lily/chord-tremolo-engraver.cc

   1 /*
   2   chord-tremolo-engraver.cc -- implement Chord_tremolo_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7            Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "timing-translator.hh"
  11 #include "chord-tremolo-engraver.hh"
  12 #include "stem.hh"
  13 #include "beam.hh"
  14 #include "musical-request.hh"
  15 #include "misc.hh"
  16 #include "warn.hh"
  17 #include "score-engraver.hh"
  18
  19 ADD_THIS_TRANSLATOR (Chord_tremolo_engraver);
  20
  21 Chord_tremolo_engraver::Chord_tremolo_engraver ()
  22 {
  23   reqs_drul_[LEFT] = reqs_drul_[RIGHT] = 0;
  24   abeam_p_ = 0;
  25   finished_abeam_p_ = 0;
  26   prev_start_req_ = 0;
  27 }
  28
  29 bool
  30 Chord_tremolo_engraver::do_try_music (Music* m)
  31 {
  32   if (Chord_tremolo_req* b = dynamic_cast <Chord_tremolo_req *> (m))
  33     {
  34       Direction d = b->span_dir_;
  35       if (reqs_drul_[d] && !reqs_drul_[d]->equal_b (b))
  36         return false;
  37
  38       if ((d == STOP) && !abeam_p_)
  39         {
  40           m->warning (_ ("no tremolo beam to end"));
  41           return false;
  42         }
  43
  44       reqs_drul_[d] = b;
  45       return true;
  46     }
  47
  48   return false;
  49 }
  50
  51 void
  52 Chord_tremolo_engraver::do_process_requests ()
  53 {
  54   if (reqs_drul_[STOP])
  55     {
  56       if (!abeam_p_)
  57         reqs_drul_[STOP]->warning (_ ("no tremolo beam to end"));
  58       prev_start_req_ = 0;
  59       finished_abeam_p_ = abeam_p_;
  60       abeam_p_ = 0;
  61     }
  62
  63   if (abeam_p_)
  64     {
  65       Score_engraver * e = 0;
  66       Translator * t  =  daddy_grav_l ();
  67       for (; !e && t;  t = t->daddy_trans_l_)
  68         {
  69           e = dynamic_cast<Score_engraver*> (t);
  70         }
  71
  72       if (!e)
  73         programming_error ("No score engraver!");
  74       else
  75         e->forbid_breaks ();
  76     }
  77
  78   if (reqs_drul_[START])
  79     {
  80       if (abeam_p_)
  81         {
  82           reqs_drul_[START]->warning (_ ("Already have a tremolo beam"));
  83           return;
  84         }
  85
  86       prev_start_req_ = reqs_drul_[START];
  87
  88       abeam_p_ = new Beam;
  89       abeam_p_->set_elt_property ("chord-tremolo", SCM_BOOL_T);
  90
  91       announce_element (Score_element_info (abeam_p_, reqs_drul_[LEFT]));
  92   }
  93 }
  94
  95 void
  96 Chord_tremolo_engraver::do_post_move_processing ()
  97 {
  98   reqs_drul_ [START] = 0;
  99 }
 100
 101 void
 102 Chord_tremolo_engraver::do_pre_move_processing ()
 103 {
 104   typeset_beam ();
 105 }
 106
 107 void
 108 Chord_tremolo_engraver::typeset_beam ()
 109 {
 110   if (finished_abeam_p_)
 111     {
 112       typeset_element (finished_abeam_p_);
 113       finished_abeam_p_ = 0;
 114
 115       reqs_drul_[STOP] = 0;
 116     }
 117 }
 118
 119 void
 120 Chord_tremolo_engraver::do_removal_processing ()
 121 {
 122   typeset_beam ();
 123   if (abeam_p_)
 124     {
 125       prev_start_req_->warning (_ ("unfinished tremolo beam"));
 126       finished_abeam_p_ = abeam_p_;
 127       typeset_beam ();
 128     }
 129 }
 130
 131 void
 132 Chord_tremolo_engraver::acknowledge_element (Score_element_info i)
 133 {
 134   if (abeam_p_)
 135     {
 136       if (Stem* s = dynamic_cast<Stem *> (i.elem_l_))
 137         {
 138           int type_i = prev_start_req_->type_i_;
 139           s->set_elt_property ("duration-log",  gh_int2scm (intlog2 (type_i) - 2));
 140
 141           s->set_beaming (s->flag_i (), LEFT);
 142           s->set_beaming ( s->flag_i (), RIGHT);
 143
 144
 145 #if 0
 146           if (s->type_i () != 1)
 147             {
 148               int gap_i =s->flag_i () - ((s->type_i () >? 2) - 2);
 149               s->set_elt_property ("beam-gap", gh_int2scm(gap_i));
 150             }
 151 #else
 152           if (s->type_i () != 1)
 153             {
 154               int gap_i =s->flag_i () - ((s->type_i () >? 2) - 2);
 155               abeam_p_->set_elt_property ("beam-gap", gh_int2scm(gap_i));
 156             }
 157 #endif
 158
 159           abeam_p_->add_stem (s);
 160         }
 161     }
 162 }
 163