2 lyric-extender.cc -- implement Lyric_extender
3 source file of the GNU LilyPond music typesetter
5 (c) 1998--2003 Jan Nieuwenhuizen <janneke@gnu.org>
14 #include "molecule.hh"
15 #include "paper-column.hh"
16 #include "paper-def.hh"
17 #include "lyric-extender.hh"
18 #include "note-head.hh"
19 #include "group-interface.hh"
21 MAKE_SCHEME_CALLBACK (Lyric_extender,brew_molecule,1)
23 Lyric_extender::brew_molecule (SCM smob)
25 Spanner *me = unsmob_spanner (smob);
26 Item *l = me->get_bound (LEFT);
27 Item *r = me->get_bound (RIGHT);
28 Grob *common = l->common_refpoint (r, X_AXIS);
31 Real sl = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
33 Link_array<Grob> heads (Pointer_group_interface__extract_grobs (me, (Grob*)0,
36 if (!heads.size () && r->break_status_dir () == CENTER)
39 common = common_refpoint_of_array (heads, common, X_AXIS);
41 Real left_point = 0.0;
42 if (l->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
43 left_point = l->extent (common, X_AXIS)[RIGHT];
45 left_point = heads[0]->extent (common, X_AXIS)[LEFT];
47 if (isinf (left_point))
51 It seems that short extenders are even lengthened to go past the note head, but
52 haven't found a pattern in it yet. --hwn 1/1/04
55 SCM minlen = me->get_grob_property ("minimum-length");
57 = left_point + (robust_scm2double (minlen,0));
59 if (r->break_status_dir ())
60 right_point = infinity_f;
62 right_point = right_point >? heads.top ()->extent (common, X_AXIS)[RIGHT];
64 Real h = sl * robust_scm2double (me->get_grob_property ("thickness"), 0);
66 right_point = right_point <? (r->extent (common, X_AXIS)[LEFT] - pad);
68 if (isinf (right_point))
74 Real w = right_point - left_point;
79 Molecule mol (Lookup::round_filled_box (Box (Interval (0,w), Interval (0,h)),
81 mol.translate_axis (left_point - me->relative_coordinate (common, X_AXIS), X_AXIS);
82 return mol.smobbed_copy ();
86 ADD_INTERFACE (Lyric_extender,"lyric-extender-interface",
87 "The extender is a simple line at the baseline of the lyric "
88 " that helps show the length of a melissima (tied/slurred note).",