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,1);
44 Span_bar::before_line_breaking (SCM smob)
46 evaluate_empty (unsmob_element (smob));
47 evaluate_glyph (unsmob_element (smob));
50 no need to call Bar::before_line_breaking (), because the info
51 in ELEMENTS already has been procced by Bar::before_line_breaking().
53 return SCM_UNSPECIFIED;
56 MAKE_SCHEME_CALLBACK(Span_bar,center_on_spanned_callback,2);
58 Span_bar::center_on_spanned_callback (SCM element_smob, SCM axis)
60 Score_element *me = unsmob_element (element_smob);
61 Axis a = (Axis) gh_scm2int (axis);
63 Interval i (get_spanned_interval (me));
66 Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
67 we have to translate ourselves to be in the center of the
68 interval that we span. */
70 return gh_double2scm (i.center ());
74 Span_bar::evaluate_empty (Score_element*me)
77 TODO: filter all hara-kiried out of ELEMENS list, and then
78 optionally do suicide. Call this cleanage function from
79 center_on_spanned_callback() as well.
82 if (!gh_pair_p (me->get_elt_property ("elements")))
89 Span_bar::evaluate_glyph (Score_element*me)
91 SCM elts = me->get_elt_property ("elements");
92 Score_element * b = unsmob_element (gh_car (elts));
93 SCM glsym =ly_symbol2scm ("glyph");
94 SCM gl =b ->get_elt_property (glsym);
95 if (!gh_string_p (gl))
101 String type = ly_scm2string (gl);
107 else if (type== ":|")
111 else if (type== ":|:")
116 gl = ly_str02scm (type.ch_C());
117 if (scm_equal_p (me->get_elt_property (glsym), gl) != SCM_BOOL_T)
118 me->set_elt_property (glsym, gl);
122 Span_bar::get_spanned_interval (Score_element*me)
124 return Axis_group_interface::group_extent_callback (me, Y_AXIS);
128 MAKE_SCHEME_CALLBACK(Span_bar,get_bar_size,1);
130 Span_bar::get_bar_size (SCM smob)
132 Score_element* me = unsmob_element (smob);
133 Interval iv (get_spanned_interval (me));
137 This happens if the bars are hara-kiried from under us.
140 return gh_double2scm (-1);
142 return gh_double2scm (iv.length ());
146 Span_bar::set_interface (Score_element *me)
148 Bar::set_interface (me);
150 Pointer_group_interface(me).set_interface ();
151 me->set_extent_callback (width_callback, X_AXIS);
152 me->add_offset_callback (Span_bar_center_on_spanned_callback_proc, Y_AXIS);
153 me->set_interface (ly_symbol2scm ("span-bar-interface"));
154 me->set_extent_callback (0, Y_AXIS);
158 Span_bar::has_interface (Score_element*m)
160 return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));