2 separation-item.cc -- implement Separation_item
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "separation-item.hh"
12 #include "paper-column.hh"
14 #include "pointer-group-interface.hh"
15 #include "accidental-placement.hh"
18 Separation_item::add_item (Grob *s, Item *i)
21 Pointer_group_interface::add_grob (s, ly_symbol2scm ("elements"), i);
25 Separation_item::add_conditional_item (Grob *me, Grob *e)
27 Pointer_group_interface::add_grob (me, ly_symbol2scm ("conditional-elements"), e);
31 Separation_item::set_skyline_distance (Drul_array<Item *> items,
34 Drul_array<Skyline_pair*> lines (Skyline_pair::unsmob (items[LEFT]->get_property ("skylines")),
35 Skyline_pair::unsmob (items[RIGHT]->get_property ("skylines")));
37 Real dist = padding + (*lines[LEFT])[RIGHT].distance ((*lines[RIGHT])[LEFT]);
42 rod.item_drul_ = items;
50 Separation_item::set_distance (Drul_array<Item *> items,
53 if (!Item::is_non_musical (items[LEFT])
54 && !Item::is_non_musical (items[RIGHT]))
56 set_skyline_distance (items, padding);
60 Interval li (Separation_item::width (items[LEFT]));
61 Interval ri (Separation_item::conditional_width (items[RIGHT], items[LEFT]));
62 if (!li.is_empty () && !ri.is_empty ())
66 rod.item_drul_ = items;
68 rod.distance_ = li[RIGHT] - ri[LEFT] + padding;
70 if (rod.distance_ > 0)
78 Return the width of ME given that we are considering the object on
82 Separation_item::conditional_width (Grob *me, Grob *left)
84 Interval w = width (me);
86 Item *item = dynamic_cast<Item *> (me);
87 Paper_column *pc = item->get_column ();
89 extract_grob_set (me, "conditional-elements", elts);
90 for (vsize i = 0; i < elts.size (); i++)
92 Item *il = dynamic_cast<Item *> (elts[i]);
93 if (pc != il->get_column ())
95 programming_error ("Separation_item element from wrong column");
99 if (to_boolean (il->get_property ("no-spacing-rods")))
102 if (Accidental_placement::has_interface (il))
103 w.unite (Accidental_placement::get_relevant_accidental_extent (il, pc, left));
106 SCM pad = me->get_property ("padding");
108 w.widen (robust_scm2double (pad, 0.0));
113 MAKE_SCHEME_CALLBACK(Separation_item,calc_skylines,1);
115 Separation_item::calc_skylines (SCM smob)
117 Item *me = unsmob_item (smob);
118 vector<Box> bs = boxes (me);
119 /* todo: the horizon_padding is somewhat arbitrary */
120 return Skyline_pair (bs, 0.1, Y_AXIS).smobbed_copy ();
125 Separation_item::boxes (Grob *me)
127 Item *item = dynamic_cast<Item *> (me);
129 int very_large = INT_MAX;
130 Paper_column *pc = item->get_column ();
132 extract_grob_set (me, "elements", elts);
134 Grob *ycommon = common_refpoint_of_array (elts, me, Y_AXIS);
136 for (vsize i = 0; i < elts.size (); i++)
138 Item *il = dynamic_cast<Item *> (elts[i]);
139 if (pc != il->get_column ())
144 if (to_boolean (il->get_property ("no-spacing-rods")))
147 Interval y (il->pure_height (ycommon, 0, very_large));
148 Box b (il->extent (pc, X_AXIS), y);
157 Separation_item::width (Grob *me)
159 SCM sw = me->get_property ("X-extent");
160 if (is_number_pair (sw))
161 return ly_scm2interval (sw);
163 Item *item = dynamic_cast<Item *> (me);
164 Paper_column *pc = item->get_column ();
167 extract_grob_set (me, "elements", elts);
168 for (vsize i = 0; i < elts.size (); i++)
170 Item *il = dynamic_cast<Item *> (elts[i]);
171 if (pc != il->get_column ())
173 /* this shouldn't happen, but let's continue anyway. */
174 programming_error ("Separation_item: I've been drinking too much");
175 continue; /*UGH UGH*/
178 if (to_boolean (il->get_property ("no-spacing-rods")))
181 Interval iv (il->extent (pc, X_AXIS));
186 SCM pad = me->get_property ("padding");
188 w.widen (robust_scm2double (pad, 0.0));
190 me->set_property ("X-extent", ly_interval2scm (w));
196 Separation_item::relative_width (Grob *me, Grob *common)
198 Interval iv = width (me);
200 return dynamic_cast<Item *> (me)->get_column ()->relative_coordinate (common, X_AXIS) + iv;
204 Try to find the break-aligned symbol in SEPARATION_ITEM that is
205 sticking out at direction D. The x size is put in LAST_EXT
208 Separation_item::extremal_break_aligned_grob (Grob *me,
212 Grob *col = dynamic_cast<Item *> (me)->get_column ();
213 last_ext->set_empty ();
216 extract_grob_set (me, "elements", elts);
217 for (vsize i = elts.size (); i--;)
219 Grob *break_item = elts[i];
220 if (!scm_is_symbol (break_item->get_property ("break-align-symbol")))
223 if (!scm_is_pair (break_item->get_property ("space-alist")))
226 Interval ext = break_item->extent (col, X_AXIS);
232 || (last_grob && d * (ext[d]- (*last_ext)[d]) > 0))
235 last_grob = break_item;
242 ADD_INTERFACE (Separation_item,
243 "Item that computes widths to generate spacing rods. "
244 "This is done in concert with @ref{separating-group-spanner-interface}.",
247 "conditional-elements "