/* beam-engraver.cc -- implement Beam_engraver source file of the GNU LilyPond music typesetter (c) 1998--2003 Han-Wen Nienhuys */ #include "engraver-group-engraver.hh" #include "engraver.hh" #include "event.hh" #include "beam.hh" #include "stem.hh" #include "warn.hh" #include "beaming.hh" #include "score-engraver.hh" #include "rest.hh" #include "drul-array.hh" #include "item.hh" #include "spanner.hh" class Beam_engraver : public Engraver { protected: Drul_array evs_drul_; Spanner *finished_beam_; Spanner *beam_; Music * prev_start_ev_; Music * now_stop_ev_; Beaming_info_list * beam_info_; Beaming_info_list * finished_beam_info_; /// location within measure where beam started. Moment beam_start_location_; /// moment (global time) where beam started. Moment beam_start_mom_; bool subdivide_beams_; Moment beat_length_; void typeset_beam (); void set_melisma (bool); Moment last_stem_added_at_; virtual void stop_translation_timestep (); virtual void start_translation_timestep (); virtual void finalize (); virtual void acknowledge_grob (Grob_info); virtual bool try_music (Music*); virtual void process_music (); virtual bool valid_start_moment(); virtual bool valid_end_moment (); public: TRANSLATOR_DECLARATIONS( Beam_engraver ); }; /* Hmm. this isn't necessary, since grace beams and normal beams are always nested. */ bool Beam_engraver::valid_start_moment() { Moment n = now_mom (); return n.grace_part_ == Rational (0); } bool Beam_engraver::valid_end_moment() { return last_stem_added_at_.grace_part_ == Rational(0); } Beam_engraver::Beam_engraver () { beam_ = 0; finished_beam_ =0; finished_beam_info_=0; beam_info_ =0; now_stop_ev_ = 0; evs_drul_[LEFT] = evs_drul_[RIGHT] =0; prev_start_ev_ =0; } bool Beam_engraver::try_music (Music *m) { if (m->is_mus_type ("abort-event")) { evs_drul_[START] = 0; evs_drul_[STOP] = 0; if (beam_) beam_->suicide (); beam_ = 0; } else if (m->is_mus_type ("beam-event")) { Direction d = to_dir (m->get_mus_property ("span-direction")); if (d == START && !valid_start_moment ()) return false; if (d == STOP && !valid_end_moment ()) return false; if (d == START) evs_drul_[d] = m; else if (d==STOP) { now_stop_ev_ = m; } return true; } return false; } void Beam_engraver::set_melisma (bool m) { daddy_trans_->set_property ("beamMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F); } void Beam_engraver::process_music () { if (evs_drul_[STOP]) { prev_start_ev_ =0; finished_beam_ = beam_; finished_beam_info_ = beam_info_; beam_info_ =0; beam_ = 0; } if (beam_ && !to_boolean (get_property ("allowBeamBreak"))) { top_engraver ()->forbid_breaks (); } if (evs_drul_[START]) { if (beam_) { evs_drul_[START]->origin ()->warning (_ ("already have a beam")); return; } prev_start_ev_ = evs_drul_[START]; beam_ = new Spanner (get_property ("Beam")); SCM smp = get_property ("measurePosition"); Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0); beam_start_location_ = mp; beam_start_mom_ = now_mom (); beam_info_ = new Beaming_info_list; /* urg, must copy to Auto_beam_engraver too */ announce_grob(beam_, evs_drul_[START]->self_scm()); } } void Beam_engraver::typeset_beam () { if (finished_beam_) { finished_beam_info_->beamify(beat_length_, subdivide_beams_); Beam::set_beaming (finished_beam_, finished_beam_info_); typeset_grob (finished_beam_); delete finished_beam_info_; finished_beam_info_ =0; finished_beam_ = 0; } } void Beam_engraver::start_translation_timestep () { evs_drul_ [START] =0; evs_drul_[STOP] = 0; if (beam_) { SCM m = get_property ("automaticMelismata"); SCM b = get_property ("autoBeaming"); if (to_boolean (m) && !to_boolean (b)) { set_melisma (true); } subdivide_beams_ = to_boolean(get_property("subdivideBeams")); beat_length_ = *unsmob_moment (get_property ("beatLength")); } } void Beam_engraver::stop_translation_timestep () { typeset_beam (); if (now_stop_ev_ ) { finished_beam_ = beam_; finished_beam_info_ = beam_info_; now_stop_ev_ = 0; beam_ = 0; beam_info_ = 0; typeset_beam(); if (to_boolean (get_property ("automaticMelismata")) && !to_boolean (get_property ("autoBeaming"))) { set_melisma (false); } } } void Beam_engraver::finalize () { typeset_beam (); if (beam_) { prev_start_ev_->origin ()->warning (_ ("unterminated beam")); /* we don't typeset it, (we used to, but it was commented out. Reason unknown) */ beam_->suicide (); delete beam_info_; } } void Beam_engraver::acknowledge_grob (Grob_info info) { if (beam_) { if (Rest::has_interface (info.grob_)) { info.grob_->add_offset_callback (Beam::rest_collision_callback_proc, Y_AXIS); } else if (Stem::has_interface (info.grob_)) { Moment now = now_mom(); if (!valid_start_moment ()) return ; Item *stem = dynamic_cast (info.grob_); if (Stem::get_beam (stem)) return; Music* m = info.music_cause(); if (!m->is_mus_type ("rhythmic-event")) { String s = _ ("stem must have Rhythmic structure"); if (info.music_cause ()) info.music_cause ()->origin ()->warning (s); else ::warning (s); return; } last_stem_added_at_ = now; int durlog = unsmob_duration (m->get_mus_property ("duration"))-> duration_log (); if (durlog <= 2) { m->origin ()->warning (_ ("stem doesn't fit in beam")); prev_start_ev_->origin ()->warning (_ ("beam was started here")); /* don't return, since [r4 c8] can just as well be modern notation. */ } stem->set_grob_property ("duration-log", scm_int2num (durlog)); Moment stem_location = now - beam_start_mom_ + beam_start_location_; beam_info_->add_stem (stem_location, (durlog- 2) >? 0); Beam::add_stem (beam_, stem); } } } ENTER_DESCRIPTION(Beam_engraver, /* descr */ "Handles Beam events by engraving Beams. If omitted, then notes will be " "printed with flags instead of beams.", /* creats*/ "Beam", /* accepts */ "beam-event abort-event", /* acks */ "stem-interface rest-interface", /* reads */ "beamMelismaBusy beatLength subdivideBeams", /* write */ ""); class Grace_beam_engraver : public Beam_engraver { public: TRANSLATOR_DECLARATIONS(Grace_beam_engraver); protected: virtual bool valid_start_moment(); virtual bool valid_end_moment (); }; Grace_beam_engraver::Grace_beam_engraver() { } bool Grace_beam_engraver::valid_start_moment() { Moment n = now_mom (); return n.grace_part_ != Rational (0); } bool Grace_beam_engraver::valid_end_moment () { return beam_ && last_stem_added_at_.grace_part_ != Rational(0); } ENTER_DESCRIPTION(Grace_beam_engraver, /* descr */ "Handles Beam events by engraving Beams. If omitted, then notes will " "be printed with flags instead of beams. Only engraves beams when we " " are at grace points in time. " , /* creats*/ "Beam", /* accepts */ "beam-event abort-event", /* acks */ "stem-interface rest-interface", /* reads */ "beamMelismaBusy beatLength allowBeamBreak subdivideBeams", /* write */ "");