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.
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_realvar (interline_scm_sym);
37 Link_array<Score_element> elems;
38 for (int i=0; i < elem_l_arr_.size(); i++)
40 Interval y = elem_l_arr_[i]->extent(axis ());
42 elems.push (dynamic_cast<Score_element*> (elem_l_arr_[i]));
48 SCM symbol_list = SCM_EOL;
50 SCM current_origin = ly_ch_C_to_scm ("");
51 for (int i=0; i <= elems.size (); i++)
53 Score_element *next_elt = i < elems.size ()
61 next_origin = next_elt->get_elt_property (origin_scm_sym);
63 (next_origin == SCM_BOOL_F)
65 : SCM_CDR (next_origin);
68 next_origin = ly_ch_C_to_scm ("begin-of-note");
71 = scm_eval (scm_listify (ly_symbol ("break-align-spacer"),
72 current_origin, next_origin, SCM_UNDEFINED));
73 SCM symbol = SCM_CAR (extra_space);
74 Real spc = gh_scm2double (SCM_CADR(extra_space));
78 symbol_list = gh_cons (symbol, symbol_list);
79 current_origin = next_origin;
83 // skip the first sym.
84 symbol_list = SCM_CDR (scm_reverse (symbol_list));
85 for (int i=0; i <elems.size()-1; i++)
87 elems[i]->set_elt_property (SCM_CAR (symbol_list),
88 scm_cons (gh_double2scm (0),
89 gh_double2scm (dists[i+1])));
91 symbol_list = SCM_CDR (symbol_list);
96 SCM first_pair = elems[0]->get_elt_property (minimum_space_scm_sym);
97 if (first_pair == SCM_BOOL_F)
98 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
100 first_pair = SCM_CDR (first_pair);
102 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
103 elems[0]->set_elt_property (minimum_space_scm_sym, first_pair);
105 Axis_align_item::do_pre_processing();
108 Real pre_space = elems[0]->extent (X_AXIS)[LEFT]
109 + elems[0]->relative_coordinate (column_l (), X_AXIS);
110 Real spring_len = elems.top ()->extent (X_AXIS)[RIGHT]
111 + elems.top ()->relative_coordinate (column_l (), X_AXIS);
113 Real stretch_distance =0.;
115 if (SCM_CAR (symbol_list) == extra_space_scm_sym)
117 spring_len += dists.top ();
118 stretch_distance = dists.top ();
120 else if (SCM_CAR (symbol_list) == minimum_space_scm_sym)
122 spring_len = spring_len >? dists.top ();
123 stretch_distance = spring_len;
127 Hint the spacing engine how much space to put in.
130 The pairs are in the format of an interval (ie. CAR < CDR).
132 column_l ()->set_elt_property (extra_space_scm_sym,
133 scm_cons (gh_double2scm (pre_space),
134 gh_double2scm (spring_len)));
136 column_l ()->set_elt_property (stretch_distance_scm_sym,
137 gh_cons (gh_double2scm (-dists[0]),
138 gh_double2scm (stretch_distance)));
144 Break_align_item::Break_align_item ()
146 stacking_dir_ = RIGHT;
151 Break_align_item::add_breakable_item (Item *it)
153 SCM pr = it->remove_elt_property (break_priority_scm_sym);
155 if (pr == SCM_BOOL_F)
158 int priority = gh_scm2int (SCM_CDR (pr));
160 Score_element * column_l = get_elt_by_priority (priority);
161 Axis_group_item * hg=0;
164 hg = dynamic_cast<Axis_group_item*> (column_l);
168 hg = new Axis_group_item;
169 hg->set_axes (X_AXIS,X_AXIS);
172 this is quite ridiculous, but we do this anyway, to ensure that no
173 warning bells about missing Y refpoints go off later on.
175 hg->set_parent (this, Y_AXIS);
176 hg->set_elt_property (ly_symbol ("origin"), ly_ch_C_to_scm (it->name ()));
178 pscore_l_->typeset_element (hg);
179 add_element_priority (hg, priority);
185 hg->add_element (it);