2 span-bar.cc -- implement Span_bar
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "dimensions.hh"
12 #include "paper-def.hh"
13 #include "molecule.hh"
15 #include "axis-group-interface.hh"
16 #include "group-interface.hh"
17 #include "score-element.hh"
21 Span_bar::add_bar (Score_element
*me
, Score_element
*b
)
23 Pointer_group_interface
gi (me
);
26 me
->add_dependency (b
);
30 Span_bar::width_callback (Score_element
*se
, Axis
)
32 String gl
= ly_scm2string (se
->get_elt_property ("glyph"));
37 Molecule m
= Bar::compound_barline (se
, gl
, 40 PT
);
39 return m
.extent (X_AXIS
);
42 MAKE_SCHEME_CALLBACK(Span_bar
,before_line_breaking
);
44 Span_bar::before_line_breaking (SCM smob
)
46 Bar::before_line_breaking (smob
);
48 evaluate_empty (unsmob_element (smob
));
50 return SCM_UNSPECIFIED
;
54 Span_bar::center_on_spanned_callback (Score_element
* me
, Axis a
)
57 Interval
i (get_spanned_interval (me
));
60 Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
61 we have to translate ourselves to be in the center of the
62 interval that we span. */
68 Span_bar::evaluate_empty (Score_element
*me
)
70 if (!gh_pair_p (me
->get_elt_property ("elements")))
75 SCM gl
= me
->get_elt_property ("glyph");
76 if (!gh_string_p (gl
))
82 String type_str
= ly_scm2string (gl
);
83 String orig
= type_str
;
88 else if (type_str
== ":|")
92 else if (type_str
== ":|:")
97 me
->set_elt_property ("glyph", ly_str02scm (type_str
.ch_C()));
102 Span_bar::get_spanned_interval (Score_element
*me
)
104 return Axis_group_interface::group_extent_callback (me
, Y_AXIS
);
108 MAKE_SCHEME_CALLBACK(Span_bar
,get_bar_size
);
110 Span_bar::get_bar_size (SCM smob
)
112 Score_element
* me
= unsmob_element (smob
);
113 Interval
iv (get_spanned_interval (me
));
116 programming_error("Huh? My children deflated (FIXME)");
119 return gh_double2scm (iv
.length ());
122 Span_bar::set_interface (Score_element
*me
)
124 Bar::set_interface (me
);
126 Pointer_group_interface(me
).set_interface ();
127 me
->set_extent_callback (width_callback
, X_AXIS
);
128 me
->add_offset_callback (center_on_spanned_callback
, Y_AXIS
);
129 me
->set_interface (ly_symbol2scm ("span-bar-interface"));
130 me
->set_extent_callback (0, Y_AXIS
);
134 Span_bar::has_interface (Score_element
*m
)
136 return m
&& m
->has_interface (ly_symbol2scm ("span-bar-interface"));