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 lyric-extender)
   9 */
  10
  11 #include <math.h>
  12
  13 #include "box.hh"
  14 #include "lookup.hh"
  15 #include "molecule.hh"
  16 #include "paper-def.hh"
  17 #include "hyphen-spanner.hh"
  18 #include "spanner.hh"
  19 #include "item.hh"
  20
  21 MAKE_SCHEME_SCORE_ELEMENT_CALLBACK(Hyphen_spanner,brew_molecule)
  22
  23 SCM
  24 Hyphen_spanner::brew_molecule (SCM smob)
  25 {
  26   Spanner * sp = dynamic_cast<Spanner*> (unsmob_element (smob));
  27
  28   Score_element * common = sp;
  29   Direction d = LEFT;
  30   do
  31     {
  32       common = common->common_refpoint( sp->get_bound (d), X_AXIS);
  33     }
  34   while (flip (&d) != LEFT);
  35   Interval bounds;
  36
  37   do
  38     {
  39       Real  x = sp->get_bound (d)->relative_coordinate (common, X_AXIS);
  40       Interval ext =  sp->get_bound (d)->extent (X_AXIS);
  41       bounds[d] = (x + ext[-d]);
  42     }
  43   while (flip (&d) != LEFT);
  44
  45
  46
  47   Real ss = sp->paper_l ()->get_var ("staffspace");
  48   Real lt = sp->paper_l ()->get_var ("stafflinethickness");
  49   Real th = gh_scm2double (sp->get_elt_property ("thickness")) * lt ;
  50   Real h = gh_scm2double (sp->get_elt_property ("height")) * ss;
  51   Real l = gh_scm2double (sp->get_elt_property ("minimum-length")) * ss;
  52   Real w  = bounds.length ();
  53   /* First try: just make the hyphen take 1/3 of the available space
  54    for length, use a geometric mean of the available space and some minimum
  55   */
  56   if(l < w)
  57     l = sqrt(l*w);
  58
  59   Box b  (Interval (-l/2,l/2), Interval (h,h+th));
  60   Molecule mol (sp->lookup_l ()->filledbox (b));
  61   mol.translate_axis (bounds.center ()
  62                       -sp->relative_coordinate (common, X_AXIS),
  63                       X_AXIS);
  64   return mol.create_scheme ();
  65 }
  66
  67 void
  68 Hyphen_spanner::set_textitem (Direction d, Score_element* b)
  69 {
  70   elt_l_->set_bound (d, b);
  71   elt_l_->add_dependency (b);
  72 }
  73
  74 Hyphen_spanner::Hyphen_spanner (Spanner*s)
  75 {
  76   elt_l_ = s;
  77 }