lily/cluster-engraver.cc

   1 /*
   2   cluster-engraver.cc -- implement Cluster_engraver
   3
   4   (c) 2002--2004 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 "note-column.hh"
  14 #include "group-interface.hh"
  15
  16 class Cluster_spanner_engraver : public Engraver
  17 {
  18
  19 protected:
  20   TRANSLATOR_DECLARATIONS (Cluster_spanner_engraver);
  21   virtual bool try_music (Music *);
  22   virtual void process_music ();
  23   virtual void acknowledge_grob (Grob_info);
  24   virtual void stop_translation_timestep ();
  25   virtual void finalize ();
  26 private:
  27   Link_array<Music> cluster_notes_;
  28   Item* beacon_;
  29
  30   void typeset_grobs ();
  31   Spanner *spanner_;
  32   Spanner * finished_spanner_ ;
  33 };
  34
  35 Cluster_spanner_engraver::Cluster_spanner_engraver ()
  36 {
  37   spanner_ = 0;
  38   finished_spanner_ = 0;
  39   beacon_ = 0;
  40 }
  41
  42 void
  43 Cluster_spanner_engraver::finalize ()
  44 {
  45   typeset_grobs ();
  46   finished_spanner_ = spanner_;
  47   spanner_ = 0;
  48   typeset_grobs ();
  49 }
  50
  51 void
  52 Cluster_spanner_engraver::typeset_grobs ()
  53 {
  54   finished_spanner_ = 0;
  55   beacon_ = 0;
  56 }
  57
  58 bool
  59 Cluster_spanner_engraver::try_music (Music *m)
  60 {
  61   if (m->is_mus_type ("cluster-note-event"))
  62     {
  63       cluster_notes_.push (m);
  64       return true;
  65     }
  66   return false;
  67 }
  68
  69 void
  70 Cluster_spanner_engraver::process_music ()
  71 {
  72   if (cluster_notes_.size ())
  73     {
  74       SCM c0scm = get_property ("middleCPosition");
  75
  76       int c0 =  ly_c_number_p (c0scm) ? ly_scm2int (c0scm) : 0;
  77       int pmax = INT_MIN;
  78       int pmin = INT_MAX;
  79
  80       for (int i = 0; i <cluster_notes_.size (); i++)
  81         {
  82           Pitch *pit =unsmob_pitch (cluster_notes_[i]->get_property ("pitch"));
  83
  84           int p =( pit ? pit->steps () : 0) + c0;
  85
  86           pmax = pmax >? p;
  87           pmin = pmin <? p;
  88         }
  89
  90       beacon_ = make_item ("ClusterSpannerBeacon", cluster_notes_[0]->self_scm ());
  91       beacon_->set_property ("positions",
  92                                   scm_cons (scm_int2num (pmin),
  93                                             scm_int2num (pmax)));
  94     }
  95
  96   if (beacon_ && !spanner_)
  97     {
  98       spanner_ = make_spanner ("ClusterSpanner", cluster_notes_[0]->self_scm () );
  99     }
 100
 101   if (beacon_ && spanner_)
 102     {
 103       add_bound_item (spanner_, beacon_);
 104       Pointer_group_interface::add_grob (spanner_, ly_symbol2scm ("columns"), beacon_);
 105     }
 106 }
 107
 108
 109 void
 110 Cluster_spanner_engraver::stop_translation_timestep ()
 111 {
 112   typeset_grobs ();
 113
 114   cluster_notes_.clear ();
 115
 116 }
 117
 118 void
 119 Cluster_spanner_engraver::acknowledge_grob (Grob_info info)
 120 {
 121   if (!beacon_ && Note_column::has_interface (info.grob_))
 122     {
 123       finished_spanner_ = spanner_;
 124       spanner_ = 0;
 125     }
 126 }
 127
 128 ENTER_DESCRIPTION (Cluster_spanner_engraver,
 129 /* descr */     "Engraves a cluster using Spanner notation ",
 130 /* creats*/     "ClusterSpanner ClusterSpannerBeacon",
 131 /* accepts */   "cluster-note-event",
 132 /* acks  */     "note-column-interface",
 133 /* reads */     "",
 134 /* write */     "");
 135