2 align-interface.cc -- implement Align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "align-interface.hh"
13 #include "axis-group-interface.hh"
14 #include "hara-kiri-group-spanner.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)scm_to_int (axis);
22 Grob *par = me->get_parent (ax);
23 if (par && !to_boolean (par->get_property ("positioning-done")))
25 Align_interface::align_elements_to_extents (par, ax);
27 return scm_make_real (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)scm_to_int (axis);
36 Grob *par = me->get_parent (ax);
37 if (par && !to_boolean (par->get_property ("positioning-done")))
39 Align_interface::align_to_fixed_distance (par, ax);
41 return scm_make_real (0.0);
45 merge with align-to-extents?
48 Align_interface::align_to_fixed_distance (Grob *me, Axis a)
50 me->set_property ("positioning-done", SCM_BOOL_T);
52 SCM d = me->get_property ("stacking-dir");
54 Direction stacking_dir = scm_is_number (d) ? to_dir (d) : CENTER;
58 Real dy = robust_scm2double (me->get_property ("forced-distance"), 0.0);
60 Link_array<Grob> elems
61 = extract_grob_array (me, ly_symbol2scm ("elements"));
67 Array<Real> translates;
69 for (int j = elems.size (); j--;)
72 This is not very elegant, in that we need special support for
73 hara-kiri. Unfortunately, the generic wiring of
74 force_hara_kiri_callback () (extent and offset callback) is
75 such that we might get into a loop if we call extent () or
76 offset () the elements.
81 && Hara_kiri_group_spanner::has_interface (elems[j]))
82 Hara_kiri_group_spanner::consider_suicide (elems[j]);
84 if (!elems[j]->is_live ())
88 for (int j = 0; j < elems.size (); j++)
90 where_f += stacking_dir * dy;
91 translates.push (where_f);
92 v.unite (Interval (where_f, where_f));
96 TODO: support self-alignment-{Y, X}
98 for (int i = 0; i < translates.size (); i++)
100 elems[i]->translate_axis (translates[i] - v.center (), a);
105 Hairy function to put elements where they should be. Can be tweaked
106 from the outside by setting extra-space in its
109 We assume that the children the refpoints of the children are still
110 found at 0.0 -- we will fuck up with thresholds if children's
111 extents are already moved to locations such as (-16, -8), since the
112 dy needed to put things in a row doesn't relate to the distances
113 between original refpoints.
115 TODO: maybe we should rethink and throw out thresholding altogether.
116 The original function has been taken over by
117 align_to_fixed_distance ().
120 Align_interface::align_elements_to_extents (Grob *me, Axis a)
122 Spanner *me_spanner = dynamic_cast<Spanner *> (me);
125 && me_spanner->get_bound (LEFT)->break_status_dir () == CENTER)
127 me_spanner->warning (_("vertical alignment called before line-breaking. Only do cross-staff spanners with PianoStaff."));
130 me->set_property ("positioning-done", SCM_BOOL_T);
132 SCM d = me->get_property ("stacking-dir");
134 Direction stacking_dir = scm_is_number (d) ? to_dir (d) : CENTER;
138 Interval threshold = robust_scm2interval (me->get_property ("threshold"),
139 Interval (0, Interval::infinity ()));
141 Array<Interval> dims;
143 Link_array<Grob> elems;
144 Link_array<Grob> all_grobs
145 = extract_grob_array (me, ly_symbol2scm ("elements"));
146 for (int i = 0; i < all_grobs.size (); i++)
148 Interval y = all_grobs[i]->extent (me, a);
151 Grob *e = dynamic_cast<Grob *> (all_grobs[i]);
159 Read self-alignment-X and self-alignment-Y. This may seem like
160 code duplication. (and really: it is), but this is necessary to
161 prevent ugly cyclic dependencies that arise when you combine
162 self-alignment on a child with alignment of children.
164 static SCM prop_syms[2];
168 prop_syms[X_AXIS] = ly_symbol2scm ("self-alignment-X");
169 prop_syms[Y_AXIS] = ly_symbol2scm ("self-alignment-Y");
172 SCM align (me->internal_get_property (prop_syms[a]));
174 Array<Real> translates;
178 for (int j = 0; j < elems.size (); j++)
180 Real dy = -dims[j][-stacking_dir];
182 dy += dims[j - 1][stacking_dir];
190 dy = min (max (dy, threshold[SMALLER]),
194 where_f += stacking_dir * dy;
195 total.unite (dims[j] + where_f);
196 translates.push (where_f);
199 Real center_offset = 0.0;
201 also move the grobs that were empty, to maintain spatial order.
203 Array<Real> all_translates;
204 if (translates.size ())
208 Real w = translates[0];
209 while (j < all_grobs.size ())
211 if (i < elems.size () && all_grobs[j] == elems[i])
215 all_translates.push (w);
220 FIXME: uncommenting freaks out the Y-alignment of
223 if (scm_is_number (align))
224 center_offset = total.linear_combination (scm_to_double (align));
226 for (int j = 0; j < all_grobs.size (); j++)
227 all_grobs[j]->translate_axis (all_translates[j] - center_offset, a);
231 Align_interface::axis (Grob *me)
233 return Axis (scm_to_int (scm_car (me->get_property ("axes"))));
237 Align_interface::add_element (Grob *me, Grob *element, SCM call_back)
239 element->add_offset_callback (call_back, Align_interface::axis (me));
240 Axis_group_interface::add_element (me, element);
244 Align_interface::set_axis (Grob *me, Axis a)
246 Axis_group_interface::set_axes (me, a, a);
250 Find Y-axis parent of G that has a #'forced-distance property. This
251 has the effect of finding the piano-staff given an object in that
255 find_fixed_alignment_parent (Grob *g)
259 if (scm_is_number (g->get_property ("forced-distance")))
262 g = g->get_parent (Y_AXIS);
268 ADD_INTERFACE (Align_interface, "align-interface",
269 "Order grobs from top to bottom, left to right, right to left or bottom"
271 "forced-distance stacking-dir align-dir threshold positioning-done "
272 "center-element elements axes");
276 bool has_interface (Grob *);