2 break-align-interface.cc -- implement Break_align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include <libc-extension.hh> // isinf
13 #include "side-position-interface.hh"
14 #include "axis-group-interface.hh"
16 #include "lily-guile.hh"
17 #include "break-align-interface.hh"
18 #include "dimensions.hh"
19 #include "paper-def.hh"
20 #include "paper-column.hh"
21 #include "group-interface.hh"
22 #include "align-interface.hh"
24 MAKE_SCHEME_CALLBACK (Break_align_interface,alignment_callback,2);
27 Break_align_interface::alignment_callback (SCM element_smob, SCM axis)
29 Grob *me = unsmob_grob (element_smob);
30 Axis a = (Axis) gh_scm2int (axis);
33 Grob *par = me->get_parent (a);
34 if (par && !to_boolean (par->get_grob_property ("break-alignment-done")))
36 par->set_grob_property ("break-alignment-done", SCM_BOOL_T);
37 Break_align_interface::do_alignment (par);
40 return gh_double2scm (0);
43 MAKE_SCHEME_CALLBACK (Break_align_interface,self_align_callback,2);
45 Break_align_interface::self_align_callback (SCM element_smob, SCM axis)
47 Grob *me = unsmob_grob (element_smob);
48 Axis a = (Axis) gh_scm2int (axis);
51 Item* item = dynamic_cast<Item*> (me);
52 Direction bsd = item->break_status_dir ();
55 me->set_grob_property ("self-alignment-X", gh_int2scm (RIGHT));
59 Force break alignment itself to be done first, in the case
61 return Side_position_interface::aligned_on_self (element_smob, axis);
65 Break_align_interface::add_element (Grob*me, Grob *toadd)
67 Axis_group_interface::add_element (me, toadd);
71 Break_align_interface::set_interface (Grob*me)
73 Align_interface::set_interface (me);
74 Align_interface::set_axis (me,X_AXIS);
78 Break_align_interface::do_alignment (Grob *me)
80 Item * item = dynamic_cast<Item*> (me);
82 Link_array<Grob> elems
83 = Pointer_group_interface__extract_grobs (me, (Grob*)0,
85 Array<Interval> extents;
87 for (int i=0; i < elems.size (); i++)
89 Interval y = elems[i]->extent (elems[i], X_AXIS);
95 while (extents[idx].empty_b ())
99 offsets.set_size (elems.size());
100 for (int i= 0; i < offsets.size();i ++)
105 while (idx < elems.size())
107 int next_idx = idx+1;
108 while ( next_idx < elems.size() && extents[next_idx].empty_b())
111 if (next_idx == elems.size())
114 Grob *l = elems[idx];
115 Grob *r = elems[next_idx];
119 for (SCM s= l->get_grob_property ("elements");
120 gh_pair_p (s) ; s = gh_cdr (s))
122 Grob *elt = unsmob_grob (gh_car (s));
125 && elt->get_grob_property ("break-align-symbol") == ly_symbol2scm( "left-edge"))
128 SCM l =elt->get_grob_property ("space-alist");
139 We used to use #'cause to find out the symbol and the spacing
140 table, but that gets icky when that grob is suicided for some
143 for (SCM s = r->get_grob_property ("elements");
144 gh_pair_p (s); s = gh_cdr (s))
146 Grob * elt =unsmob_grob(gh_car (s));
148 SCM sym = elt->get_grob_property ("break-align-symbol");
149 if (gh_symbol_p (sym))
155 if (rsym == ly_symbol2scm("left-edge"))
159 if (gh_symbol_p (rsym))
160 entry = scm_assq (rsym, alist);
162 bool entry_found = gh_pair_p (entry);
166 if(gh_symbol_p(rsym))
167 sym_str = ly_symbol2string (rsym);
170 if (unsmob_grob (l->get_grob_property ("cause")))
171 orig_str = unsmob_grob (l->get_grob_property ("cause"))->name ();
173 programming_error (_f("No spacing entry from %s to `%s'",
179 SCM type = ly_symbol2scm ("extra-space");
183 entry = gh_cdr (entry);
185 distance = gh_scm2double (gh_cdr (entry));
186 type = gh_car (entry) ;
189 if (type == ly_symbol2scm ("extra-space"))
190 offsets[next_idx] = extents[idx][RIGHT] + distance;
191 else if (type == ly_symbol2scm("minimum-space"))
192 offsets[next_idx] = extents[idx][RIGHT] >? distance;
199 Interval total_extent;
201 Real alignment_off =0.0;
202 for (int i =0 ; i < offsets.size(); i++)
206 alignment_off = -here;
207 total_extent.unite (extents[i] + here);
211 if (item->break_status_dir () == LEFT)
212 alignment_off = -total_extent[RIGHT];
213 else if (edge_idx < 0)
214 alignment_off = -total_extent[LEFT];
216 here = alignment_off;
217 for (int i =0 ; i < offsets.size(); i++)
220 elems[i]->translate_axis (here, X_AXIS);