2 break-align-item.cc -- implement Break_align_item
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "side-position-interface.hh"
12 #include "dimension-cache.hh"
13 #include "lily-guile.hh"
14 #include "break-align-item.hh"
15 #include "dimensions.hh"
16 #include "paper-score.hh"
17 #include "paper-def.hh"
18 #include "paper-column.hh"
19 #include "group-interface.hh"
20 #include "align-interface.hh"
23 Break_align_item::before_line_breaking ()
25 Direction ad = (break_status_dir() == LEFT) ? RIGHT : LEFT;
26 Real interline= paper_l ()->get_var ("interline");
28 set_elt_property ("self-alignment-X", gh_int2scm (ad));
31 Link_array<Score_element> elems;
32 Link_array<Score_element> all_elems
33 = Group_interface__extract_elements (this, (Score_element*)0,
36 for (int i=0; i < all_elems.size(); i++)
38 Interval y = all_elems[i]->extent(X_AXIS);
40 elems.push (dynamic_cast<Score_element*> (all_elems[i]));
46 SCM symbol_list = SCM_EOL;
48 SCM current_origin = ly_str02scm ("");
49 for (int i=0; i <= elems.size (); i++)
51 Score_element *next_elt = i < elems.size ()
59 next_origin = next_elt->get_elt_property ("origin");
61 (next_origin == SCM_UNDEFINED)
66 next_origin = ly_str02scm ("begin-of-note");
69 = scm_eval (scm_listify (ly_symbol2scm ("break-align-spacer"),
70 current_origin, next_origin, SCM_UNDEFINED));
71 SCM symbol = gh_car (extra_space);
72 Real spc = gh_scm2double (SCM_CADR(extra_space));
76 symbol_list = gh_cons (symbol, symbol_list);
77 current_origin = next_origin;
81 // skip the first sym.
82 symbol_list = gh_cdr (scm_reverse (symbol_list));
83 for (int i=0; i <elems.size()-1; i++)
85 String sym_str = ly_symbol2string (gh_car (symbol_list));
86 elems[i]->set_elt_property (sym_str,
87 scm_cons (gh_double2scm (0),
88 gh_double2scm (dists[i+1])));
90 symbol_list = gh_cdr (symbol_list);
95 SCM first_pair = elems[0]->get_elt_property ("minimum-space");
96 if (gh_pair_p (first_pair))
97 first_pair = first_pair;
99 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
101 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
102 elems[0]->set_elt_property ("minimum-space", first_pair);
106 Force callbacks for alignment to be called
108 Real unused = elems[0]->relative_coordinate (this, X_AXIS);
109 Real pre_space = elems[0]->relative_coordinate (column_l (), X_AXIS);
111 Real xl = elems[0]->extent (X_AXIS)[LEFT];
115 programming_error ("Infinity reached. ");
117 Real xr = elems.top ()->extent (X_AXIS)[RIGHT];
118 Real spring_len = elems.top ()->relative_coordinate (column_l (), X_AXIS);
122 programming_error ("Infinity reached.");
124 Real stretch_distance =0.;
126 if (gh_car (symbol_list) == ly_symbol2scm ("extra-space"))
128 spring_len += dists.top ();
129 stretch_distance = dists.top ();
131 else if (gh_car (symbol_list) == ly_symbol2scm ("minimum-space"))
133 spring_len = spring_len >? dists.top ();
134 stretch_distance = spring_len;
138 Hint the spacing engine how much space to put in.
141 The pairs are in the format of an interval (ie. CAR < CDR).
143 column_l ()->set_elt_property ("extra-space",
144 scm_cons (gh_double2scm (pre_space),
145 gh_double2scm (spring_len)));
147 column_l ()->set_elt_property ("stretch-distance",
148 gh_cons (gh_double2scm (-dists[0]),
149 gh_double2scm (stretch_distance)));
153 Break_align_item::Break_align_item ()
155 set_elt_property ("stacking-dir" , gh_int2scm (RIGHT));
157 Align_interface (this).set_interface ();
158 Align_interface (this).set_axis (X_AXIS);
160 add_offset_callback (Side_position_interface::aligned_on_self, X_AXIS);