2 align-interface.cc -- implement Align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "align-interface.hh"
12 #include "group-interface.hh"
13 #include "axis-group-interface.hh"
14 #include "paper-def.hh"
16 MAKE_SCHEME_CALLBACK (Align_interface,alignment_callback,2);
18 Align_interface::alignment_callback (SCM element_smob, SCM axis)
20 Grob * me = unsmob_grob (element_smob);
21 Axis ax = (Axis)gh_scm2int (axis);
22 Grob * par = me->parent_l (ax);
23 if (par && !to_boolean (par->get_grob_property ("alignment-done")))
25 Align_interface::align_elements_to_extents (par, ax);
27 return gh_double2scm (0.0);
30 MAKE_SCHEME_CALLBACK (Align_interface,fixed_distance_alignment_callback,2);
32 Align_interface::fixed_distance_alignment_callback (SCM element_smob, SCM axis)
34 Grob * me = unsmob_grob (element_smob);
35 Axis ax = (Axis)gh_scm2int (axis);
36 Grob * par = me->parent_l (ax);
37 if (par && !to_boolean (par->get_grob_property ("alignment-done")))
39 Align_interface::align_to_fixed_distance (par, ax);
41 return gh_double2scm (0.0);
45 merge with align-to-extents?
48 Align_interface::align_to_fixed_distance (Grob *me , Axis a)
50 me->set_grob_property ("alignment-done", SCM_BOOL_T);
52 SCM d = me->get_grob_property ("stacking-dir");
55 Direction stacking_dir = gh_number_p (d) ? to_dir (d) : CENTER;
60 SCM force = me->get_grob_property ("forced-distance");
63 if (gh_number_p (force))
65 dy = gh_scm2double (force);
68 Link_array<Grob> elems
69 = Pointer_group_interface__extract_elements (me, (Grob*) 0, "elements");
75 Array<Real> translates;
77 for (int j=0 ; j < elems.size (); j++)
79 where_f += stacking_dir * dy;
80 translates.push (where_f);
81 v.unite (Interval (where_f, where_f));
85 TODO: support self-alignment-{Y,X}
87 for (int i = 0; i < translates.size (); i++)
89 elems[i]->translate_axis (translates[i] - v.center (), a);
94 Hairy function to put elements where they should be. Can be tweaked
95 from the outside by setting minimum-space and extra-space in its
98 We assume that the children the refpoints of the children are still
99 found at 0.0 -- we will fuck up with thresholds if children's
100 extents are already moved to locations such as (-16, -8), since the
101 dy needed to put things in a row doesn't relate to the distances
102 between original refpoints.
104 TODO: maybe we should rethink and throw out thresholding altogether.
105 The original function has been taken over by
106 align_to_fixed_distance().
109 Align_interface::align_elements_to_extents (Grob * me, Axis a)
111 me->set_grob_property ("alignment-done", SCM_BOOL_T);
113 SCM d = me->get_grob_property ("stacking-dir");
116 Direction stacking_dir = gh_number_p (d) ? to_dir (d) : CENTER;
122 Interval threshold = Interval (0, Interval::infinity ());
123 SCM thr = me->get_grob_property ("threshold");
126 threshold[SMALLER] = gh_scm2double (ly_car (thr));
127 threshold[BIGGER] = gh_scm2double (ly_cdr (thr));
131 Array<Interval> dims;
133 Link_array<Grob> elems;
134 Link_array<Grob> all_grobs
135 = Pointer_group_interface__extract_elements (me, (Grob*) 0, "elements");
136 for (int i=0; i < all_grobs.size (); i++)
138 Interval y = all_grobs[i]->extent (me, a);
141 Grob *e =dynamic_cast<Grob*> (all_grobs[i]);
143 // todo: fucks up if item both in Halign & Valign.
144 SCM min_dims = e->remove_grob_property ("minimum-space");
145 if (gh_pair_p (min_dims) &&
146 gh_number_p (ly_car (min_dims))
147 && gh_number_p (ly_cdr (min_dims)))
149 y.unite (ly_scm2interval (min_dims));
152 SCM extra_dims = e->remove_grob_property ("extra-space");
153 if (gh_pair_p (extra_dims) &&
154 gh_number_p (ly_car (extra_dims))
155 && gh_number_p (ly_cdr (extra_dims)))
157 y[LEFT] += gh_scm2double (ly_car (extra_dims));
158 y[RIGHT] += gh_scm2double (ly_cdr (extra_dims));
168 Read self-alignment-X and self-alignment-Y. This may seem like
169 code duplication. (and really: it is), but this is necessary to
170 prevent ugly cyclic dependencies that arise when you combine
171 self-alignment on a child with alignment of children.
174 String s ("self-alignment-");
176 s += (a == X_AXIS) ? "X" : "Y";
178 SCM align (me->get_grob_property (s.ch_C ()));
180 Array<Real> translates ;
184 for (int j=0 ; j < elems.size (); j++)
186 Real dy = - dims[j][-stacking_dir];
188 dy += dims[j-1][stacking_dir];
197 dy = (dy >? threshold[SMALLER])
198 <? threshold[BIGGER];
201 where_f += stacking_dir * dy;
202 total.unite (dims[j] + where_f);
203 translates.push (where_f);
207 Grob * align_center = unsmob_grob (align);
208 Real center_offset = 0.0;
211 also move the grobs that were empty, to maintain spatial order.
213 Array<Real> all_translates;
214 if (translates.size ())
218 Real w = translates[0];
219 while (j < all_grobs.size ())
221 if (i < elems.size () && all_grobs[j] == elems[i])
225 if (all_grobs[j] == align_center)
227 all_translates .push (w);
233 FIXME: uncommenting freaks out the Y-alignment of
236 // Real align_param = isdir_b (align) ? gh_scm2double (align) : 0.0;
238 if (gh_number_p (align))
239 center_offset = total.linear_combination (gh_scm2double (align));
241 for (int j = 0 ; j < all_grobs.size (); j++)
242 all_grobs[j]->translate_axis (all_translates[j] - center_offset, a);
246 Align_interface::axis (Grob*me)
248 return Axis (gh_scm2int (ly_car (me->get_grob_property ("axes"))));
253 should use generic Scm funcs.
256 Align_interface::get_count (Grob*me,Grob*s)
258 SCM e = me->get_grob_property ("elements");
260 while (gh_pair_p (e))
262 if (ly_car (e) == s->self_scm ())
271 Align_interface::add_element (Grob*me,Grob* s, SCM cb)
273 s->add_offset_callback (cb, Align_interface::axis (me));
274 Axis_group_interface::add_element (me, s);
279 Align_interface::set_interface (Grob*me)
281 me->set_interface (ly_symbol2scm ("align-interface"));
283 Axis_group_interface::set_interface (me);
287 Align_interface::set_axis (Grob*me,Axis a)
289 Axis_group_interface::set_axes (me, a,a);
293 Align_interface::has_interface (Grob*me)
295 return me && me->has_interface (ly_symbol2scm ("align-interface"));