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       Interval iv = sp->get_bound (d)->extent (common, X_AXIS);
  41
  42       bounds[d] = iv.empty_b ()
  43         ? sp->get_bound (d)->relative_coordinate (common, X_AXIS)
  44         : iv[-d];
  45     }
  46   while (flip (&d) != LEFT);
  47
  48   Real lt = sp->paper_l ()->get_var ("stafflinethickness");
  49   Real th = gh_scm2double (sp->get_grob_property ("thickness")) * lt ;
  50   Real h = gh_scm2double (sp->get_grob_property ("height"));
  51
  52   // interval?
  53   Real l = gh_scm2double (sp->get_grob_property ("minimum-length"));
  54   Real x = gh_scm2double (sp->get_grob_property ("maximum-length"));
  55   // The hyphen can exist in the word space of the left lyric ...
  56   SCM space =  sp->get_bound (LEFT)->get_grob_property ("word-space");
  57   if (gh_number_p (space))
  58     {
  59       bounds[LEFT] -=  gh_scm2double (space);
  60     }
  61
  62   /*
  63     we should probably do something more intelligent when bounds is
  64     empty, but at least this doesn't crash.
  65   */
  66   Real w  = bounds.empty_b () ? 0 : bounds.length ();
  67
  68   /* for length, use a geometric mean of the available space and some minimum
  69    */
  70   if (l < w)
  71     {
  72       l = sqrt (l*w);
  73       if (l > x)
  74         l = x;
  75     }
  76   else
  77     {
  78       /* OK, we have a problem. Usually this means that we're on the
  79          first column, and we have a long lyric which extends to near
  80          the offset for stuff */
  81       /* This test for being on the first column has been shamelessly
  82          ripped from spanner.cc */
  83       Paper_column *sc = dynamic_cast<Paper_column*> (sp->get_bound (LEFT)->column_l ());
  84       if (sc != NULL &&
  85           sc->break_status_dir () == RIGHT)
  86         {
  87           /* We are on the first column, so it's probably harmless to
  88              get the minimum length back by extending leftwards into
  89              the space under the clef/key sig/time sig */
  90           bounds[LEFT] = bounds[RIGHT] - l;
  91         }
  92       else
  93         {
  94           /* We can't get the length desired. Maybe we should warn. */
  95           l = w;
  96         }
  97     }
  98   Box b (Interval (-l/2,l/2), Interval (h,h+th));
  99   Molecule mol (Lookup::filledbox (b));
 100   Real ct = bounds.empty_b () ? 0 : bounds.center () ;
 101   mol.translate_axis (ct -sp->relative_coordinate (common, X_AXIS), X_AXIS);
 102   return mol.smobbed_copy ();
 103 }
 104
 105 void
 106 Hyphen_spanner::set_textitem (Direction d, Grob* b)
 107 {
 108   elt_l_->set_bound (d, b);
 109   elt_l_->add_dependency (b);
 110 }
 111
 112 Hyphen_spanner::Hyphen_spanner (Spanner*s)
 113 {
 114   elt_l_ = s;
 115 }
 116