                 "",
 144
 145                 /* write */
 146                 ""
 147                 );
 148