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 "lily-guile.hh"
10 #include "break-align-item.hh"
11 #include "dimensions.hh"
13 #include "paper-def.hh"
18 Handle spacing for prefatory matter.
22 TODO: rewrite this. It is kludgy
26 Break_align_item::do_pre_processing()
28 align_dir_ = break_status_dir();
31 Real interline= paper_l ()->get_realvar (interline_scm_sym);
33 Link_array<Score_element> elems;
34 for (int i=0; i < elem_l_arr_.size(); i++)
36 Interval y = elem_l_arr_[i]->extent(axis ());
38 elems.push (dynamic_cast<Score_element*> (elem_l_arr_[i]));
46 SCM symbol_list = SCM_EOL;
48 SCM current_origin = gh_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_scm_sym);
61 (next_origin == SCM_BOOL_F)
63 : SCM_CDR (next_origin);
66 next_origin = gh_str02scm ("begin-of-note");
69 = scm_eval (scm_listify (ly_symbol ("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 elems[i]->set_elt_property (SCM_CAR (symbol_list),
86 scm_cons (gh_double2scm (0),
87 gh_double2scm (dists[i+1])));
89 symbol_list = SCM_CDR (symbol_list);
94 SCM first_pair = elems[0]->get_elt_property (minimum_space_scm_sym);
95 if (first_pair == SCM_BOOL_F)
96 first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
98 first_pair = SCM_CDR (first_pair);
100 scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
101 elems[0]->set_elt_property (minimum_space_scm_sym, first_pair);
105 Axis_align_item::do_pre_processing();
107 Real pre_space = elems[0]->extent (X_AXIS)[LEFT];
108 Real spring_len = elems.top ()->extent (X_AXIS)[RIGHT];
109 if (SCM_CAR (symbol_list) == extra_space_scm_sym)
111 spring_len += dists.top ();
113 else if (SCM_CAR (symbol_list) == minimum_space_scm_sym)
115 spring_len = spring_len >? dists.top ();
120 Hint the spacing engine how much space to put in.
122 column_l ()->set_elt_property (extra_space_scm_sym,
123 scm_cons (gh_double2scm (pre_space),
124 gh_double2scm (spring_len)));
129 Break_align_item::Break_align_item ()
131 stacking_dir_ = RIGHT;
136 Break_align_item::add_breakable_item (Item *it)
138 SCM pr = it->remove_elt_property (break_priority_scm_sym);
140 if (pr == SCM_BOOL_F)
143 int priority = gh_scm2int (SCM_CDR (pr));
145 Score_element * column_l = get_elt_by_priority (priority);
146 Axis_group_item * hg=0;
149 hg = dynamic_cast<Axis_group_item*> (column_l);
153 hg = new Axis_group_item;
154 hg->set_axes (X_AXIS,X_AXIS);
157 this is quite ridiculous, but we do this anyway, to ensure that no
158 warning bells about missing Y refpoints go off later on.
160 hg->dim_cache_[Y_AXIS]->parent_l_ = dim_cache_[Y_AXIS];
161 hg->set_elt_property (ly_symbol("origin"), gh_str02scm (it->name()));
163 pscore_l_->typeset_element (hg);
164 add_element_priority (hg, priority);
170 hg->add_element (it);