2 system-start-delimiter.cc -- implement System_start_delimiter
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2006 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"
20 #include "line-interface.hh"
22 #include "pointer-group-interface.hh"
25 System_start_delimiter::staff_bracket (Grob *me, Real height)
27 SCM fam = scm_cons (ly_symbol2scm ("font-encoding"),
28 ly_symbol2scm ("fetaMusic"));
30 SCM alist = scm_list_n (fam, SCM_UNDEFINED);
31 Font_metric *fm = select_font (me->layout (), scm_list_n (alist, SCM_UNDEFINED));
33 Drul_array<Stencil> tips (fm->find_by_name ("brackettips.down"),
34 fm->find_by_name ("brackettips.up"));
36 Real thickness = robust_scm2double (me->get_property ("thickness"), 0.25);
38 Real overlap = 0.1 * thickness;
40 Box box (Interval (0, thickness),
42 * (height / 2 + overlap));
44 Stencil bracket = Lookup::filled_box (box);
47 bracket.add_at_edge (Y_AXIS, d, tips[d], -overlap, 0.0);
48 while (flip (&d) != DOWN);
49 bracket = Stencil (box, bracket.expr ());
51 bracket.translate_axis (-0.8, X_AXIS);
57 System_start_delimiter::line_bracket (Grob *me, Real height)
60 = me->layout ()->get_dimension (ly_symbol2scm ("linethickness"))
61 * robust_scm2double (me->get_property ("thickness"), 1);
64 Stencil tip1 = Line_interface::make_line (thick,
65 Offset (0, -height/2),
66 Offset (w, -height/2));
67 Stencil tip2 = Line_interface::make_line (thick,
69 Offset (w, height/2));
70 Stencil vline = Line_interface::make_line (thick,
71 Offset (0, -height/2),
72 Offset (0, height/2));
74 vline.add_stencil (tip1);
75 vline.add_stencil (tip2);
76 vline.translate_axis (-w, X_AXIS);
81 System_start_delimiter::simple_bar (Grob *me, Real h)
83 Real lt = me->layout ()->get_dimension (ly_symbol2scm ("linethickness"));
84 Real w = lt * robust_scm2double (me->get_property ("thickness"), 1);
85 return Lookup::round_filled_box (Box (Interval (0, w), Interval (-h / 2, h / 2)),
89 MAKE_SCHEME_CALLBACK (System_start_delimiter, print, 1);
91 System_start_delimiter::print (SCM smob)
93 Spanner *me = unsmob_spanner (smob);
94 extract_grob_set (me, "elements", elts);
95 Grob *common = common_refpoint_of_array (elts, me, Y_AXIS);
98 int non_empty_count = 0;
99 for (vsize i = elts.size (); i--;)
101 Spanner *sp = dynamic_cast<Spanner *> (elts[i]);
104 && sp->get_bound (LEFT) == me->get_bound (LEFT))
106 Interval dims = sp->extent (common, Y_AXIS);
107 if (!dims.is_empty ())
115 SCM glyph_sym = me->get_property ("style");
116 Real len = ext.length ();
118 || (robust_scm2double (me->get_property ("collapse-height"), 0.0) >= ext.length ())
119 || (glyph_sym == ly_symbol2scm ("bar-line")
120 && non_empty_count <= 1))
123 return SCM_UNSPECIFIED;
127 if (glyph_sym == ly_symbol2scm ("bracket"))
128 m = staff_bracket (me, len);
129 else if (glyph_sym == ly_symbol2scm ("brace"))
130 m = staff_brace (me, len);
131 else if (glyph_sym == ly_symbol2scm ("bar-line"))
132 m = simple_bar (me, len);
133 else if (glyph_sym == ly_symbol2scm ("line-bracket"))
134 m = line_bracket (me, len);
136 m.translate_axis (ext.center (), Y_AXIS);
137 return m.smobbed_copy ();
141 System_start_delimiter::staff_brace (Grob *me, Real y)
144 /* We go through the style sheet to lookup the font file
145 name. This is better than using find_font directly,
146 esp. because that triggers mktextfm for non-existent
148 SCM fam = scm_cons (ly_symbol2scm ("font-encoding"),
149 ly_symbol2scm ("fetaBraces"));
151 SCM alist = scm_list_n (fam, SCM_UNDEFINED);
152 fm = select_font (me->layout (), scm_list_n (alist, SCM_UNDEFINED));
155 int hi = max (fm->count () - 1, 2);
157 /* do a binary search for each Y, not very efficient, but passable? */
161 int cmp = (lo + hi) / 2;
162 b = fm->get_indexed_char (cmp);
163 if (b[Y_AXIS].is_empty () || b[Y_AXIS].length () > y)
170 Stencil stil (fm->find_by_name ("brace" + to_string (lo)));
171 stil.translate_axis (-b[X_AXIS].length()/2, X_AXIS);
173 stil.translate_axis (-0.2, X_AXIS);
178 ADD_INTERFACE (System_start_delimiter, "system-start-delimiter-interface",
179 "The brace, bracket or bar in front of the system. "