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> lines;
39 SCM prop = items[d]->get_property ("skylines");
41 Skyline (ly_scm2offsets (index_get_cell (prop, -d)),
45 while (flip (&d) != LEFT);
47 Real dist = padding + lines[LEFT].distance (lines[RIGHT]);
52 rod.item_drul_ = items;
60 Separation_item::set_distance (Drul_array<Item *> items,
64 if (0 && !Item::is_non_musical (items[LEFT])
65 && !Item::is_non_musical (items[RIGHT]))
67 set_skyline_distance (items, padding);
72 Interval li (Separation_item::width (items[LEFT]));
73 Interval ri (Separation_item::conditional_width (items[RIGHT], items[LEFT]));
74 if (!li.is_empty () && !ri.is_empty ())
78 rod.item_drul_ = items;
80 rod.distance_ = li[RIGHT] - ri[LEFT] + padding;
82 if (rod.distance_ > 0)
88 Return the width of ME given that we are considering the object on
92 Separation_item::conditional_width (Grob *me, Grob *left)
94 Interval w = width (me);
96 Item *item = dynamic_cast<Item *> (me);
97 Paper_column *pc = item->get_column ();
99 extract_grob_set (me, "conditional-elements", elts);
100 for (vsize i = 0; i < elts.size (); i++)
102 Item *il = dynamic_cast<Item *> (elts[i]);
103 if (pc != il->get_column ())
105 programming_error ("Separation_item element from wrong column");
109 if (to_boolean (il->get_property ("no-spacing-rods")))
112 if (Accidental_placement::has_interface (il))
113 w.unite (Accidental_placement::get_relevant_accidental_extent (il, pc, left));
116 SCM pad = me->get_property ("padding");
118 w.widen (robust_scm2double (pad, 0.0));
123 MAKE_SCHEME_CALLBACK(Separation_item,calc_skylines,1);
125 Separation_item::calc_skylines (SCM smob)
127 Item *me = unsmob_item (smob);
128 SCM lines = scm_cons (SCM_BOOL_F,SCM_BOOL_F);
131 vector<Box> bs = boxes (me);
134 Skyline l (bs, Y_AXIS, d);
135 index_set_cell (lines, d, ly_offsets2scm (l.to_points ()));
137 while (flip (&d) != LEFT);
144 Separation_item::boxes (Grob *me)
146 Item *item = dynamic_cast<Item *> (me);
148 int very_large = INT_MAX;
149 Paper_column *pc = item->get_column ();
151 extract_grob_set (me, "elements", elts);
153 Grob *ycommon = common_refpoint_of_array (elts, me, Y_AXIS);
155 for (vsize i = 0; i < elts.size (); i++)
157 Item *il = dynamic_cast<Item *> (elts[i]);
158 if (pc != il->get_column ())
163 if (to_boolean (il->get_property ("no-spacing-rods")))
166 Interval y (il->pure_height (ycommon, 0, very_large));
167 y.widen (0.01); // fixme
168 Box b (il->extent (pc, X_AXIS), y);
177 Separation_item::width (Grob *me)
179 SCM sw = me->get_property ("X-extent");
180 if (is_number_pair (sw))
181 return ly_scm2interval (sw);
183 Item *item = dynamic_cast<Item *> (me);
184 Paper_column *pc = item->get_column ();
187 extract_grob_set (me, "elements", elts);
188 for (vsize i = 0; i < elts.size (); i++)
190 Item *il = dynamic_cast<Item *> (elts[i]);
191 if (pc != il->get_column ())
193 /* this shouldn't happen, but let's continue anyway. */
194 programming_error ("Separation_item: I've been drinking too much");
195 continue; /*UGH UGH*/
198 if (to_boolean (il->get_property ("no-spacing-rods")))
201 Interval iv (il->extent (pc, X_AXIS));
206 SCM pad = me->get_property ("padding");
208 w.widen (robust_scm2double (pad, 0.0));
210 me->set_property ("X-extent", ly_interval2scm (w));
216 Separation_item::relative_width (Grob *me, Grob *common)
218 Interval iv = width (me);
220 return dynamic_cast<Item *> (me)->get_column ()->relative_coordinate (common, X_AXIS) + iv;
224 Try to find the break-aligned symbol in SEPARATION_ITEM that is
225 sticking out at direction D. The x size is put in LAST_EXT
228 Separation_item::extremal_break_aligned_grob (Grob *me,
232 Grob *col = dynamic_cast<Item *> (me)->get_column ();
233 last_ext->set_empty ();
236 extract_grob_set (me, "elements", elts);
237 for (vsize i = elts.size (); i--;)
239 Grob *break_item = elts[i];
240 if (!scm_is_symbol (break_item->get_property ("break-align-symbol")))
243 if (!scm_is_pair (break_item->get_property ("space-alist")))
246 Interval ext = break_item->extent (col, X_AXIS);
252 || (last_grob && d * (ext[d]- (*last_ext)[d]) > 0))
255 last_grob = break_item;
262 ADD_INTERFACE (Separation_item,
263 "Item that computes widths to generate spacing rods. "
264 "This is done in concert with @ref{separation-spanner-interface}.",
267 "conditional-elements "