lily/stem-info.cc

   1 /*
   2   stem-info.cc -- implement Stem_info
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1998 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8 */
   9
  10 #include "proto.hh"
  11 #include "misc.hh"
  12 #include "debug.hh"
  13 #include "atom.hh"
  14 #include "stem.hh"
  15 #include "paper-def.hh"
  16 #include "lookup.hh"
  17 #include "stem-info.hh"
  18 #include "beam.hh"
  19 #include "staff-sym.hh"
  20
  21 Stem_info::Stem_info ()
  22 {
  23 }
  24
  25 Stem_info::Stem_info (Stem*s)
  26 {
  27   stem_l_ = s;
  28   x_ = stem_l_->hpos_f ();
  29   dir_ = stem_l_->dir_;
  30   beam_dir_ = stem_l_->beam_dir_;
  31   mult_i_ = stem_l_->mult_i_;
  32   interstaff_f_ = 0;
  33
  34   Paper_def* paper_l = stem_l_->paper ();
  35   Real internote_f = paper_l->internote_f ();
  36   Real interbeam_f = paper_l->interbeam_f (mult_i_);
  37   Real beam_f = paper_l->beam_thickness_f ();
  38
  39   {
  40       static int i = 1;
  41       DOUT << "******" << i++ << "******\n"
  42            << "begin_f: " << stem_l_->stem_begin_f () * dir_
  43            << "\nchord_f/i: " << stem_l_->chord_start_f () * dir_ / internote_f << '\n';
  44   }
  45
  46   // strangely enough, dim(chord_start_f) == pt (and not internote!)
  47   idealy_f_ = stem_l_->chord_start_f () / internote_f;
  48
  49   // calculate using dim(y) == pt
  50   idealy_f_ *= internote_f;
  51
  52   // for simplicity, we calculate as if dir == UP
  53   idealy_f_ *= beam_dir_;
  54
  55   int stem_max = (int)rint(paper_l->get_var ("stem_max"));
  56   Real min_stem_f = paper_l->get_var (String ("minimum_stem_length")
  57                                      + to_str (mult_i_ <? stem_max));
  58   Real stem_f = paper_l->get_var (String ("stem_length")
  59                                  + to_str (mult_i_ <? stem_max));
  60
  61   if (!beam_dir_ || (beam_dir_ == dir_))
  62     /* normal beamed stem */
  63     {
  64       if (mult_i_)
  65         {
  66           idealy_f_ += beam_f;
  67           idealy_f_ += (mult_i_ - 1) * interbeam_f;
  68         }
  69       miny_f_ = idealy_f_;
  70       maxy_f_ = INT_MAX;
  71
  72       idealy_f_ += stem_f;
  73       miny_f_ += min_stem_f;
  74
  75       // lowest beam of (UP) beam must never be lower than second staffline
  76       miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
  77         + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
  78     }
  79   else
  80     /* knee */
  81     {
  82       idealy_f_ -= beam_f;
  83       // idealy_f_ -= (mult_i_ - 1) * interbeam_f;
  84       // idealy_f_ += (mult_i_ - stem_l_->flag_i_ >? 0) * interbeam_f;
  85       maxy_f_ = idealy_f_;
  86       miny_f_ = -INT_MAX;
  87
  88       idealy_f_ -= stem_f;
  89       maxy_f_ -= min_stem_f;
  90     }
  91
  92   // set dim(y) == internote
  93   idealy_f_ /= internote_f;
  94   miny_f_ /= internote_f;
  95   maxy_f_ /= internote_f;
  96
  97   DOUT << "dir_: " << dir_ << '\n';
  98   DOUT << "mult_i_: " << mult_i_ << '\n';
  99   DOUT << "idealy_f_: " << idealy_f_ << '\n';
 100   DOUT << "miny_f_: " << miny_f_ << '\n';
 101   DOUT << "maxy_f_: " << maxy_f_ << '\n';
 102
 103   idealy_f_ = maxy_f_ <? idealy_f_;
 104   idealy_f_ = miny_f_ >? idealy_f_;
 105
 106   // interstaff beam
 107   Beam* beam_l_ = stem_l_->beam_l_;
 108   if (beam_l_->sinfo_.size ()
 109       && stem_l_->staff_sym_l_ != beam_l_->sinfo_[0].stem_l_->staff_sym_l_)
 110     {
 111       if (stem_l_->staff_sym_l_->dim_cache_[Y_AXIS].valid_b ())
 112         {
 113           interstaff_f_ = stem_l_->staff_sym_l_->absolute_coordinate (Y_AXIS)
 114             - beam_l_->sinfo_[0].stem_l_->staff_sym_l_->absolute_coordinate (Y_AXIS) / internote_f;
 115         }
 116       else
 117         {
 118           warning (_ ("invalid dimension cache: guessing staff position"));
 119           if (beam_l_->vertical_align_drul_[MIN] !=
 120               beam_l_->vertical_align_drul_[MAX])
 121             warning (_ ("minVerticalAlign != maxVerticalAlign: interstaff slurs may be broken"));
 122           interstaff_f_ = beam_l_->vertical_align_drul_[MIN] / internote_f;
 123           // urg, guess staff order:
 124           // if our stem ends higher, our staff is probably lower...
 125           if (idealy_f_ * beam_dir_ > beam_l_->sinfo_[0].idealy_f_ * beam_dir_)
 126             interstaff_f_ *= -1;
 127         }
 128       idealy_f_ += interstaff_f_ * beam_dir_;
 129       miny_f_ += interstaff_f_ * beam_dir_;
 130       maxy_f_ += interstaff_f_ * beam_dir_;
 131     }
 132 }
 133