lily/stem-engraver.cc

   1 /*
   2   stem-grav.cc -- implement Stem_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "staff-symbol-referencer.hh"
  10 #include "rhythmic-head.hh"
  11 #include "stem.hh"
  12 #include "musical-request.hh"
  13 #include "misc.hh"
  14 #include "stem-tremolo.hh"
  15 #include "item.hh"
  16 #include "translator-group.hh"
  17 #include "engraver.hh"
  18
  19 /**
  20   Make stems upon receiving noteheads.
  21  */
  22 class Stem_engraver : public Engraver
  23 {
  24
  25 public:
  26   VIRTUAL_COPY_CONS (Translator);
  27   Stem_engraver ();
  28
  29 protected:
  30   virtual void acknowledge_grob (Grob_info);
  31   virtual void stop_translation_timestep ();
  32   virtual bool try_music (Music*);
  33
  34 private:
  35   Grob  *stem_p_;
  36   Grob *tremolo_p_;
  37   Rhythmic_req *rhythmic_req_l_;
  38   Tremolo_req* tremolo_req_l_;
  39 };
  40
  41 ADD_THIS_TRANSLATOR (Stem_engraver);
  42
  43 Stem_engraver::Stem_engraver ()
  44 {
  45   tremolo_req_l_ = 0;
  46   stem_p_ = 0;
  47   tremolo_p_ = 0;
  48   rhythmic_req_l_ =0;
  49 }
  50
  51
  52 void
  53 Stem_engraver::acknowledge_grob (Grob_info i)
  54 {
  55   Grob* h = i.elem_l_;
  56   if (Rhythmic_head::has_interface (h))
  57     {
  58       if (Rhythmic_head::stem_l (h))
  59         return;
  60
  61       int duration_log  = unsmob_duration (i.req_l_->get_mus_property ("duration"))-> duration_log ();
  62
  63       if (!stem_p_)
  64         {
  65           stem_p_ = new Item (get_property ("Stem"));
  66           Stem::set_interface (stem_p_);
  67           Staff_symbol_referencer::set_interface (stem_p_);
  68
  69
  70           stem_p_->set_grob_property ("duration-log", gh_int2scm (duration_log));
  71
  72           if (tremolo_req_l_)
  73             {
  74               /*
  75                 Stem tremolo is never applied to a note by default,
  76                 is must me requested.  But there is a default for the
  77                 tremolo value:
  78
  79                    c4:8 c c:
  80
  81                 the first and last (quarter) note bothe get one tremolo flag.
  82                */
  83               int requested_type = gh_scm2int (tremolo_req_l_->get_mus_property ("tremolo-type"));
  84
  85               SCM f = get_property ("tremoloFlags");
  86               if (!requested_type && gh_number_p (f))
  87                 requested_type = gh_scm2int (f);
  88               else
  89                 daddy_trans_l_->set_property ("tremoloFlags", gh_int2scm (requested_type));
  90
  91               if (requested_type)
  92                 {
  93                   tremolo_p_ = new Item (get_property ("StemTremolo"));
  94                   Stem_tremolo::set_interface (tremolo_p_);
  95
  96                   announce_grob (tremolo_p_, tremolo_req_l_);
  97                   /*
  98                     The number of tremolo flags is the number of flags of
  99                     the tremolo-type minus the number of flags of the note
 100                     itself.
 101                    */
 102                   int tremolo_flags = intlog2 (requested_type) - 2
 103                     - (duration_log > 2 ? duration_log - 2 : 0);
 104                   if (tremolo_flags < 0)
 105                     tremolo_flags = 0;
 106                   tremolo_p_->set_grob_property ("tremolo-flags",
 107                                                 gh_int2scm (tremolo_flags));
 108                 }
 109             }
 110           announce_grob (stem_p_, i.req_l_);
 111         }
 112
 113       if (Stem::flag_i (stem_p_) != duration_log)
 114         {
 115           i.req_l_->origin ()->warning (_f ("Adding note head to incompatible stem (type = %d)", 1 <<  Stem::flag_i (stem_p_)));
 116         }
 117
 118       Stem::add_head (stem_p_,h);
 119     }
 120 }
 121
 122 void
 123 Stem_engraver::stop_translation_timestep ()
 124 {
 125   if (tremolo_p_)
 126     {
 127       Stem_tremolo::set_stem (tremolo_p_, stem_p_);
 128       typeset_grob (tremolo_p_);
 129       tremolo_p_ = 0;
 130     }
 131
 132   if (stem_p_)
 133     {
 134       SCM prop = get_property ("stemLeftBeamCount");
 135       if (gh_number_p (prop))
 136         {
 137           Stem::set_beaming (stem_p_,gh_scm2int (prop),LEFT);
 138           daddy_trans_l_->set_property ("stemLeftBeamCount", SCM_UNDEFINED);
 139         }
 140       prop = get_property ("stemRightBeamCount");
 141       if (gh_number_p (prop))
 142         {
 143           Stem::set_beaming (stem_p_,gh_scm2int (prop), RIGHT);
 144           daddy_trans_l_->set_property ("stemRightBeamCount", SCM_UNDEFINED);
 145         }
 146
 147
 148       // UGH. Should mark non-forced instead.
 149       /*
 150          aargh: I don't get it.  direction is being set (and then set
 151          to forced), if we have a Chord_tremolo.
 152        */
 153       SCM dir = stem_p_->get_grob_property ("direction");
 154       if (gh_number_p (dir) && to_dir (dir))
 155         {
 156           stem_p_->set_grob_property ("dir-forced", SCM_BOOL_T);
 157         }
 158
 159       typeset_grob (stem_p_);
 160       stem_p_ = 0;
 161     }
 162
 163
 164   tremolo_req_l_ = 0;
 165 }
 166
 167 bool
 168 Stem_engraver::try_music (Music* r)
 169 {
 170   if (Tremolo_req* a = dynamic_cast <Tremolo_req *> (r))
 171     {
 172       tremolo_req_l_ = a;
 173       return true;
 174     }
 175   return false;
 176 }
 177