--- /dev/null
+/*
+ This file is part of LilyPond, the GNU music typesetter.
+
+ Copyright (C) 2011 Mike Solomon <mike@apollinemike.com>
+
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "beam.hh"
+#include "engraver.hh"
+#include "item.hh"
+#include "note-head.hh"
+#include "pointer-group-interface.hh"
+#include "stem.hh"
+
+class Beam_collision_engraver : public Engraver
+{
+protected:
+ vector<Grob_info> beams_;
+ vector<Grob_info> covered_grobs_;
+
+ DECLARE_ACKNOWLEDGER (note_head);
+ DECLARE_ACKNOWLEDGER (stem);
+ DECLARE_ACKNOWLEDGER (accidental);
+ DECLARE_ACKNOWLEDGER (clef);
+ DECLARE_ACKNOWLEDGER (key_signature);
+ DECLARE_ACKNOWLEDGER (time_signature);
+ DECLARE_ACKNOWLEDGER (beam);
+
+ virtual void finalize ();
+
+private:
+ bool covered_grob_has_interface (Grob *covered_grob, Grob *beam);
+
+public:
+ TRANSLATOR_DECLARATIONS (Beam_collision_engraver);
+};
+
+Beam_collision_engraver::Beam_collision_engraver () {}
+
+bool
+Beam_collision_engraver::covered_grob_has_interface (Grob *covered_grob, Grob *beam)
+{
+ SCM interfaces = beam->get_property ("collision-interfaces");
+
+ for (SCM l = interfaces; scm_is_pair (l); l = scm_cdr (l))
+ {
+ if (covered_grob->internal_has_interface (scm_car (l)))
+ return true;
+ }
+
+ return false;
+}
+
+void
+Beam_collision_engraver::finalize ()
+{
+ if (!covered_grobs_.size ())
+ return;
+
+ vector_sort (covered_grobs_, Grob_info::less);
+ vector_sort (beams_, Grob_info::less);
+ vsize start = 0;
+
+ for (vsize i = 0; i < beams_.size (); i++)
+ {
+ Grob *beam_grob = beams_[i].grob ();
+
+ Context *beam_context = beams_[i].context ();
+
+ Interval_t<int> beam_spanned_rank_ = beam_grob->spanned_rank_interval ();
+ // Start considering grobs at the first grob whose end falls at or after the beam's beginning.
+ while (covered_grobs_[start].grob ()->spanned_rank_interval ()[RIGHT] < beam_spanned_rank_[LEFT])
+ start++;
+
+ // Stop when the grob's beginning comes after the beam's end.
+ for (vsize j = start; j < covered_grobs_.size (); j++)
+ {
+ Grob *covered_grob = covered_grobs_[j].grob ();
+ Context *covered_grob_context = covered_grobs_[j].context ();
+
+ Interval_t<int> covered_grob_spanned_rank = covered_grob->spanned_rank_interval ();
+ if (covered_grob_spanned_rank[LEFT] > beam_spanned_rank_[RIGHT])
+ break;
+ /*
+ Only consider grobs whose end falls at or after the beam's beginning.
+ If the grob is a beam, it cannot start before beams_[i].
+ Also, if the user wants to check for collisions only in the beam's voice,
+ then make sure the beam and the covered_grob are in the same voice.
+ */
+ if ((covered_grob_spanned_rank[RIGHT] >= beam_spanned_rank_[LEFT])
+ && !(to_boolean (beam_grob->get_property ("collision-voice-only"))
+ && (covered_grob_context != beam_context))
+ && !(Beam::has_interface (covered_grob)
+ && (covered_grob_spanned_rank[LEFT] <= beam_spanned_rank_[LEFT]))
+ && covered_grob_has_interface (covered_grob, beam_grob))
+ {
+ // Do not consider note heads attached to the beam.
+ if (Stem::has_interface (covered_grob))
+ if (unsmob_grob (covered_grob->get_object ("beam")))
+ continue;
+
+ if (Grob *stem = unsmob_grob (covered_grob->get_object ("stem")))
+ if (Grob *beam = unsmob_grob (stem->get_object ("beam")))
+ if (beam == beam_grob)
+ continue;
+
+ Pointer_group_interface::add_grob (beam_grob, ly_symbol2scm ("covered-grobs"), covered_grob);
+ }
+ }
+ }
+}
+
+void
+Beam_collision_engraver::acknowledge_note_head (Grob_info i)
+{
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_stem (Grob_info i)
+{
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_accidental (Grob_info i)
+{
+ if (i.grob ()->internal_has_interface (ly_symbol2scm ("inline-accidental-interface")))
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_clef (Grob_info i)
+{
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_key_signature (Grob_info i)
+{
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_time_signature (Grob_info i)
+{
+ covered_grobs_.push_back (i);
+}
+
+void
+Beam_collision_engraver::acknowledge_beam (Grob_info i)
+{
+ beams_.push_back (i);
+ covered_grobs_.push_back (i);
+}
+
+#include "translator.icc"
+
+ADD_ACKNOWLEDGER (Beam_collision_engraver, note_head);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, stem);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, accidental);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, clef);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, key_signature);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, time_signature);
+ADD_ACKNOWLEDGER (Beam_collision_engraver, beam);
+
+ADD_TRANSLATOR (Beam_collision_engraver,
+ /* doc */
+ "Help beams avoid colliding with notes and clefs in other voices.",
+
+ /* create */
+ "",
+
+ /* read */
+ "",
+
+ /* write */
+ ""
+ );
projects / lilypond.git / blobdiff