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
  24 Hyphen_spanner::Hyphen_spanner ()
  25   : Directional_spanner ()
  26 {
  27   dx_f_drul_[LEFT] = dx_f_drul_[RIGHT] = 0.0;
  28 }
  29
  30 // UGH - is this even used?
  31 Offset
  32 Hyphen_spanner::center () const
  33 {
  34   Real dx = extent (X_AXIS).length ();
  35
  36   return Offset (dx / 2, 0);
  37 }
  38
  39 Molecule*
  40 Hyphen_spanner::do_brew_molecule_p () const
  41 {
  42   Molecule* mol_p = new Molecule;
  43
  44   Real w = extent (X_AXIS).length ();
  45
  46   w += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
  47
  48   Real th = paper_l ()->get_var ("hyphen_thickness");
  49   Real h = paper_l ()->get_var ("hyphen_height");
  50
  51   // UGH. First try: just make the hyphen take 1/3 of the available space
  52   // for length, use a geometric mean of the available space and some minimum
  53   Real l = paper_l ()->get_var ("hyphen_minimum_length");
  54   if(l < w)
  55     l = sqrt(l*w);
  56   Molecule a = lookup_l ()->filledbox ( Box (Interval ((w-l)/2,(w+l)/2), Interval (h,h+th)));
  57   a.translate (Offset (dx_f_drul_[LEFT], 0));
  58
  59   mol_p->add_molecule (a);
  60
  61   return mol_p;
  62 }
  63
  64 Interval
  65 Hyphen_spanner::do_height () const
  66 {
  67   return Interval (0,0);
  68 }
  69
  70 void
  71 Hyphen_spanner::do_post_processing ()
  72 {
  73   // UGH
  74   Real gap = paper_l ()->get_var ("interline");
  75
  76   Direction d = LEFT;
  77   do
  78     {
  79       Item* t = spanned_drul_[d]
  80         ? spanned_drul_[d] : spanned_drul_[(Direction)-d];
  81       if (d == LEFT)
  82         dx_f_drul_[d] += t->extent (X_AXIS).length ();
  83       else
  84         dx_f_drul_[d] -= d * gap / 2;
  85     }
  86   while (flip(&d) != LEFT);
  87 }
  88
  89
  90 void
  91 Hyphen_spanner::set_textitem (Direction d, Item* textitem_l)
  92 {
  93   set_bounds (d, textitem_l);
  94   add_dependency (textitem_l);
  95 }
  96
  97