2 break-align-item.cc -- implement Break_align_item
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "dimension-cache.hh"
10 #include "lily-guile.hh"
11 #include "break-align-item.hh"
12 #include "dimensions.hh"
13 #include "paper-score.hh"
14 #include "paper-def.hh"
15 #include "paper-column.hh"
18 Handle spacing for prefatory matter.
20 TODO: rewrite this. It is kludgy
24 Break_align_item::do_pre_processing()
26 if (break_status_dir() == LEFT)
33 Real interline= paper_l ()->get_var ("interline");
35 Link_array<Score_element> elems;
36 for (int i=0; i < elem_l_arr_.size(); i++)
38 Interval y = elem_l_arr_[i]->extent(axis ());
40 elems.push (dynamic_cast<Score_element*> (elem_l_arr_[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 = SCM_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 = SCM_CDR (scm_reverse (symbol_list));
83 for (int i=0; i <elems.size()-1; i++)
85 String sym_str = ly_scm2string (SCM_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 = SCM_CDR (symbol_list);
95 SCM first_pair = elems[0]->get_elt_property ("minimum-space");
96 if (first_pair == SCM_UNDEFINED)
97 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
99 first_pair = first_pair;
101 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
102 elems[0]->set_elt_property ("minimum-space", first_pair);
104 Axis_align_item::do_pre_processing();
107 Real pre_space = elems[0]->extent (X_AXIS)[LEFT]
108 + elems[0]->relative_coordinate (column_l (), X_AXIS);
109 Real spring_len = elems.top ()->extent (X_AXIS)[RIGHT]
110 + elems.top ()->relative_coordinate (column_l (), X_AXIS);
112 Real stretch_distance =0.;
114 if (SCM_CAR (symbol_list) == ly_symbol2scm ("extra-space"))
116 spring_len += dists.top ();
117 stretch_distance = dists.top ();
119 else if (SCM_CAR (symbol_list) == ly_symbol2scm ("minimum-space"))
121 spring_len = spring_len >? dists.top ();
122 stretch_distance = spring_len;
126 Hint the spacing engine how much space to put in.
129 The pairs are in the format of an interval (ie. CAR < CDR).
131 column_l ()->set_elt_property ("extra-space",
132 scm_cons (gh_double2scm (pre_space),
133 gh_double2scm (spring_len)));
135 column_l ()->set_elt_property ("stretch-distance",
136 gh_cons (gh_double2scm (-dists[0]),
137 gh_double2scm (stretch_distance)));
141 Break_align_item::Break_align_item ()
143 stacking_dir_ = RIGHT;