lily/encompass-info.cc

   1 /*
   2   encompass-info.cc -- implement Encompass_info
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8 */
   9
  10 #include "proto.hh"
  11 #include "stem.hh"
  12 #include "note-column.hh"
  13 #include "paper-def.hh"
  14 #include "encompass-info.hh"
  15 #include "slur.hh"
  16 #include "staff-sym.hh"
  17 #include "note-head.hh"
  18 #include "debug.hh"
  19
  20 Encompass_info::Encompass_info ()
  21 {
  22   assert (0);
  23 }
  24
  25 Encompass_info::Encompass_info (Note_column const* note, Direction dir)
  26 {
  27   interstaff_f_ = 0;
  28
  29   Paper_def* paper = note->paper ();
  30   Real interline = paper->interline_f ();
  31   // UGH
  32   Real notewidth = paper->note_width () * 0.8;
  33   Real internote = interline / 2;
  34
  35   Stem* stem_l = note->stem_l_;
  36   /*
  37     set o_.x () to middle of notehead or on the exact position of stem,
  38     according to slur direction
  39    */
  40   o_.x () = stem_l->hpos_f ();
  41
  42   /*
  43      stem_l->dir == dir
  44                       ________
  45            |   |     /        \
  46           x|  x|       |x  |x
  47         \________/     |   |
  48
  49    */
  50
  51   if (stem_l->dir_ != dir)
  52     o_.x () -= 0.5 * notewidth * stem_l->dir_;
  53
  54   o_.y () = stem_l->extent (Y_AXIS)[dir];
  55   /*
  56    leave a gap: slur mustn't touch head/stem
  57    */
  58   o_.y () += 2.5 * internote * dir;
  59
  60   if (stem_l->dir_ != dir)
  61     o_.y () += 1.0 * internote * dir;
  62
  63   Slur* slur_l = stem_l->slur_l_;
  64   if (slur_l->encompass_arr_.size ()
  65       && stem_l->staff_sym_l_ != slur_l->encompass_arr_[0]->stem_l_->staff_sym_l_)
  66     {
  67 #if 0 // this is nonsense..., don't issue warning
  68       if (stem_l->staff_sym_l_->dim_cache_[Y_AXIS].valid_b ())
  69         {
  70           interstaff_f_ = stem_l->staff_sym_l_->absolute_coordinate (Y_AXIS)
  71             - slur_l->encompass_arr_[0]->stem_l_->staff_sym_l_->absolute_coordinate (Y_AXIS);
  72         }
  73       else
  74 #endif
  75         {
  76           //  warning (_ ("invalid dimension cache: guessing staff position"));
  77           if (slur_l->vertical_align_drul_[MIN] !=
  78               slur_l->vertical_align_drul_[MAX])
  79             warning (_ ("minVerticalAlign != maxVerticalAlign: interstaff slurs may be broken"));
  80           interstaff_f_ = slur_l->vertical_align_drul_[MIN];
  81           /* urg, guess staff order */
  82           int d = note->head_l_arr_.top ()->steps_i_
  83             - slur_l->encompass_arr_[0]->head_l_arr_[0]->steps_i_;
  84           if (abs (d > 3))
  85             interstaff_f_ *= sign (d);
  86           else if (stem_l->chord_start_f () >
  87                    slur_l->encompass_arr_[0]->stem_l_->chord_start_f ())
  88             interstaff_f_ *= -1;
  89         }
  90       o_.y () += interstaff_f_;
  91     }
  92 }