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--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7            Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "duration-convert.hh"
  11 #include "timing-translator.hh"
  12 #include "chord-tremolo-engraver.hh"
  13 #include "stem.hh"
  14 #include "beam.hh"
  15 #include "musical-request.hh"
  16 #include "misc.hh"
  17 #include "warn.hh"
  18 #include "score-engraver.hh"
  19
  20 ADD_THIS_TRANSLATOR (Chord_tremolo_engraver);
  21
  22 Chord_tremolo_engraver::Chord_tremolo_engraver ()
  23 {
  24   reqs_drul_[LEFT] = reqs_drul_[RIGHT] = 0;
  25   abeam_p_ = 0;
  26   finished_abeam_p_ = 0;
  27   prev_start_req_ = 0;
  28 }
  29
  30 bool
  31 Chord_tremolo_engraver::do_try_music (Music* m)
  32 {
  33   if (Chord_tremolo_req* b = dynamic_cast <Chord_tremolo_req *> (m))
  34     {
  35       Direction d = b->span_dir_;
  36       if (reqs_drul_[d] && !reqs_drul_[d]->equal_b (b))
  37         return false;
  38
  39       if ((d == STOP) && !abeam_p_)
  40         {
  41           m->warning (_ ("no tremolo beam to end"));
  42           return false;
  43         }
  44
  45       reqs_drul_[d] = b;
  46       return true;
  47     }
  48
  49   return false;
  50 }
  51
  52 void
  53 Chord_tremolo_engraver::do_process_requests ()
  54 {
  55   if (reqs_drul_[STOP])
  56     {
  57       if (!abeam_p_)
  58         reqs_drul_[STOP]->warning (_ ("no tremolo beam to end"));
  59       prev_start_req_ = 0;
  60       finished_abeam_p_ = abeam_p_;
  61       abeam_p_ = 0;
  62     }
  63
  64   if (abeam_p_)
  65     {
  66       Score_engraver * e = 0;
  67       Translator * t  =  daddy_grav_l ();
  68       for (; !e && t;  t = t->daddy_trans_l_)
  69         {
  70           e = dynamic_cast<Score_engraver*> (t);
  71         }
  72
  73       if (!e)
  74         programming_error ("No score engraver!");
  75       else
  76         e->forbid_breaks ();
  77     }
  78
  79   if (reqs_drul_[START])
  80     {
  81       if (abeam_p_)
  82         {
  83           reqs_drul_[START]->warning (_ ("Already have a tremolo beam"));
  84           return;
  85         }
  86
  87       prev_start_req_ = reqs_drul_[START];
  88
  89       abeam_p_ = new Beam;
  90       abeam_p_->set_elt_property ("chord-tremolo", SCM_BOOL_T);
  91
  92       announce_element (Score_element_info (abeam_p_, reqs_drul_[LEFT]));
  93   }
  94 }
  95
  96 void
  97 Chord_tremolo_engraver::do_post_move_processing ()
  98 {
  99   reqs_drul_ [START] = 0;
 100 }
 101
 102 void
 103 Chord_tremolo_engraver::do_pre_move_processing ()
 104 {
 105   typeset_beam ();
 106 }
 107
 108 void
 109 Chord_tremolo_engraver::typeset_beam ()
 110 {
 111   if (finished_abeam_p_)
 112     {
 113       typeset_element (finished_abeam_p_);
 114       finished_abeam_p_ = 0;
 115
 116       reqs_drul_[STOP] = 0;
 117     }
 118 }
 119
 120 void
 121 Chord_tremolo_engraver::do_removal_processing ()
 122 {
 123   typeset_beam ();
 124   if (abeam_p_)
 125     {
 126       prev_start_req_->warning (_ ("unfinished tremolo beam"));
 127       finished_abeam_p_ = abeam_p_;
 128       typeset_beam ();
 129     }
 130 }
 131
 132 void
 133 Chord_tremolo_engraver::acknowledge_element (Score_element_info i)
 134 {
 135   if (abeam_p_)
 136     {
 137       if (Stem* s = dynamic_cast<Stem *> (i.elem_l_))
 138         {
 139           int type_i = prev_start_req_->type_i_;
 140           s->set_elt_property ("duration-log",  gh_int2scm (intlog2 (type_i) - 2));
 141
 142           s->set_beaming (s->flag_i (), LEFT);
 143           s->set_beaming ( s->flag_i (), RIGHT);
 144
 145
 146 #if 0
 147           if (s->type_i () != 1)
 148             {
 149               int gap_i =s->flag_i () - ((s->type_i () >? 2) - 2);
 150               s->set_elt_property ("beam-gap", gh_int2scm(gap_i));
 151             }
 152 #else
 153           if (s->type_i () != 1)
 154             {
 155               int gap_i =s->flag_i () - ((s->type_i () >? 2) - 2);
 156               abeam_p_->set_elt_property ("beam-gap", gh_int2scm(gap_i));
 157             }
 158 #endif
 159
 160           abeam_p_->add_stem (s);
 161         }
 162     }
 163 }
 164