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 "paper-column.hh"
  19 #include "spanner.hh"
  20 #include "item.hh"
  21
  22 MAKE_SCHEME_CALLBACK(Hyphen_spanner,brew_molecule,1)
  23
  24 SCM
  25 Hyphen_spanner::brew_molecule (SCM smob)
  26 {
  27   Spanner * sp = dynamic_cast<Spanner*> (unsmob_grob (smob));
  28
  29   Grob * common = sp;
  30   Direction d = LEFT;
  31   do
  32     {
  33       common = common->common_refpoint( sp->get_bound (d), X_AXIS);
  34     }
  35   while (flip (&d) != LEFT);
  36   Interval bounds;
  37
  38   do
  39     {
  40       bounds[d] = sp->get_bound (d)->extent (common, X_AXIS)[-d];
  41     }
  42   while (flip (&d) != LEFT);
  43
  44   Real lt = sp->paper_l ()->get_var ("stafflinethickness");
  45   Real th = gh_scm2double (sp->get_grob_property ("thickness")) * lt ;
  46   Real h = gh_scm2double (sp->get_grob_property ("height"));
  47   Real l = gh_scm2double (sp->get_grob_property ("minimum-length"));
  48   // The hyphen can exist in the word space of the left lyric ...
  49   SCM space =  sp->get_bound (LEFT)->get_grob_property ("word-space");
  50   if (gh_number_p (space))
  51     {
  52       bounds[LEFT] -=  gh_scm2double (space);
  53     }
  54   Real w  = bounds.length ();
  55   /* for length, use a geometric mean of the available space and some minimum
  56   */
  57   if(l < w)
  58     l = sqrt(l*w);
  59   else
  60     {
  61       /* OK, we have a problem. Usually this means that we're on the
  62          first column, and we have a long lyric which extends to near
  63          the offset for stuff */
  64       /* This test for being on the first column has been shamelessly
  65          ripped from spanner.cc */
  66       Paper_column *sc = dynamic_cast<Paper_column*> (sp->get_bound(LEFT)->column_l());
  67       if (sc != NULL &&
  68           sc->break_status_dir () == RIGHT)
  69         {
  70           /* We are on the first column, so it's probably harmless to
  71              get the minimum length back by extending leftwards into
  72              the space under the clef/key sig/time sig */
  73           bounds[LEFT] = bounds[RIGHT] - l;
  74         }
  75       else
  76         {
  77           /* We can't get the length desired. Maybe we should warn. */
  78           l = w;
  79         }
  80     }
  81   Box b  (Interval (-l/2,l/2), Interval (h,h+th));
  82   Molecule mol (Lookup::filledbox (b));
  83   mol.translate_axis (bounds.center ()
  84                       -sp->relative_coordinate (common, X_AXIS),
  85                       X_AXIS);
  86   return mol.smobbed_copy ();
  87 }
  88
  89 void
  90 Hyphen_spanner::set_textitem (Direction d, Grob* b)
  91 {
  92   elt_l_->set_bound (d, b);
  93   elt_l_->add_dependency (b);
  94 }
  95
  96 Hyphen_spanner::Hyphen_spanner (Spanner*s)
  97 {
  98   elt_l_ = s;
  99 }
 100