2 system-start-delimiter.cc -- implement System_start_delimiter
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "system-start-delimiter.hh"
13 #include "axis-group-interface.hh"
14 #include "output-def.hh"
15 #include "font-interface.hh"
16 #include "all-font-metrics.hh"
17 #include "staff-symbol-referencer.hh"
21 #include "pointer-group-interface.hh"
24 System_start_delimiter::staff_bracket (Grob *me, Real height)
26 Font_metric *fm = Font_interface::get_default_font (me);
27 Drul_array<Stencil> tips (fm->find_by_name ("brackettips.down"),
28 fm->find_by_name ("brackettips.up"));
30 Real thickness = robust_scm2double (me->get_property ("thickness"), 0.25);
32 Real overlap = 0.1 * thickness;
34 Stencil bracket = Lookup::filled_box (Box (Interval (0, thickness),
36 * (height / 2 + overlap)));
40 bracket.add_at_edge (Y_AXIS, d, tips[d], -overlap, 0.0);
41 while (flip (&d) != DOWN)
48 System_start_delimiter::simple_bar (Grob *me, Real h)
50 Real lt = me->layout ()->get_dimension (ly_symbol2scm ("linethickness"));
51 Real w = lt * robust_scm2double (me->get_property ("thickness"), 1);
52 return Lookup::round_filled_box (Box (Interval (0, w), Interval (-h / 2, h / 2)),
56 MAKE_SCHEME_CALLBACK (System_start_delimiter, print, 1);
58 System_start_delimiter::print (SCM smob)
60 Spanner *me = unsmob_spanner (smob);
64 SCM s = me->get_property ("glyph");
65 if (!scm_is_string (s))
67 SCM gsym = scm_string_to_symbol (s);
69 Real staff_space = Staff_symbol_referencer::staff_space (me);
71 extract_grob_set (me, "elements", elts);
72 Grob *common = common_refpoint_of_array (elts, me, Y_AXIS);
76 int non_empty_count = 0;
77 for (int i = elts.size (); i--;)
79 Spanner *sp = dynamic_cast<Spanner *> (elts[i]);
82 && sp->get_bound (LEFT) == me->get_bound (LEFT))
84 Interval dims = sp->extent (common, Y_AXIS);
85 if (!dims.is_empty ())
93 if (gsym == ly_symbol2scm ("bar-line")
94 && non_empty_count <= 1)
100 ext -= me->relative_coordinate (common, Y_AXIS);
102 Real len = ext.length () / staff_space;
105 || (robust_scm2double (me->get_property ("collapse-height"), 0.0) >= len))
113 if (gsym == ly_symbol2scm ("bracket"))
114 m = staff_bracket (me, len);
115 else if (gsym == ly_symbol2scm ("brace"))
116 m = staff_brace (me, len);
117 else if (gsym == ly_symbol2scm ("bar-line"))
118 m = simple_bar (me, len);
120 m.translate_axis (ext.center (), Y_AXIS);
121 return m.smobbed_copy ();
125 System_start_delimiter::staff_brace (Grob *me, Real y)
128 /* We go through the style sheet to lookup the font file
129 name. This is better than using find_font directly,
130 esp. because that triggers mktextfm for non-existent
132 SCM fam = scm_cons (ly_symbol2scm ("font-encoding"),
133 ly_symbol2scm ("fetaBraces"));
135 SCM alist = scm_list_n (fam, SCM_UNDEFINED);
136 fm = select_font (me->layout (), scm_list_n (alist, SCM_UNDEFINED));
139 int hi = max (fm->count () - 1, 2);
141 /* do a binary search for each Y, not very efficient, but passable? */
145 int cmp = (lo + hi) / 2;
146 b = fm->get_indexed_char (cmp);
147 if (b[Y_AXIS].is_empty () || b[Y_AXIS].length () > y)
154 Stencil stil (fm->find_by_name ("brace" + to_string (lo)));
155 stil.translate_axis (-b[X_AXIS].length()/2, X_AXIS);
160 ADD_INTERFACE (System_start_delimiter, "system-start-delimiter-interface",
161 "The brace, bracket or bar in front of the system. "
162 "It is implemented as a spanner.",