lily/cbeam-engraver.cc

   1 /*
   2   cbeam-engraver.cc --  implement Command_beam_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "cbeam-engraver.hh"
  11 #include "musical-request.hh"
  12 #include "beam.hh"
  13 #include "grouping.hh"
  14 #include "stem.hh"
  15 #include "warn.hh"
  16 #include "time-description.hh"
  17
  18 Command_beam_engraver::Command_beam_engraver ()
  19 {
  20   beam_p_ = 0;
  21   finished_beam_p_ =0;
  22   finished_grouping_p_ = 0;
  23   grouping_p_ =0;
  24   reqs_drul_[LEFT] = reqs_drul_[RIGHT] =0;
  25 }
  26
  27 bool
  28 Command_beam_engraver::do_try_music (Music *m)
  29 {
  30   if (Beam_req * c = dynamic_cast<Beam_req*>(m))
  31     {
  32       reqs_drul_[c->spantype_] = c;
  33       return true;
  34     }
  35   return false;
  36 }
  37
  38
  39 void
  40 Command_beam_engraver::do_process_requests ()
  41 {
  42   if (reqs_drul_[STOP])
  43     {
  44       if (!beam_p_)
  45         reqs_drul_[STOP]->warning (_("No beam to stop"));
  46       finished_beam_p_ = beam_p_;
  47       finished_grouping_p_ = grouping_p_;
  48
  49       beam_p_ = 0;
  50       grouping_p_ = 0;
  51     }
  52
  53   if (reqs_drul_[START])
  54     {
  55       beam_p_ = new Beam;
  56       grouping_p_ = new Rhythmic_grouping;
  57
  58       Scalar prop = get_property ("beamslopedamping");
  59       if (prop.isnum_b ())
  60         beam_p_->damping_i_ = prop;
  61
  62       prop = get_property ("beamquantisation");
  63       if (prop.isnum_b ())
  64         beam_p_->quantisation_ = (Beam::Quantisation)(int)prop;
  65
  66       announce_element (Score_element_info (beam_p_, reqs_drul_[START]));
  67     }
  68 }
  69
  70 void
  71 Command_beam_engraver::typeset_beam ()
  72 {
  73   if (finished_beam_p_)
  74     {
  75       Rhythmic_grouping const * rg_C = get_staff_info().rhythmic_C_;
  76       rg_C->extend (finished_grouping_p_->interval());
  77       finished_beam_p_->set_grouping (*rg_C, *finished_grouping_p_);
  78       typeset_element (finished_beam_p_);
  79       finished_beam_p_ = 0;
  80
  81       delete finished_grouping_p_;
  82       finished_grouping_p_= 0;
  83
  84       reqs_drul_[STOP] = 0;
  85     }
  86 }
  87
  88 void
  89 Command_beam_engraver::do_post_move_processing ()
  90 {
  91   reqs_drul_ [START] =0;
  92 }
  93
  94 void
  95 Command_beam_engraver::do_pre_move_processing ()
  96 {
  97   typeset_beam ();
  98 }
  99
 100 void
 101 Command_beam_engraver::do_removal_processing ()
 102 {
 103   typeset_beam ();
 104   finished_beam_p_ = beam_p_;
 105   finished_grouping_p_ = grouping_p_;
 106   typeset_beam ();
 107 }
 108
 109 void
 110 Command_beam_engraver::acknowledge_element (Score_element_info info)
 111 {
 112     if (beam_p_)
 113       {
 114         Stem* stem_l = dynamic_cast<Stem *> (info.elem_l_);
 115         if (!stem_l)
 116           return;
 117
 118
 119         Rhythmic_req *rhythmic_req = dynamic_cast <Rhythmic_req *> (info.req_l_);
 120         if (!rhythmic_req)
 121           {
 122             String s=_("Stem must have Rhythmic structure.");
 123             if (info.req_l_)
 124               info.req_l_->warning(s);
 125             else
 126               ::warning (s);
 127
 128             return;
 129           }
 130
 131
 132         if (rhythmic_req->duration_.durlog_i_<= 2)
 133           {
 134             rhythmic_req->warning (_ ("stem doesn't fit in beam"));
 135             return;
 136           }
 137
 138         /*
 139           TODO: do something sensible if it doesn't fit in the beam.
 140         */
 141         Moment start = get_staff_info().time_C_->whole_in_measure_;
 142
 143         if (!grouping_p_->child_fit_b (start))
 144           {
 145             String s (_("please fix me") + ": "
 146                       + _f ("stem at %s doesn't fit in beam", now_moment ().str ()));
 147
 148             if (info.req_l_)
 149               info.req_l_->warning(s);
 150             else
 151               warning (s);
 152           }
 153         else
 154           {
 155             grouping_p_->add_child (start, rhythmic_req->duration ());
 156             stem_l->flag_i_ = rhythmic_req->duration_.durlog_i_;
 157             beam_p_->add_stem (stem_l);
 158           }
 159       }
 160 }
 161
 162
 163
 164 ADD_THIS_TRANSLATOR(Command_beam_engraver);