lily/meter-grav.cc

   1 /*
   2   meter-reg.cc -- implement Meter_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "meter-grav.hh"
  10 #include "meter.hh"
  11 #include "command-request.hh"
  12 #include "score-grav.hh"
  13
  14 Meter_engraver::Meter_engraver()
  15 {
  16     meter_req_l_ = 0;
  17     meter_p_ =0;
  18     default_grouping_ = Rhythmic_grouping(MInterval(0,4),4); // ugh
  19 }
  20
  21 void
  22 Meter_engraver::fill_staff_info(Staff_info&inf)
  23 {
  24     inf.time_C_ = &time_;
  25     inf.rhythmic_C_ = &default_grouping_;
  26 }
  27
  28 bool
  29 Meter_engraver::do_try_request(Request*r)
  30 {
  31     bool gotcha = false;
  32
  33     if (r->command() && r->command()->timing()) {
  34         gotcha = true;
  35         Timing_req * tr_l = r->command()->timing();
  36         Meter_change_req *m_l = tr_l->meterchange();
  37         if (m_l) {
  38             meter_req_l_ = m_l;
  39
  40             int b_i= m_l->beats_i_;
  41             int o_i = m_l->one_beat_i_;
  42             if (! time_.allow_meter_change_b() )
  43                 tr_l->warning("Meter change not allowed here");
  44             else{
  45                 time_.set_meter(b_i, o_i);
  46                 default_grouping_ =
  47                     Rhythmic_grouping(MInterval(0,Moment(b_i, o_i)), b_i);
  48             }
  49         } else if (tr_l->partial()) {
  50             Moment m = tr_l->partial()->duration_;
  51             String error = time_.try_set_partial_str(m);
  52             if (error != "") {
  53                 tr_l->warning(error);
  54             } else
  55                 time_.setpartial(m);
  56         } else if (tr_l->barcheck()) {
  57             if (time_.whole_in_measure_) {
  58                 tr_l ->warning( "Barcheck failed");
  59
  60                 time_.whole_in_measure_ = 0; // resync
  61                 time_.error_b_ = true;
  62             }
  63
  64         } else if (tr_l->cadenza()) {
  65             time_.set_cadenza(tr_l->cadenza()->on_b_);
  66
  67         } else if (tr_l->measuregrouping()) {
  68             default_grouping_ = parse_grouping(
  69                     tr_l->measuregrouping()->beat_i_arr_,
  70                     tr_l->measuregrouping()->elt_length_arr_);
  71
  72         }
  73     }
  74
  75     return gotcha;
  76 }
  77
  78 void
  79 Meter_engraver::do_creation_processing()
  80 {
  81     time_.when_ = get_staff_info().when();
  82 }
  83
  84 void
  85 Meter_engraver::do_process_requests()
  86 {
  87     if (meter_req_l_ ) {
  88         Array<Scalar> args;
  89         args.push(meter_req_l_->beats_i_);
  90         args.push(meter_req_l_->one_beat_i_);
  91
  92         meter_p_ = new Meter(args);
  93     }
  94
  95     if (meter_p_)
  96         announce_element(Score_elem_info(meter_p_, meter_req_l_) );
  97 }
  98
  99 void
 100 Meter_engraver::do_pre_move_processing()
 101 {
 102     if (meter_p_) {
 103         typeset_breakable_item(meter_p_);
 104         meter_p_ =0;
 105         meter_req_l_ = 0;
 106     }
 107
 108     Engraver_group_engraver * grav_l = daddy_grav_l_;
 109     while (grav_l->daddy_grav_l_) {
 110         grav_l = grav_l->daddy_grav_l_;
 111     }
 112
 113     assert( grav_l->name() == Score_engraver::static_name());
 114     if (!time_.cadenza_b_)
 115         ((Score_engraver*)grav_l)->add_moment_to_process( time_.next_bar_moment());
 116 }
 117
 118 void
 119 Meter_engraver::do_post_move_processing()
 120 {
 121     time_.add( get_staff_info().when()  - time_.when_ );
 122 }
 123
 124
 125 ADD_THIS_ENGRAVER(Meter_engraver);
 126 IMPLEMENT_IS_TYPE_B1(Meter_engraver,Engraver);