2 break-align-item.cc -- implement Break_align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include <libc-extension.hh>
13 #include "side-position-interface.hh"
14 #include "axis-group-interface.hh"
16 #include "lily-guile.hh"
17 #include "break-align-item.hh"
18 #include "dimensions.hh"
19 #include "paper-def.hh"
20 #include "paper-column.hh"
21 #include "group-interface.hh"
22 #include "align-interface.hh"
24 MAKE_SCHEME_CALLBACK(Break_align_interface,before_line_breaking);
27 Break_align_interface::before_line_breaking (SCM smob)
29 Score_element* me = unsmob_element (smob);
31 return SCM_UNSPECIFIED;
35 Break_align_interface::alignment_callback (Score_element*c, Axis a)
38 Score_element *par = c->parent_l (a);
39 if (par && !to_boolean (par->get_elt_property ("break-alignment-done")))\
41 par->set_elt_property ("break-alignment-done", SCM_BOOL_T);
42 Break_align_interface::do_alignment (par);
49 Break_align_interface::self_align_callback (Score_element *me, Axis a)
53 Item* item = dynamic_cast<Item*> (me);
54 Direction bsd = item->break_status_dir();
57 me->set_elt_property ("self-alignment-X", gh_int2scm (RIGHT));
60 return Side_position::aligned_on_self (me, a);
64 Break_align_interface::add_element (Score_element*me, Score_element *toadd)
66 toadd->add_offset_callback (alignment_callback, X_AXIS);
67 Axis_group_interface::add_element (me, toadd);
71 Break_align_interface::do_alignment (Score_element *me)
73 Item * item = dynamic_cast<Item*> (me);
74 Item *column = item->column_l ();
76 Real interline= me->paper_l ()->get_var ("staffspace");
77 Link_array<Score_element> elems;
78 Link_array<Score_element> all_elems
79 = Pointer_group_interface__extract_elements (me, (Score_element*)0,
82 for (int i=0; i < all_elems.size(); i++)
84 Interval y = all_elems[i]->extent(X_AXIS);
86 elems.push (dynamic_cast<Score_element*> (all_elems[i]));
92 SCM symbol_list = SCM_EOL;
94 SCM current_origin = ly_symbol2scm ("none");
95 for (int i=0; i <= elems.size (); i++)
97 Score_element *next_elt = i < elems.size ()
105 next_origin = next_elt->get_elt_property ("break-align-symbol");
107 gh_symbol_p (next_origin)?
108 next_origin : ly_symbol2scm ("none")
112 next_origin = ly_symbol2scm ("begin-of-note");
114 SCM e = scm_assoc (scm_listify (current_origin,
117 scm_eval2 (ly_symbol2scm ("space-alist"), SCM_EOL));
122 extra_space = gh_cdr (e);
126 warning (_f ("unknown spacing pair `%s', `%s'",
127 ly_symbol2string (current_origin),
128 ly_symbol2string (next_origin)));
129 extra_space = scm_listify (ly_symbol2scm ("minimum-space"), gh_double2scm (0.0), SCM_UNDEFINED);
132 SCM symbol = gh_car (extra_space);
133 Real spc = gh_scm2double (gh_cadr(extra_space));
137 symbol_list = gh_cons (symbol, symbol_list);
138 current_origin = next_origin;
142 // skip the first sym.
143 symbol_list = gh_cdr (scm_reverse (symbol_list));
144 for (int i=0; i <elems.size()-1; i++)
146 elems[i]->set_elt_property (gh_car (symbol_list),
147 scm_cons (gh_double2scm (0),
148 gh_double2scm (dists[i+1])));
150 symbol_list = gh_cdr (symbol_list);
155 SCM first_pair = elems[0]->get_elt_property ("minimum-space");
156 if (gh_pair_p (first_pair))
157 first_pair = first_pair;
159 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
161 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
162 elems[0]->set_elt_property ("minimum-space", first_pair);
166 Force callbacks for alignment to be called
168 Align_interface::do_side_processing (me, X_AXIS);
170 Real pre_space = elems[0]->relative_coordinate (column, X_AXIS);
172 Real xl = elems[0]->extent (X_AXIS)[LEFT];
176 programming_error ("Infinity reached. ");
178 Real xr = elems.top ()->extent (X_AXIS)[RIGHT];
179 Real spring_len = elems.top ()->relative_coordinate (column, X_AXIS);
183 programming_error ("Infinity reached.");
185 Real stretch_distance =0.;
187 if (gh_car (symbol_list) == ly_symbol2scm ("extra-space"))
189 spring_len += dists.top ();
190 stretch_distance = dists.top ();
192 else if (gh_car (symbol_list) == ly_symbol2scm ("minimum-space"))
194 spring_len = spring_len >? dists.top ();
195 stretch_distance = spring_len;
199 Hint the spacing engine how much space to put in.
201 The pairs are in the format of an interval (ie. CAR < CDR).
203 column->set_elt_property ("extra-space",
204 scm_cons (gh_double2scm (pre_space),
205 gh_double2scm (spring_len)));
207 column->set_elt_property ("stretch-distance",
208 gh_cons (gh_double2scm (-dists[0]),
209 gh_double2scm (stretch_distance)));
216 Break_align_interface::set_interface (Score_element*me)
218 Align_interface::set_interface (me);
219 Align_interface::set_axis (me,X_AXIS);
221 me->add_offset_callback (Break_align_interface::self_align_callback, X_AXIS);