2 span-bar.cc -- implement Span_bar
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "font-interface.hh"
12 #include "dimensions.hh"
13 #include "output-def.hh"
16 #include "axis-group-interface.hh"
17 #include "bar-line.hh"
19 #include "pointer-group-interface.hh"
22 Span_bar::add_bar (Grob *me, Grob *b)
24 Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), b);
27 MAKE_SCHEME_CALLBACK (Span_bar, print, 1);
31 (1) Elements from 'me->get_object ("elements")' must be
32 ordered according to their y coordinates relative to their common
33 axis group parent. Otherwise, the computation goes mad.
35 (2) This method depends on bar_engraver not being removed from
36 staff context. If bar_engraver is removed, the size of the staff
37 lines is evaluated as 0, which results in a solid span bar line
38 with faulty y coordinate. */
40 /* This routine was originally by Juergen Reuter, but it was a on the
41 bulky side. Rewritten by Han-Wen. */
43 Span_bar::print (SCM smobbed_me)
45 Grob *me = unsmob_grob (smobbed_me);
46 extract_grob_set (me, "elements", elements);
47 Grob *refp = common_refpoint_of_array (elements, me, Y_AXIS);
49 SCM glyph = me->get_property ("glyph-name");
51 /* glyph may not be a string, when ME is killed by Hara Kiri in
53 if (!scm_is_string (glyph))
56 String glyph_string = ly_scm2string (glyph);
58 /* compose span_bar_mol */
59 Array<Interval> extents;
61 for (int i = elements.size (); i--;)
63 Grob *bar = elements[i];
64 Interval ext = bar->extent (refp, Y_AXIS);
75 extents.sort (&Interval::left_comparison);
78 for (int i = 1; i < extents.size (); i++)
80 Interval prev_extent = extents[i - 1];
81 Interval ext = extents[i];
82 if (!prev_extent.is_empty ())
84 Interval l (prev_extent [UP],
89 /* There is overlap between the bar lines. Do nothing. */
93 Stencil interbar = Bar_line::compound_barline (model_bar,
97 interbar.translate_axis (l.center (), Y_AXIS);
98 span_bar.add_stencil (interbar);
104 span_bar.translate_axis (- me->relative_coordinate (refp, Y_AXIS),
107 return span_bar.smobbed_copy ();
110 MAKE_SCHEME_CALLBACK (Span_bar, width_callback, 2);
112 Span_bar::width_callback (SCM smob, SCM scm_axis)
114 Grob *me = unsmob_grob (smob);
117 assert ((Axis) scm_to_int (scm_axis) == X_AXIS);
118 SCM gn = me->get_property ("glyph-name");
120 return ly_interval2scm (Interval ());
122 String gl = ly_scm2string (gn);
127 Stencil m = Bar_line::compound_barline (me, gl, 40 PT, false);
129 return ly_interval2scm (m.extent (X_AXIS));
132 MAKE_SCHEME_CALLBACK (Span_bar, before_line_breaking, 1);
134 Span_bar::before_line_breaking (SCM smob)
136 Grob *me = unsmob_grob (smob);
137 extract_grob_set (me, "elements", elements);
138 if (elements.is_empty ())
141 return SCM_UNSPECIFIED;
144 MAKE_SCHEME_CALLBACK (Span_bar, center_on_spanned_callback, 2);
147 Span_bar::center_on_spanned_callback (SCM element_smob, SCM axis)
149 Grob *me = unsmob_grob (element_smob);
151 assert (scm_to_int (axis) == Y_AXIS);
152 Interval i (get_spanned_interval (me));
154 /* Bar_line::print delivers a barline of y-extent (-h/2, h/2), so
155 we have to translate ourselves to be in the center of the
156 interval that we span. */
160 return scm_from_double (0.0);
163 return scm_from_double (i.center ());
168 MAKE_SCHEME_CALLBACK(Span_bar, calc_glyph_name, 1);
170 Span_bar::calc_glyph_name (SCM smob)
172 Grob *me = unsmob_grob (smob);
173 extract_grob_set (me, "elements", elements);
175 for (int i = elements.size ();
176 i-- && !scm_is_string (gl);)
177 gl = elements[i]->get_property ("glyph");
179 if (!scm_is_string (gl))
182 return SCM_UNSPECIFIED;
185 String type = ly_scm2string (gl);
188 else if (type == ":|")
190 else if (type == ":|:")
193 return scm_makfrom0str (type.to_str0 ());
197 Span_bar::get_spanned_interval (Grob *me)
199 return ly_scm2interval (Axis_group_interface::group_extent_callback
200 (me->self_scm (), scm_from_int (Y_AXIS)));
203 MAKE_SCHEME_CALLBACK (Span_bar, calc_bar_size, 1);
205 Span_bar::calc_bar_size (SCM smob)
207 Grob *me = unsmob_grob (smob);
208 Interval iv (get_spanned_interval (me));
211 /* This happens if the bars are hara-kiried from under us. */
213 return scm_from_double (-1);
215 return scm_from_double (iv.length ());
218 ADD_INTERFACE (Span_bar, "span-bar-interface",
219 "A bar line that spanned between other barlines. This interface is "
220 " used for bar lines that connect different staves.",