lily/cluster-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2011 Juergen Reuter <reuter@ipd.uka.de>
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "engraver.hh"
  22 #include "spanner.hh"
  23 #include "note-head.hh"
  24 #include "note-column.hh"
  25 #include "pointer-group-interface.hh"
  26 #include "pitch.hh"
  27 #include "stream-event.hh"
  28 #include "item.hh"
  29
  30 #include "translator.icc"
  31
  32 class Cluster_spanner_engraver : public Engraver
  33 {
  34
  35 protected:
  36   TRANSLATOR_DECLARATIONS (Cluster_spanner_engraver);
  37   DECLARE_TRANSLATOR_LISTENER (cluster_note);
  38   DECLARE_ACKNOWLEDGER (note_column);
  39   void stop_translation_timestep ();
  40   virtual void process_music ();
  41   virtual void finalize ();
  42 private:
  43   vector<Stream_event*> cluster_notes_;
  44   Item *beacon_;
  45
  46   void typeset_grobs ();
  47   Spanner *spanner_;
  48   Spanner *finished_spanner_;
  49 };
  50
  51 Cluster_spanner_engraver::Cluster_spanner_engraver ()
  52 {
  53   spanner_ = 0;
  54   finished_spanner_ = 0;
  55   beacon_ = 0;
  56 }
  57
  58 void
  59 Cluster_spanner_engraver::finalize ()
  60 {
  61   typeset_grobs ();
  62   finished_spanner_ = spanner_;
  63   spanner_ = 0;
  64   typeset_grobs ();
  65 }
  66
  67 void
  68 Cluster_spanner_engraver::typeset_grobs ()
  69 {
  70   if (finished_spanner_)
  71     {
  72       if (!finished_spanner_->get_bound (RIGHT))
  73         {
  74           finished_spanner_->set_bound (RIGHT,
  75                                         finished_spanner_->get_bound (LEFT));
  76
  77         }
  78
  79       finished_spanner_ = 0;
  80     }
  81   beacon_ = 0;
  82 }
  83
  84 IMPLEMENT_TRANSLATOR_LISTENER (Cluster_spanner_engraver, cluster_note);
  85 void
  86 Cluster_spanner_engraver::listen_cluster_note (Stream_event *ev)
  87 {
  88   cluster_notes_.push_back (ev);
  89 }
  90
  91 void
  92 Cluster_spanner_engraver::process_music ()
  93 {
  94   if (cluster_notes_.size ())
  95     {
  96       SCM c0scm = get_property ("middleCPosition");
  97
  98       int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
  99       int pmax = INT_MIN;
 100       int pmin = INT_MAX;
 101
 102       for (vsize i = 0; i < cluster_notes_.size (); i++)
 103         {
 104           Pitch *pit = unsmob_pitch (cluster_notes_[i]->get_property ("pitch"));
 105
 106           int p = (pit ? pit->steps () : 0) + c0;
 107
 108           pmax = max (pmax, p);
 109           pmin = min (pmin, p);
 110         }
 111
 112       beacon_ = make_item ("ClusterSpannerBeacon", cluster_notes_[0]->self_scm ());
 113       beacon_->set_property ("positions",
 114                              scm_cons (scm_from_int (pmin),
 115                                        scm_from_int (pmax)));
 116     }
 117
 118   if (beacon_ && !spanner_)
 119     spanner_ = make_spanner ("ClusterSpanner", cluster_notes_[0]->self_scm ());
 120
 121   if (beacon_ && spanner_)
 122     {
 123       add_bound_item (spanner_, beacon_);
 124       Pointer_group_interface::add_grob (spanner_, ly_symbol2scm ("columns"), beacon_);
 125     }
 126 }
 127
 128 void
 129 Cluster_spanner_engraver::stop_translation_timestep ()
 130 {
 131   typeset_grobs ();
 132   cluster_notes_.clear ();
 133 }
 134
 135 void
 136 Cluster_spanner_engraver::acknowledge_note_column (Grob_info info)
 137 {
 138   if (!beacon_ && Note_column::has_interface (info.grob ()))
 139     {
 140       finished_spanner_ = spanner_;
 141       spanner_ = 0;
 142     }
 143 }
 144
 145 ADD_ACKNOWLEDGER (Cluster_spanner_engraver, note_column);
 146 ADD_TRANSLATOR (Cluster_spanner_engraver,
 147                 /* doc */
 148                 "Engrave a cluster using @code{Spanner} notation.",
 149
 150                 /* create */
 151                 "ClusterSpanner "
 152                 "ClusterSpannerBeacon ",
 153
 154                 /* read */
 155                 "",
 156
 157                 /* write */
 158                 ""
 159                 );
 160