2 staff-symbol.cc -- implement Staff_symbol
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "staff-symbol.hh"
12 #include "dimensions.hh"
13 #include "output-def.hh"
16 #include "staff-symbol-referencer.hh"
19 MAKE_SCHEME_CALLBACK (Staff_symbol, print, 1);
22 Staff_symbol::print (SCM smob)
24 Grob *me = unsmob_grob (smob);
25 Spanner *sp = dynamic_cast<Spanner *> (me);
27 = sp->get_bound (LEFT)->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
29 Interval span_points (0, 0);
32 For raggedright without ragged staffs, simply set width to the linewidth.
34 (ok -- lousy UI, since width is in staff spaces)
38 Real t = me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
39 t *= robust_scm2double (me->get_property ("thickness"), 1.0);
44 SCM width_scm = me->get_property ("width");
45 if (d == RIGHT && scm_is_number (width_scm))
48 don't multiply by Staff_symbol_referencer::staff_space (me),
49 since that would make aligning staff symbols of different sizes to
50 one right margin hell.
52 span_points[RIGHT] = scm_to_double (width_scm);
56 Item *x = sp->get_bound (d);
58 span_points[d] = x->relative_coordinate (common, X_AXIS);
59 if (!x->break_status_dir ()
60 && !x->extent (x, X_AXIS).is_empty ())
61 span_points[d] += x->extent (x, X_AXIS)[d];
64 span_points[d] -= d* t / 2;
66 while (flip (&d) != LEFT);
68 int l = Staff_symbol::line_count (me);
70 Real height = (l - 1) * staff_space (me) / 2;
72 = Lookup::horizontal_line (span_points
73 -me->relative_coordinate (common, X_AXIS),
77 for (int i = 0; i < l; i++)
80 b.translate_axis (height - i * staff_space (me), Y_AXIS);
83 return m.smobbed_copy ();
87 Staff_symbol::get_steps (Grob *me)
89 return line_count (me) * 2;
93 Staff_symbol::line_count (Grob *me)
95 SCM c = me->get_property ("line-count");
96 if (scm_is_number (c))
97 return scm_to_int (c);
103 Staff_symbol::staff_space (Grob *me)
105 return robust_scm2double (me->get_property ("staff-space"), 1.0);
109 Staff_symbol::get_line_thickness (Grob *me)
111 Real lt = me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
113 return robust_scm2double (me->get_property ("thickness"), 1.0) * lt;
117 Staff_symbol::get_ledger_line_thickness (Grob *me)
119 SCM lt_pair = me->get_property ("ledger-line-thickness");
120 Offset z = robust_scm2offset (lt_pair, Offset (1.0, 0.1));
122 return z[X_AXIS] * get_line_thickness (me) + z[Y_AXIS] * staff_space (me);
125 ADD_INTERFACE (Staff_symbol, "staff-symbol-interface",
126 "This spanner draws the lines of a staff. "
127 "A staff symbol definines a vertical unit, the staff space. "
128 "Quantities that go by a half staff space are called positions "
129 "The center (i.e. middle line "
130 "or space) is position 0. The length of the symbol may be set by hand "
131 "through the @code{width} property. ",
133 "ledger-line-thickness width staff-space thickness line-count");