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,1);
27 Break_align_interface::before_line_breaking (SCM smob)
29 Score_element* me = unsmob_element (smob);
31 return SCM_UNSPECIFIED;
33 MAKE_SCHEME_CALLBACK(Break_align_interface,alignment_callback,2);
36 Break_align_interface::alignment_callback (SCM element_smob, SCM axis)
38 Score_element *me = unsmob_element (element_smob);
39 Axis a = (Axis) gh_scm2int (axis);
42 Score_element *par = me->parent_l (a);
43 if (par && !to_boolean (par->get_elt_property ("break-alignment-done")))\
45 par->set_elt_property ("break-alignment-done", SCM_BOOL_T);
46 Break_align_interface::do_alignment (par);
49 return gh_double2scm (0);
52 MAKE_SCHEME_CALLBACK(Break_align_interface,self_align_callback,2);
54 Break_align_interface::self_align_callback (SCM element_smob, SCM axis)
56 Score_element *me = unsmob_element (element_smob);
57 Axis a = (Axis) gh_scm2int (axis);
60 Item* item = dynamic_cast<Item*> (me);
61 Direction bsd = item->break_status_dir();
64 me->set_elt_property ("self-alignment-X", gh_int2scm (RIGHT));
67 return Side_position::aligned_on_self (element_smob, axis);
71 Break_align_interface::add_element (Score_element*me, Score_element *toadd)
73 Axis_group_interface::add_element (me, toadd);
77 Break_align_interface::do_alignment (Score_element *me)
79 Item * item = dynamic_cast<Item*> (me);
80 Item *column = item->column_l ();
82 Real interline= me->paper_l ()->get_var ("staffspace");
83 Link_array<Score_element> elems;
84 Link_array<Score_element> all_elems
85 = Pointer_group_interface__extract_elements (me, (Score_element*)0,
88 for (int i=0; i < all_elems.size(); i++)
90 Interval y = all_elems[i]->extent(all_elems[i], X_AXIS);
92 elems.push (dynamic_cast<Score_element*> (all_elems[i]));
98 SCM symbol_list = SCM_EOL;
100 SCM current_origin = ly_symbol2scm ("none");
101 for (int i=0; i <= elems.size (); i++)
103 Score_element *next_elt = i < elems.size ()
111 next_origin = next_elt->get_elt_property ("break-align-symbol");
113 gh_symbol_p (next_origin)?
114 next_origin : ly_symbol2scm ("none")
118 next_origin = ly_symbol2scm ("begin-of-note");
120 SCM alist = me->get_elt_property ("space-alist");
121 SCM e = scm_assoc (scm_listify (current_origin,
123 SCM_UNDEFINED), alist);
128 extra_space = gh_cdr (e);
132 warning (_f ("unknown spacing pair `%s', `%s'",
133 ly_symbol2string (current_origin),
134 ly_symbol2string (next_origin)));
135 extra_space = scm_listify (ly_symbol2scm ("minimum-space"), gh_double2scm (0.0), SCM_UNDEFINED);
138 SCM symbol = gh_car (extra_space);
139 Real spc = gh_scm2double (gh_cadr(extra_space));
143 symbol_list = gh_cons (symbol, symbol_list);
144 current_origin = next_origin;
148 // skip the first sym.
149 symbol_list = gh_cdr (scm_reverse (symbol_list));
150 for (int i=0; i <elems.size()-1; i++)
152 elems[i]->set_elt_property (gh_car (symbol_list),
153 scm_cons (gh_double2scm (0),
154 gh_double2scm (dists[i+1])));
156 symbol_list = gh_cdr (symbol_list);
161 SCM first_pair = elems[0]->get_elt_property ("minimum-space");
162 if (gh_pair_p (first_pair))
163 first_pair = first_pair;
165 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
167 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
168 elems[0]->set_elt_property ("minimum-space", first_pair);
172 Force callbacks for alignment to be called
174 Align_interface::do_side_processing (me, X_AXIS);
176 Real pre_space = elems[0]->relative_coordinate (column, X_AXIS);
178 Real xl = elems[0]->extent (elems[0],X_AXIS)[LEFT];
182 programming_error ("Infinity reached. ");
184 Real xr = elems.top ()->extent (elems.top (), X_AXIS)[RIGHT];
185 Real spring_len = elems.top ()->relative_coordinate (column, X_AXIS);
189 programming_error ("Infinity reached.");
191 Real stretch_distance =0.;
193 if (gh_car (symbol_list) == ly_symbol2scm ("extra-space"))
195 spring_len += dists.top ();
196 stretch_distance = dists.top ();
198 else if (gh_car (symbol_list) == ly_symbol2scm ("minimum-space"))
200 spring_len = spring_len >? dists.top ();
201 stretch_distance = spring_len;
205 Hint the spacing engine how much space to put in.
207 The pairs are in the format of an interval (ie. CAR < CDR).
209 column->set_elt_property ("extra-space",
210 scm_cons (gh_double2scm (pre_space),
211 gh_double2scm (spring_len)));
213 column->set_elt_property ("stretch-distance",
214 gh_cons (gh_double2scm (-dists[0]),
215 gh_double2scm (stretch_distance)));
220 Break_align_interface::set_interface (Score_element*me)
222 Align_interface::set_interface (me);
223 Align_interface::set_axis (me,X_AXIS);