2 axis-group-interface.cc -- implement Axis_group_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "axis-group-interface.hh"
11 #include "align-interface.hh"
12 #include "pointer-group-interface.hh"
14 #include "grob-array.hh"
15 #include "hara-kiri-group-spanner.hh"
16 #include "international.hh"
18 #include "paper-column.hh"
19 #include "paper-score.hh"
24 Axis_group_interface::add_element (Grob *me, Grob *e)
26 SCM axes = me->get_property ("axes");
27 if (!scm_is_pair (axes))
28 programming_error ("axes should be nonempty");
30 for (SCM ax = axes; ax != SCM_EOL; ax = scm_cdr (ax))
32 Axis a = (Axis) scm_to_int (scm_car (ax));
34 if (!e->get_parent (a))
35 e->set_parent (me, a);
37 e->internal_set_object ((a == X_AXIS)
38 ? ly_symbol2scm ("axis-group-parent-X")
39 : ly_symbol2scm ("axis-group-parent-Y"),
43 /* must be ordered, because Align_interface also uses
44 Axis_group_interface */
45 Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), e);
49 Axis_group_interface::has_axis (Grob *me, Axis a)
51 SCM axes = me->get_property ("axes");
53 return (SCM_BOOL_F != scm_memq (scm_from_int (a), axes));
57 Axis_group_interface::relative_group_extent (vector<Grob*> const &elts,
61 for (vsize i = 0; i < elts.size (); i++)
64 Interval dims = se->extent (common, a);
65 if (!dims.is_empty ())
72 Axis_group_interface::cached_pure_height (Grob *me,
73 vector<Grob*> const &elts,
77 Paper_score *ps = get_root_system (me)->paper_score ();
78 vector<vsize> breaks = ps->get_break_indices ();
79 vector<Grob*> cols = ps->get_columns ();
80 vsize start_index = VPOS;
81 vsize end_index = VPOS;
83 for (vsize i = 0; i < breaks.size (); i++)
85 int r = Paper_column::get_rank (cols[breaks[i]]);
92 if (start_index == VPOS || end_index == VPOS)
94 programming_error (_ ("tried to calculate pure-height at a non-breakpoint"));
95 return Interval (0, 0);
98 SCM extents = me->get_property ("cached-pure-extents");
99 if (!scm_is_vector (extents))
101 extents = scm_c_make_vector (breaks.size () - 1, SCM_EOL);
102 for (vsize i = 0; i < breaks.size () - 1; i++)
104 int st = Paper_column::get_rank (cols[breaks[i]]);
105 int ed = Paper_column::get_rank (cols[breaks[i+1]]);
106 Interval iv = relative_pure_height (me, elts, common, st, ed, false);
107 scm_vector_set_x (extents, scm_from_int (i), ly_interval2scm (iv));
109 me->set_property ("cached-pure-extents", extents);
113 for (vsize i = start_index; i < end_index; i++)
114 ext.unite (ly_scm2interval (scm_c_vector_ref (extents, i)));
119 Axis_group_interface::relative_pure_height (Grob *me,
120 vector<Grob*> const &elts,
125 /* It saves a _lot_ of time if we assume a VerticalAxisGroup is additive
126 (ie. height (i, k) = height (i, j) + height (j, k) for all i <= j <= k).
127 Unfortunately, it isn't always true, particularly if there is a
128 VerticalAlignment somewhere in the descendants.
130 Apart from PianoStaff, which has a fixed VerticalAlignment so it doesn't
131 count, the only VerticalAlignment comes from Score. This makes it
132 reasonably safe to assume that if our parent is a VerticalAlignment,
133 we can assume additivity and cache things nicely. */
134 Grob *p = me->get_parent (Y_AXIS);
135 if (use_cache && p && Align_interface::has_interface (p))
136 return Axis_group_interface::cached_pure_height (me, elts, common, start, end);
140 for (vsize i = 0; i < elts.size (); i++)
142 Interval_t<int> rank_span = elts[i]->spanned_rank_iv ();
143 Item *it = dynamic_cast<Item*> (elts[i]);
144 if (rank_span[LEFT] <= end && rank_span[RIGHT] >= start && (!it || it->pure_is_visible (start, end)))
146 Interval dims = elts[i]->pure_height (common, start, end);
147 if (!dims.is_empty ())
154 MAKE_SCHEME_CALLBACK (Axis_group_interface, width, 1);
156 Axis_group_interface::width (SCM smob)
158 Grob *me = unsmob_grob (smob);
159 return generic_group_extent (me, X_AXIS);
162 MAKE_SCHEME_CALLBACK (Axis_group_interface, height, 1);
164 Axis_group_interface::height (SCM smob)
166 Grob *me = unsmob_grob (smob);
167 return generic_group_extent (me, Y_AXIS);
170 MAKE_SCHEME_CALLBACK (Axis_group_interface, pure_height, 3);
172 Axis_group_interface::pure_height (SCM smob, SCM start_scm, SCM end_scm)
174 int start = robust_scm2int (start_scm, 0);
175 int end = robust_scm2int (end_scm, INT_MAX);
176 Grob *me = unsmob_grob (smob);
178 return pure_group_height (me, start, end);
182 Axis_group_interface::generic_group_extent (Grob *me, Axis a)
184 extract_grob_set (me, "elements", elts);
185 Grob *common = common_refpoint_of_array (elts, me, a);
187 Real my_coord = me->relative_coordinate (common, a);
188 Interval r (relative_group_extent (elts, common, a));
190 return ly_interval2scm (r - my_coord);
194 Axis_group_interface::pure_group_height (Grob *me, int start, int end)
196 Grob *common = unsmob_grob (me->get_object ("common-refpoint-of-elements"));
200 extract_grob_set (me, "elements", elts);
202 vector<Grob*> relevant_elts;
203 SCM is_relevant = ly_lily_module_constant ("pure-relevant");
205 for (vsize i = 0; i < elts.size (); i++)
207 if (to_boolean (scm_apply_1 (is_relevant, elts[i]->self_scm (), SCM_EOL)))
208 relevant_elts.push_back (elts[i]);
210 Item *it = dynamic_cast<Item*> (elts[i]);
215 Item *piece = it->find_prebroken_piece (d);
216 if (piece && to_boolean (scm_apply_1 (is_relevant, piece->self_scm (), SCM_EOL)))
217 relevant_elts.push_back (piece);
219 while (flip (&d) != LEFT);
222 common = common_refpoint_of_array (relevant_elts, me, Y_AXIS);
223 me->set_object ("common-refpoint-of-elements", common->self_scm ());
225 SCM ga_scm = Grob_array::make_array ();
226 Grob_array *ga = unsmob_grob_array (ga_scm);
227 ga->set_array (relevant_elts);
228 me->set_object ("pure-relevant-elements", ga_scm);
231 extract_grob_set (me, "pure-relevant-elements", elts);
232 Real my_coord = me->relative_coordinate (common, Y_AXIS);
233 Interval r (relative_pure_height (me, elts, common, start, end, true));
235 return ly_interval2scm (r - my_coord);
239 Axis_group_interface::get_children (Grob *me, vector<Grob*> *found)
241 found->push_back (me);
243 if (!has_interface (me))
246 extract_grob_set (me, "elements", elements);
247 for (vsize i = 0; i < elements.size (); i++)
249 Grob *e = elements[i];
250 Axis_group_interface::get_children (e, found);
254 ADD_INTERFACE (Axis_group_interface, "axis-group-interface",
256 "An object that groups other layout objects.",
261 "common-refpoint-of-elements "
262 "pure-relevant-elements "
263 "cached-pure-extents "