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 "pointer-group-interface.hh"
15 #include "hara-kiri-group-spanner.hh"
17 MAKE_SCHEME_CALLBACK (Align_interface, alignment_callback, 2);
19 Align_interface::alignment_callback (SCM element_smob, SCM axis)
21 Grob *me = unsmob_grob (element_smob);
22 Axis ax = (Axis)scm_to_int (axis);
23 Grob *par = me->get_parent (ax);
24 if (par && !to_boolean (par->get_property ("positioning-done")))
26 Align_interface::align_elements_to_extents (par, ax);
28 return scm_make_real (0.0);
31 MAKE_SCHEME_CALLBACK (Align_interface, fixed_distance_alignment_callback, 2);
33 Align_interface::fixed_distance_alignment_callback (SCM element_smob, SCM axis)
35 Grob *me = unsmob_grob (element_smob);
36 Axis ax = (Axis)scm_to_int (axis);
37 Grob *par = me->get_parent (ax);
38 if (par && !to_boolean (par->get_property ("positioning-done")))
40 Align_interface::align_to_fixed_distance (par, ax);
42 return scm_make_real (0.0);
46 merge with align-to-extents?
49 Align_interface::align_to_fixed_distance (Grob *me, Axis a)
51 me->set_property ("positioning-done", SCM_BOOL_T);
53 SCM d = me->get_property ("stacking-dir");
55 Direction stacking_dir = scm_is_number (d) ? to_dir (d) : CENTER;
59 Real dy = robust_scm2double (me->get_property ("forced-distance"), 0.0);
61 extract_grob_set (me, "elements", elem_source);
63 Link_array<Grob> elems (elem_source); // writable..
69 Array<Real> translates;
71 for (int j = elems.size (); j--;)
74 This is not very elegant, in that we need special support for
75 hara-kiri. Unfortunately, the generic wiring of
76 force_hara_kiri_callback () (extent and offset callback) is
77 such that we might get into a loop if we call extent () or
78 offset () the elements.
83 && Hara_kiri_group_spanner::has_interface (elems[j]))
84 Hara_kiri_group_spanner::consider_suicide (elems[j]);
86 if (!elems[j]->is_live ())
90 for (int j = 0; j < elems.size (); j++)
92 where_f += stacking_dir * dy;
93 translates.push (where_f);
94 v.unite (Interval (where_f, where_f));
98 TODO: support self-alignment-{Y, X}
100 for (int i = 0; i < translates.size (); i++)
102 elems[i]->translate_axis (translates[i] - v.center (), a);
107 Hairy function to put elements where they should be. Can be tweaked
108 from the outside by setting extra-space in its
111 We assume that the children the refpoints of the children are still
112 found at 0.0 -- we will fuck up with thresholds if children's
113 extents are already moved to locations such as (-16, -8), since the
114 dy needed to put things in a row doesn't relate to the distances
115 between original refpoints.
117 TODO: maybe we should rethink and throw out thresholding altogether.
118 The original function has been taken over by
119 align_to_fixed_distance ().
122 Align_interface::align_elements_to_extents (Grob *me, Axis a)
124 Spanner *me_spanner = dynamic_cast<Spanner *> (me);
127 && me_spanner->get_bound (LEFT)->break_status_dir () == CENTER)
129 me_spanner->warning (_("vertical alignment called before line-breaking. Only do cross-staff spanners with PianoStaff."));
132 me->set_property ("positioning-done", SCM_BOOL_T);
134 SCM d = me->get_property ("stacking-dir");
136 Direction stacking_dir = scm_is_number (d) ? to_dir (d) : CENTER;
140 Interval threshold = robust_scm2interval (me->get_property ("threshold"),
141 Interval (0, Interval::infinity ()));
143 Array<Interval> dims;
145 Link_array<Grob> elems;
147 extract_grob_set (me, "elements", all_grobs);
148 for (int i = 0; i < all_grobs.size (); i++)
150 Interval y = all_grobs[i]->extent (me, a);
153 Grob *e = dynamic_cast<Grob *> (all_grobs[i]);
161 Read self-alignment-X and self-alignment-Y. This may seem like
162 code duplication. (and really: it is), but this is necessary to
163 prevent ugly cyclic dependencies that arise when you combine
164 self-alignment on a child with alignment of children.
166 static SCM prop_syms[2];
170 prop_syms[X_AXIS] = ly_symbol2scm ("self-alignment-X");
171 prop_syms[Y_AXIS] = ly_symbol2scm ("self-alignment-Y");
174 SCM align (me->internal_get_property (prop_syms[a]));
176 Array<Real> translates;
180 for (int j = 0; j < elems.size (); j++)
182 Real dy = -dims[j][-stacking_dir];
184 dy += dims[j - 1][stacking_dir];
192 dy = min (max (dy, threshold[SMALLER]),
196 where_f += stacking_dir * dy;
197 total.unite (dims[j] + where_f);
198 translates.push (where_f);
201 Real center_offset = 0.0;
203 also move the grobs that were empty, to maintain spatial order.
205 Array<Real> all_translates;
206 if (translates.size ())
210 Real w = translates[0];
211 while (j < all_grobs.size ())
213 if (i < elems.size () && all_grobs[j] == elems[i])
217 all_translates.push (w);
222 FIXME: uncommenting freaks out the Y-alignment of
225 if (scm_is_number (align))
226 center_offset = total.linear_combination (scm_to_double (align));
228 for (int j = 0; j < all_grobs.size (); j++)
229 all_grobs[j]->translate_axis (all_translates[j] - center_offset, a);
233 Align_interface::axis (Grob *me)
235 return Axis (scm_to_int (scm_car (me->get_property ("axes"))));
239 Align_interface::add_element (Grob *me, Grob *element, SCM call_back)
241 element->add_offset_callback (call_back, Align_interface::axis (me));
242 Axis_group_interface::add_element (me, element);
246 Align_interface::set_axis (Grob *me, Axis a)
248 Axis_group_interface::set_axes (me, a, a);
252 Find Y-axis parent of G that has a #'forced-distance property. This
253 has the effect of finding the piano-staff given an object in that
257 find_fixed_alignment_parent (Grob *g)
261 if (scm_is_number (g->get_property ("forced-distance")))
264 g = g->get_parent (Y_AXIS);
270 ADD_INTERFACE (Align_interface, "align-interface",
271 "Order grobs from top to bottom, left to right, right to left or bottom"
273 "forced-distance stacking-dir align-dir threshold positioning-done "
278 bool has_interface (Grob *);