2 break-align-interface.cc -- implement Break_align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include <libc-extension.hh> // isinf
13 #include "self-alignment-interface.hh"
14 #include "side-position-interface.hh"
15 #include "axis-group-interface.hh"
17 #include "lily-guile.hh"
18 #include "break-align-interface.hh"
19 #include "dimensions.hh"
20 #include "paper-def.hh"
21 #include "paper-column.hh"
22 #include "group-interface.hh"
23 #include "align-interface.hh"
25 MAKE_SCHEME_CALLBACK (Break_align_interface,alignment_callback,2);
28 Break_align_interface::alignment_callback (SCM element_smob, SCM axis)
30 Grob *me = unsmob_grob (element_smob);
31 Axis a = (Axis) gh_scm2int (axis);
34 Grob *par = me->get_parent (a);
35 if (par && !to_boolean (par->get_grob_property ("break-alignment-done")))
37 par->set_grob_property ("break-alignment-done", SCM_BOOL_T);
38 Break_align_interface::do_alignment (par);
41 return gh_double2scm (0);
44 MAKE_SCHEME_CALLBACK (Break_align_interface,self_align_callback,2);
46 Break_align_interface::self_align_callback (SCM element_smob, SCM axis)
48 Grob *me = unsmob_grob (element_smob);
49 Axis a = (Axis) gh_scm2int (axis);
52 Item* item = dynamic_cast<Item*> (me);
53 Direction bsd = item->break_status_dir ();
56 me->set_grob_property ("self-alignment-X", scm_int2num (RIGHT));
60 Force break alignment itself to be done first, in the case
62 return Self_alignment_interface::aligned_on_self (element_smob, axis);
66 Break_align_interface::add_element (Grob*me, Grob *toadd)
68 Axis_group_interface::add_element (me, toadd);
72 Break_align_interface::do_alignment (Grob *me)
74 Item * item = dynamic_cast<Item*> (me);
75 Link_array<Grob> elems
76 = Pointer_group_interface__extract_grobs (me, (Grob*)0,
78 Array<Interval> extents;
80 int last_nonempty = -1;
81 for (int i=0; i < elems.size (); i++)
83 Interval y = elems[i]->extent (elems[i], X_AXIS);
90 while (idx < extents.size () && extents[idx].empty_b ())
94 offsets.set_size (elems.size());
95 for (int i= 0; i < offsets.size();i ++)
99 Real extra_right_space = 0.0;
101 while (idx < elems.size())
103 int next_idx = idx+1;
104 while (next_idx < elems.size() &&
105 extents[next_idx].empty_b()
109 Grob *l = elems[idx];
112 if (next_idx < elems.size())
119 Find the first grob with a space-alist entry.
121 for (SCM s= l->get_grob_property ("elements");
122 gh_pair_p (s) ; s = gh_cdr (s))
124 Grob *elt = unsmob_grob (gh_car (s));
127 && elt->get_grob_property ("break-align-symbol")
128 == ly_symbol2scm( "left-edge"))
131 SCM l =elt->get_grob_property ("space-alist");
139 SCM rsym = r ? SCM_EOL : ly_symbol2scm ("right-edge");
142 We used to use #'cause to find out the symbol and the spacing
143 table, but that gets icky when that grob is suicided for some
146 for (SCM s = r ? r->get_grob_property ("elements") : SCM_EOL;
147 !gh_symbol_p (rsym) && gh_pair_p (s); s = gh_cdr (s))
149 Grob * elt =unsmob_grob(gh_car (s));
151 rsym = elt->get_grob_property ("break-align-symbol");
154 if (rsym == ly_symbol2scm("left-edge"))
158 if (gh_symbol_p (rsym))
159 entry = scm_assq (rsym, alist);
161 bool entry_found = gh_pair_p (entry);
165 if(gh_symbol_p (rsym))
166 sym_string = ly_symbol2string (rsym);
169 if (unsmob_grob (l->get_grob_property ("cause")))
170 orig_string = unsmob_grob (l->get_grob_property ("cause"))->name ();
172 programming_error (_f("No spacing entry from %s to `%s'",
173 orig_string.to_str0 (),
174 sym_string.to_str0 ()));
178 SCM type = ly_symbol2scm ("extra-space");
182 entry = gh_cdr (entry);
184 distance = gh_scm2double (gh_cdr (entry));
185 type = gh_car (entry) ;
190 if (type == ly_symbol2scm ("extra-space"))
191 offsets[next_idx] = extents[idx][RIGHT] + distance;
192 else if (type == ly_symbol2scm("minimum-space"))
193 offsets[next_idx] = extents[idx][RIGHT] >? distance;
197 extra_right_space = distance;
204 Interval total_extent;
206 Real alignment_off =0.0;
207 for (int i =0 ; i < offsets.size(); i++)
211 alignment_off = -here;
212 total_extent.unite (extents[i] + here);
216 if (item->break_status_dir () == LEFT)
218 alignment_off = - total_extent[RIGHT] - extra_right_space;
220 else if (edge_idx < 0)
221 alignment_off = -total_extent[LEFT];
223 here = alignment_off;
224 for (int i =0 ; i < offsets.size(); i++)
227 elems[i]->translate_axis (here, X_AXIS);
232 ADD_INTERFACE (Break_aligned_interface, "break-aligned-interface",
234 "Items that are aligned in prefatory matter.\n"
236 "The spacing of these items is controlled by the space-alist\n"
237 "property. It contains a list break-align-symbols with a specification\n"
238 "of the associated space. The space definition is either (extra-space\n"
239 ". @var{number}), which adds space after the symbol, (minimum-space\n"
240 ". @var{ms}), which pads the space until it it is @var{ms}.\n"
243 "Special keys for the alist are 'first-note and 'next-note, signifyign\n"
244 "the first note on a line, and the next note halfway a line.\n"
246 "Rules for this spacing are much more complicated than this. \n"
247 "See [Wanske] page 126 -- 134, [Ross] pg 143 -- 147\n",
248 "break-align-symbol break-alignment-done space-alist");
250 ADD_INTERFACE (Break_align_interface, "break-alignment-interface",
251 "See @ref{break-aligned-interface}.",
252 "break-alignment-done");