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>
11 #include "dimension-cache.hh"
12 #include "lily-guile.hh"
13 #include "break-align-item.hh"
14 #include "dimensions.hh"
15 #include "paper-score.hh"
16 #include "paper-def.hh"
17 #include "paper-column.hh"
20 Handle spacing for prefatory matter.
22 TODO: rewrite this. It is kludgy
26 Break_align_item::do_pre_processing()
28 if (break_status_dir() == LEFT)
35 Real interline= paper_l ()->get_var ("interline");
37 Link_array<Score_element> elems;
38 Link_array<Score_element> all_elems (elem_l_arr ());
40 for (int i=0; i < all_elems.size(); i++)
42 Interval y = all_elems[i]->extent(axis ());
44 elems.push (dynamic_cast<Score_element*> (all_elems[i]));
50 SCM symbol_list = SCM_EOL;
52 SCM current_origin = ly_str02scm ("");
53 for (int i=0; i <= elems.size (); i++)
55 Score_element *next_elt = i < elems.size ()
63 next_origin = next_elt->get_elt_property ("origin");
65 (next_origin == SCM_UNDEFINED)
70 next_origin = ly_str02scm ("begin-of-note");
73 = scm_eval (scm_listify (ly_symbol2scm ("break-align-spacer"),
74 current_origin, next_origin, SCM_UNDEFINED));
75 SCM symbol = gh_car (extra_space);
76 Real spc = gh_scm2double (SCM_CADR(extra_space));
80 symbol_list = gh_cons (symbol, symbol_list);
81 current_origin = next_origin;
85 // skip the first sym.
86 symbol_list = gh_cdr (scm_reverse (symbol_list));
87 for (int i=0; i <elems.size()-1; i++)
89 String sym_str = ly_symbol2string (gh_car (symbol_list));
90 elems[i]->set_elt_property (sym_str,
91 scm_cons (gh_double2scm (0),
92 gh_double2scm (dists[i+1])));
94 symbol_list = gh_cdr (symbol_list);
99 SCM first_pair = elems[0]->get_elt_property ("minimum-space");
100 if (gh_pair_p (first_pair))
101 first_pair = first_pair;
103 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
105 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
106 elems[0]->set_elt_property ("minimum-space", first_pair);
108 Axis_align_item::do_pre_processing();
111 Real pre_space = elems[0]->relative_coordinate (column_l (), X_AXIS);
113 Real xl = elems[0]->extent (X_AXIS)[LEFT];
117 programming_error ("Infinity reached. ");
119 Real xr = elems.top ()->extent (X_AXIS)[RIGHT];
120 Real spring_len = elems.top ()->relative_coordinate (column_l (), X_AXIS);
124 programming_error ("Infinity reached.");
126 Real stretch_distance =0.;
128 if (gh_car (symbol_list) == ly_symbol2scm ("extra-space"))
130 spring_len += dists.top ();
131 stretch_distance = dists.top ();
133 else if (gh_car (symbol_list) == ly_symbol2scm ("minimum-space"))
135 spring_len = spring_len >? dists.top ();
136 stretch_distance = spring_len;
140 Hint the spacing engine how much space to put in.
143 The pairs are in the format of an interval (ie. CAR < CDR).
145 column_l ()->set_elt_property ("extra-space",
146 scm_cons (gh_double2scm (pre_space),
147 gh_double2scm (spring_len)));
149 column_l ()->set_elt_property ("stretch-distance",
150 gh_cons (gh_double2scm (-dists[0]),
151 gh_double2scm (stretch_distance)));
155 Break_align_item::Break_align_item ()
157 stacking_dir_ = RIGHT;