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--1999 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8 */
   9
  10 #include "proto.hh"
  11 #include "misc.hh"
  12 #include "debug.hh"
  13
  14 #include "align-element.hh"
  15 #include "stem.hh"
  16 #include "paper-def.hh"
  17 #include "lookup.hh"
  18 #include "stem-info.hh"
  19 #include "beam.hh"
  20 #include "staff-symbol.hh"
  21
  22 Stem_info::Stem_info ()
  23 {
  24 }
  25 /*
  26   FIXME: y dims should not be in internote.
  27  */
  28
  29 Stem_info::Stem_info (Stem*s, int mult)
  30 {
  31   mult_i_ =mult;
  32   stem_l_ = s;
  33   x_ = stem_l_->hpos_f ();
  34   dir_ = stem_l_->dir_;
  35   SCM bd = stem_l_->remove_elt_property (beam_dir_scm_sym);
  36
  37   beam_dir_ = gh_scm2int (SCM_CDR(bd));
  38   interstaff_f_ = 0;
  39
  40   Paper_def* paper_l = stem_l_->paper_l ();
  41   Real internote_f = stem_l_->staff_line_leading_f ()/2;
  42   Real interbeam_f = paper_l->interbeam_f (mult_i_);
  43   Real beam_f = paper_l->beam_thickness_f ();
  44
  45   {
  46       static int i = 1;
  47       DOUT << "******" << i++ << "******\n"
  48            << "begin_f: " << stem_l_->stem_begin_f () * dir_
  49            << "\nchord_f/i: " << stem_l_->chord_start_f () * dir_ / internote_f << '\n';
  50   }
  51
  52   // strangely enough, dim(chord_start_f) == pt (and not internote!)
  53   idealy_f_ = stem_l_->chord_start_f () / internote_f;
  54
  55   // calculate using dim(y) == pt
  56   idealy_f_ *= internote_f;
  57
  58   // for simplicity, we calculate as if dir == UP
  59   idealy_f_ *= beam_dir_;
  60
  61   bool grace_b = stem_l_->get_elt_property (grace_scm_sym) != SCM_BOOL_F;
  62
  63   int stem_max = (int)rint(paper_l->get_var ("stem_max"));
  64   String type_str = grace_b ? "grace_" : "";
  65   Real min_stem_f = paper_l->get_var (type_str + "minimum_stem_length"
  66                                       + to_str (mult_i_ <? stem_max)) * internote_f;
  67   Real stem_f = paper_l->get_var (type_str + "stem_length"
  68                                   + to_str (mult_i_ <? stem_max))* internote_f;
  69
  70   if (!beam_dir_ || (beam_dir_ == dir_))
  71     /* normal beamed stem */
  72     {
  73       if (mult_i_)
  74         {
  75           idealy_f_ += beam_f;
  76           idealy_f_ += (mult_i_ - 1) * interbeam_f;
  77         }
  78       miny_f_ = idealy_f_;
  79       maxy_f_ = INT_MAX;
  80
  81       idealy_f_ += stem_f;
  82       miny_f_ += min_stem_f;
  83
  84       /*
  85         lowest beam of (UP) beam must never be lower than second staffline
  86
  87         Hmm, reference (Wanske?)
  88
  89         Although this (additional) rule is probably correct,
  90         I expect that highest beam (UP) should also never be lower
  91         than middle staffline, just as normal stems.
  92
  93       */
  94       if (!grace_b)
  95         {
  96           //highest beam of (UP) beam must never be lower than middle staffline
  97           miny_f_ = miny_f_ >? 0;
  98           //lowest beam of (UP) beam must never be lower than second staffline
  99           miny_f_ = miny_f_ >? (- 2 * internote_f - beam_f
 100                                 + (mult_i_ > 0) * beam_f + interbeam_f * (mult_i_ - 1));
 101         }
 102     }
 103   else
 104     /* knee */
 105     {
 106       idealy_f_ -= beam_f;
 107       // idealy_f_ -= (mult_i_ - 1) * interbeam_f;
 108       // idealy_f_ += (mult_i_ - stem_l_->flag_i_ >? 0) * interbeam_f;
 109       maxy_f_ = idealy_f_;
 110       miny_f_ = -INT_MAX;
 111
 112       idealy_f_ -= stem_f;
 113       maxy_f_ -= min_stem_f;
 114     }
 115
 116   // set dim(y) == internote
 117   idealy_f_ /= internote_f;
 118   miny_f_ /= internote_f;
 119   maxy_f_ /= internote_f;
 120
 121   DOUT << "dir_: " << dir_ << '\n';
 122   DOUT << "mult_i_: " << mult_i_ << '\n';
 123   DOUT << "idealy_f_: " << idealy_f_ << '\n';
 124   DOUT << "miny_f_: " << miny_f_ << '\n';
 125   DOUT << "maxy_f_: " << maxy_f_ << '\n';
 126
 127   idealy_f_ = maxy_f_ <? idealy_f_;
 128   idealy_f_ = miny_f_ >? idealy_f_;
 129
 130   // interstaff beam
 131   Beam* beam_l = stem_l_->beam_l_;
 132
 133   Dimension_cache *common = stem_l_->common_group (beam_l, Y_AXIS);
 134   Align_element * align = dynamic_cast<Align_element*> (common->element_l ());
 135   if (align && align->axis() == Y_AXIS)
 136     {
 137       if (align->threshold_interval_[MIN] !=
 138           align->threshold_interval_[MAX])
 139         warning (_ ("minVerticalAlign != maxVerticalAlign: interstaff beams/slurs may be broken"));
 140
 141       interstaff_f_ = align->threshold_interval_[MIN] / internote_f;
 142
 143       Dimension_cache * beam_refpoint = beam_l->dim_cache_[Y_AXIS];
 144       Dimension_cache * stem_refpoint = stem_l_->dim_cache_[Y_AXIS];
 145
 146       while (beam_refpoint->parent_l_ != common)
 147         beam_refpoint = beam_refpoint->parent_l_;
 148       while (stem_refpoint->parent_l_ != common)
 149         stem_refpoint = stem_refpoint->parent_l_;
 150
 151
 152       int beam_prio =
 153         align->get_priority (dynamic_cast<Score_element*> (beam_refpoint->element_l ()));
 154       int stem_prio =
 155         align->get_priority (dynamic_cast<Score_element*> (stem_refpoint->element_l ()));
 156
 157       /*
 158         our staff is lower -> interstaff_f_ *= -1
 159        */
 160       if (beam_prio < stem_prio)
 161         interstaff_f_ *= -1;
 162
 163       idealy_f_ += interstaff_f_ * beam_dir_;
 164       miny_f_ += interstaff_f_ * beam_dir_;
 165       maxy_f_ += interstaff_f_ * beam_dir_;
 166     }
 167 }
 168