2 hyphen-spanner.cc -- implement Hyphen_spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 2003--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "lyric-hyphen.hh"
13 #include "output-def.hh"
14 #include "paper-column.hh"
17 MAKE_SCHEME_CALLBACK (Hyphen_spanner, print, 1)
19 Hyphen_spanner::print (SCM smob)
21 Spanner *me = unsmob_spanner (smob);
22 Drul_array<Item *> bounds (me->get_bound (LEFT),
23 me->get_bound (RIGHT));
25 if (bounds[LEFT]->break_status_dir ()
26 && Paper_column::when_mom (bounds[LEFT]) == Paper_column::when_mom (bounds[RIGHT]->get_column ()))
29 Grob *common = bounds[LEFT]->common_refpoint (bounds[RIGHT], X_AXIS);
33 Drul_array<bool> broken;
36 Interval iv = bounds[d]->extent (common, X_AXIS);
38 span_points[d] = iv.is_empty ()
39 ? bounds[d]->relative_coordinate (common, X_AXIS)
42 while (flip (&d) != LEFT);
44 Real lt = me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
45 Real th = robust_scm2double (me->get_property ("thickness"), 1) * lt;
46 Real h = robust_scm2double (me->get_property ("height"), 0.5);
50 Real dash_period = robust_scm2double (me->get_property ("dash-period"), 1.0);
51 Real dash_length = robust_scm2double (me->get_property ("length"), .5);
52 Real padding = robust_scm2double (me->get_property ("padding"), 0.1);
54 if (dash_period < dash_length)
55 dash_period = 1.5 * dash_length;
57 Real l = span_points.length ();
59 int n = int (ceil (l / dash_period - 0.5));
63 if (l < dash_length + 2 * padding
64 && !bounds[RIGHT]->break_status_dir ())
66 Real minimum_length = robust_scm2double (me->get_property ("minimum-length"), .3);
67 dash_length = max ((l - 2 * padding), minimum_length);
70 Real space_left = l - dash_length - (n - 1) * dash_period;
73 If there is not enough space, the hyphen should disappear, but not
74 at the end of the line.
77 && !bounds[RIGHT]->break_status_dir ())
80 space_left = max (space_left, 0.0);
82 Box b (Interval (0, dash_length), Interval (h, h + th));
83 Stencil dash_mol (Lookup::round_filled_box (b, 0.8 * lt));
86 for (int i = 0; i < n; i++)
89 m.translate_axis (span_points[LEFT] + i * dash_period + space_left / 2, X_AXIS);
90 total.add_stencil (m);
93 total.translate_axis (-me->relative_coordinate (common, X_AXIS), X_AXIS);
94 return total.smobbed_copy ();
97 MAKE_SCHEME_CALLBACK (Hyphen_spanner, set_spacing_rods, 1);
99 Hyphen_spanner::set_spacing_rods (SCM smob)
101 Grob *me = unsmob_grob (smob);
104 Spanner *sp = dynamic_cast<Spanner *> (me);
106 = robust_scm2double (me->get_property ("minimum-length"), 0);
108 if (r.distance_ > 0.0)
110 Real padding = robust_scm2double (me->get_property ("padding"), 0.1);
111 r.distance_ += 2*padding;
115 r.item_drul_[d] = sp->get_bound (d);
117 r.distance_ += r.item_drul_[d]->extent (r.item_drul_[d], X_AXIS)[-d];
119 while (flip (&d) != LEFT);
121 if (r.item_drul_[LEFT]
122 && r.item_drul_[RIGHT])
126 return SCM_UNSPECIFIED;
129 ADD_INTERFACE (Hyphen_spanner, "lyric-hyphen-interface",
130 "A centred hyphen is a simple line between lyrics used to divide syllables",
131 "padding thickness height dash-period minimum-length length");