lily/lyric-hyphen.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2003--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "lyric-hyphen.hh"
  21
  22
  23 #include "lookup.hh"
  24 #include "output-def.hh"
  25 #include "paper-column.hh"
  26 #include "moment.hh"
  27 #include "spanner.hh"
  28
  29 /*
  30   TODO: should extract hyphen dimensions or hyphen glyph from the
  31   font.
  32  */
  33
  34 MAKE_SCHEME_CALLBACK (Lyric_hyphen, print, 1);
  35 SCM
  36 Lyric_hyphen::print (SCM smob)
  37 {
  38   Spanner *me = unsmob_spanner (smob);
  39   Drul_array<Item *> bounds (me->get_bound (LEFT),
  40                              me->get_bound (RIGHT));
  41
  42   if (bounds[LEFT]->break_status_dir ()
  43       && (Paper_column::when_mom (bounds[LEFT])
  44           == Paper_column::when_mom (bounds[RIGHT]->get_column ())))
  45     return SCM_EOL;
  46
  47   Grob *common = bounds[LEFT]->common_refpoint (bounds[RIGHT], X_AXIS);
  48
  49   Interval span_points;
  50   Direction d = LEFT;
  51   Drul_array<bool> broken;
  52   do
  53     {
  54       Interval iv = bounds[d]->extent (common, X_AXIS);
  55
  56       span_points[d] = iv.is_empty ()
  57         ? bounds[d]->relative_coordinate (common, X_AXIS)
  58         : iv[-d];
  59     }
  60   while (flip (&d) != LEFT);
  61
  62   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
  63   Real th = robust_scm2double (me->get_property ("thickness"), 1) * lt;
  64   Real font_size_step = robust_scm2double (me->get_property ("font-size"), 0.0);
  65   Real h = robust_scm2double (me->get_property ("height"), 0.5)
  66     * pow (2.0, font_size_step / 6.0);
  67
  68   // interval?
  69
  70   Real dash_period = robust_scm2double (me->get_property ("dash-period"), 1.0);
  71   Real dash_length = robust_scm2double (me->get_property ("length"), .5);
  72   Real padding = robust_scm2double (me->get_property ("padding"), 0.1);
  73
  74   if (dash_period < dash_length)
  75     dash_period = 1.5 * dash_length;
  76
  77   Real l = span_points.length ();
  78
  79   int n = int (ceil (l / dash_period - 0.5));
  80   if (n <= 0)
  81     n = 1;
  82
  83   if (l < dash_length + 2 * padding
  84       && !bounds[RIGHT]->break_status_dir ())
  85     {
  86       Real minimum_length = robust_scm2double (me->get_property ("minimum-length"), .3);
  87       dash_length = max ((l - 2 * padding), minimum_length);
  88     }
  89
  90   Real space_left = l - dash_length - (n - 1) * dash_period;
  91
  92   /*
  93     If there is not enough space, the hyphen should disappear, but not
  94     at the end of the line.
  95   */
  96   if (space_left < 0.0
  97       && !bounds[RIGHT]->break_status_dir ())
  98     return SCM_EOL;
  99
 100   space_left = max (space_left, 0.0);
 101
 102   Box b (Interval (0, dash_length), Interval (h, h + th));
 103   Stencil dash_mol (Lookup::round_filled_box (b, 0.8 * lt));
 104
 105   Stencil total;
 106   for (int i = 0; i < n; i++)
 107     {
 108       Stencil m (dash_mol);
 109       m.translate_axis (span_points[LEFT] + i * dash_period + space_left / 2, X_AXIS);
 110       total.add_stencil (m);
 111     }
 112
 113   total.translate_axis (-me->relative_coordinate (common, X_AXIS), X_AXIS);
 114   return total.smobbed_copy ();
 115 }
 116
 117 MAKE_SCHEME_CALLBACK (Lyric_hyphen, set_spacing_rods, 1);
 118 SCM
 119 Lyric_hyphen::set_spacing_rods (SCM smob)
 120 {
 121   Grob *me = unsmob_grob (smob);
 122
 123   Rod r;
 124   Spanner *sp = dynamic_cast<Spanner *> (me);
 125
 126   r.distance_ = robust_scm2double (me->get_property ("minimum-distance"), 0);
 127   Direction d = LEFT;
 128   do
 129     {
 130       r.item_drul_[d] = sp->get_bound (d);
 131       if (r.item_drul_[d])
 132         r.distance_ += -d * r.item_drul_[d]->extent (r.item_drul_[d], X_AXIS)[-d];
 133     }
 134   while (flip (&d) != LEFT);
 135
 136   if (r.item_drul_[LEFT]
 137       && r.item_drul_[RIGHT])
 138     r.add_to_cols ();
 139
 140   return SCM_UNSPECIFIED;
 141 }
 142
 143 ADD_INTERFACE (Lyric_hyphen,
 144                "A centered hyphen is simply a line between lyrics used to"
 145                " divide syllables.",
 146
 147                /* properties */
 148                "dash-period "
 149                "height "
 150                "length "
 151                "minimum-distance "
 152                "minimum-length "
 153                "padding "
 154                "thickness "
 155                );
 156