2 span-bar.cc -- implement Span_bar
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "font-interface.hh"
11 #include "dimensions.hh"
12 #include "paper-def.hh"
13 #include "molecule.hh"
15 #include "axis-group-interface.hh"
16 #include "group-interface.hh"
21 Span_bar::add_bar (Grob*me, Grob*b)
23 Pointer_group_interface::add_element (me,"elements", b);
25 me->add_dependency (b);
28 MAKE_SCHEME_CALLBACK (Span_bar,brew_molecule,1);
33 * (1) Elements from 'me->get_grob_property ("elements")' must be
34 * ordered according to their y coordinates relative to their common
35 * axis group parent. Otherwise, the computation goes mad. (TODO:
36 * apply a sort algorithm that ensures this precondition.) However,
37 * until now, I have seen no case where lily has not fulfilled this
40 * (2) This method depends on bar_engraver not being removed from
41 * staff context. If bar_engraver is removed, the size of the staff
42 * lines is evaluated as 0, which results in a solid span bar line
43 * with faulty y coordinate.
47 Span_bar::brew_molecule (SCM smobbed_me)
49 Grob *me = unsmob_grob (smobbed_me);
50 Span_bar::evaluate_glyph(me);
51 SCM glyph = me->get_grob_property (ly_symbol2scm ("glyph"));
52 String glyph_str = ly_scm2string (glyph);
53 SCM first_elt = me->get_grob_property ("elements");
55 // first walk: compute axis_group parent via common_refpoint () on all bars
57 int staff_bar_count = 0;
58 for (SCM elts = first_elt;
62 SCM smobbed_staff_bar = gh_car (elts);
63 Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
64 refpoint = (staff_bar_count > 0) ?
65 staff_bar->common_refpoint (refpoint, Y_AXIS) :
69 /* assert: refpoint is an axis-group object */
70 Grob *axis_group = refpoint;
72 // second walk: collect span bar components;
73 // compute extent of axis_group
74 Real last_staff_bar_length;
75 Real *interstaff_bar_length = new Real[staff_bar_count];
76 Real *interstaff_bar_yoffs = new Real[staff_bar_count];
77 Molecule *interstaff_bar_molecule = new Molecule[staff_bar_count];
78 Real axis_group_extent = 0.0;
80 for (SCM elts = first_elt;
84 SCM smobbed_staff_bar = gh_car (elts);
85 SCM smobbed_staff_bar_molecule =
86 Bar::brew_molecule (smobbed_staff_bar);
87 Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
88 interstaff_bar_yoffs[staff_bar_count] =
89 staff_bar->relative_coordinate (axis_group, (Axis)Y_AXIS);
90 if (smobbed_staff_bar_molecule != SCM_EOL)
92 Real staff_bar_length =
93 unsmob_molecule (smobbed_staff_bar_molecule)->
94 extent (Y_AXIS).length ();
95 if (staff_bar_count > 0)
97 // clone bar_molecule and fix y extent
98 interstaff_bar_length[staff_bar_count] =
99 interstaff_bar_yoffs[staff_bar_count] -
100 interstaff_bar_yoffs[staff_bar_count - 1] -
101 last_staff_bar_length;
102 SCM smobbed_interstaff_bar_molecule =
103 Bar::compound_barline (staff_bar, glyph_str,
104 interstaff_bar_length[staff_bar_count]).
106 interstaff_bar_molecule[staff_bar_count] =
107 *unsmob_molecule (smobbed_interstaff_bar_molecule);
111 interstaff_bar_molecule[staff_bar_count] = Molecule::Molecule ();
113 last_staff_bar_length = staff_bar_length;
117 last_staff_bar_length = 0;
118 interstaff_bar_length[staff_bar_count] = 0;
119 interstaff_bar_molecule[staff_bar_count] = Molecule::Molecule ();
121 axis_group_extent += last_staff_bar_length;
122 axis_group_extent += interstaff_bar_length[staff_bar_count];
125 // assert(abs(axis_group_extent -
126 // axis_group->extent (axis_group, Y_AXIS).length ()) < EPSILON);
128 // third walk: correct y axis on all span bar components;
129 // put all components into a single span bar molecule
130 Molecule span_bar_molecule = Molecule::Molecule ();
132 for (SCM elts = first_elt;
134 elts = gh_cdr (elts))
136 interstaff_bar_yoffs[staff_bar_count] +=
137 (axis_group_extent - interstaff_bar_length[staff_bar_count]) / 2;
138 interstaff_bar_molecule[staff_bar_count].//DEBUG
139 translate_axis (-1.0 PT, X_AXIS);//DEBUG
140 interstaff_bar_molecule[staff_bar_count].
141 translate_axis (interstaff_bar_yoffs[staff_bar_count], Y_AXIS);
142 span_bar_molecule.add_molecule (interstaff_bar_molecule[staff_bar_count]);
147 delete interstaff_bar_length;
148 delete interstaff_bar_yoffs;
149 delete interstaff_bar_molecule;
150 return span_bar_molecule.smobbed_copy ();
153 MAKE_SCHEME_CALLBACK (Span_bar,width_callback,2);
155 Span_bar::width_callback (SCM element_smob, SCM scm_axis)
157 Grob *se = unsmob_grob (element_smob);
158 Axis a = (Axis) gh_scm2int (scm_axis);
159 assert (a == X_AXIS);
160 String gl = ly_scm2string (se->get_grob_property ("glyph"));
165 Molecule m = Bar::compound_barline (se, gl, 40 PT);
167 return ly_interval2scm (m.extent (X_AXIS));
170 MAKE_SCHEME_CALLBACK (Span_bar,before_line_breaking,1);
172 Span_bar::before_line_breaking (SCM smob)
174 evaluate_empty (unsmob_grob (smob));
175 evaluate_glyph (unsmob_grob (smob));
178 no need to call Bar::before_line_breaking (), because the info
179 in ELEMENTS already has been procced by Bar::before_line_breaking ().
181 return SCM_UNSPECIFIED;
184 MAKE_SCHEME_CALLBACK (Span_bar,center_on_spanned_callback,2);
187 Span_bar::center_on_spanned_callback (SCM element_smob, SCM axis)
189 Grob *me = unsmob_grob (element_smob);
190 Axis a = (Axis) gh_scm2int (axis);
191 assert (a == Y_AXIS);
192 Interval i (get_spanned_interval (me));
195 Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
196 we have to translate ourselves to be in the center of the
197 interval that we span. */
201 return gh_double2scm (0.0);
204 return gh_double2scm (i.center ());
208 Span_bar::evaluate_empty (Grob*me)
211 TODO: filter all hara-kiried out of ELEMENS list, and then
212 optionally do suicide. Call this cleanage function from
213 center_on_spanned_callback () as well.
216 if (!gh_pair_p (me->get_grob_property ("elements")))
223 Span_bar::evaluate_glyph (Grob*me)
225 SCM elts = me->get_grob_property ("elements");
226 Grob * b = unsmob_grob (gh_car (elts));
227 SCM glsym =ly_symbol2scm ("glyph");
228 SCM gl =b ->get_grob_property (glsym);
229 if (!gh_string_p (gl))
235 String type = ly_scm2string (gl);
241 else if (type== ":|")
245 else if (type== ":|:")
250 gl = ly_str02scm (type.ch_C ());
251 if (scm_equal_p (me->get_grob_property (glsym), gl) != SCM_BOOL_T)
252 me->set_grob_property (glsym, gl);
256 Span_bar::get_spanned_interval (Grob*me)
258 return ly_scm2interval (Axis_group_interface::group_extent_callback (me->self_scm (), gh_int2scm (Y_AXIS)));
262 MAKE_SCHEME_CALLBACK (Span_bar,get_bar_size,1);
264 Span_bar::get_bar_size (SCM smob)
266 Grob* me = unsmob_grob (smob);
267 Interval iv (get_spanned_interval (me));
271 This happens if the bars are hara-kiried from under us.
274 return gh_double2scm (-1);
276 return gh_double2scm (iv.length ());
280 Span_bar::set_interface (Grob *me)
282 Bar::set_interface (me);
284 me->set_interface (ly_symbol2scm ("span-bar-interface"));
285 me->set_extent_callback (SCM_EOL, Y_AXIS);
289 Span_bar::has_interface (Grob*m)
291 return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));