lily/hyphen-spanner.cc

   1 /*
   2   hyphen-spanner.cc -- implement Hyphen_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Glen Prideaux <glenprideaux@iname.com>
   7
   8   (adapted from extender-spanner)
   9 */
  10
  11 /*
  12   TODO: too complicated implementation.  Why the dx_drul?.
  13  */
  14
  15 #include <math.h>
  16 #include "box.hh"
  17 #include "debug.hh"
  18 #include "lookup.hh"
  19 #include "molecule.hh"
  20 #include "paper-column.hh"
  21 #include "paper-def.hh"
  22 #include "hyphen-spanner.hh"
  23 #include "dimension-cache.hh"
  24
  25 Hyphen_spanner::Hyphen_spanner ()
  26   : Spanner ()
  27 {
  28   dx_f_drul_[LEFT] = dx_f_drul_[RIGHT] = 0.0;
  29
  30   dim_cache_[Y_AXIS]->set_callback (Dimension_cache::point_dimension_callback);
  31 }
  32
  33 Molecule*
  34 Hyphen_spanner::do_brew_molecule_p () const
  35 {
  36   Molecule* mol_p = new Molecule;
  37
  38   Real w = spanner_length ();
  39
  40   w += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
  41
  42   Real th = paper_l ()->get_var ("hyphen_thickness");
  43   Real h = paper_l ()->get_var ("hyphen_height");
  44
  45   // UGH. First try: just make the hyphen take 1/3 of the available space
  46   // for length, use a geometric mean of the available space and some minimum
  47   Real l = paper_l ()->get_var ("hyphen_minimum_length");
  48   if(l < w)
  49     l = sqrt(l*w);
  50   Molecule a = lookup_l ()->filledbox ( Box (Interval ((w-l)/2,(w+l)/2), Interval (h,h+th)));
  51   a.translate (Offset (dx_f_drul_[LEFT], 0));
  52
  53   mol_p->add_molecule (a);
  54
  55   return mol_p;
  56 }
  57
  58
  59 void
  60 Hyphen_spanner::do_post_processing ()
  61 {
  62   // UGH
  63   Real gap = paper_l ()->get_var ("interline");
  64
  65   Direction d = LEFT;
  66   do
  67     {
  68       Item* t = spanned_drul_[d]
  69         ? spanned_drul_[d] : spanned_drul_[(Direction)-d];
  70       if (d == LEFT)
  71         dx_f_drul_[d] += t->extent (X_AXIS).length ();
  72       else
  73         dx_f_drul_[d] -= d * gap / 2;
  74     }
  75   while (flip(&d) != LEFT);
  76 }
  77
  78
  79 void
  80 Hyphen_spanner::set_textitem (Direction d, Item* textitem_l)
  81 {
  82   set_bounds (d, textitem_l);
  83   add_dependency (textitem_l);
  84 }
  85
  86