2 spanner.cc -- implement Spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include "pointer-group-interface.hh"
13 #include "libc-extension.hh"
14 #include "paper-column.hh"
15 #include "paper-column.hh"
16 #include "paper-score.hh"
22 Spanner::clone (int count) const
24 return new Spanner (*this, count);
28 Spanner::do_break_processing ()
31 Item *left = spanned_drul_[LEFT];
32 Item *right = spanned_drul_[RIGHT];
38 Check if our parent in X-direction spans equally wide
41 for (int a = X_AXIS; a < NO_AXES; a++)
43 if (Spanner *parent = dynamic_cast<Spanner *> (get_parent ((Axis)a)))
45 if (!parent->spanned_rank_iv ().superset (this->spanned_rank_iv ()))
47 programming_error (to_string ("Spanner `%s' is not fully contained in parent spanner `%s'.",
49 parent->name ().c_str ()));
54 if (get_system () || is_broken ())
60 If we have a spanner spanning one column, we must break it
61 anyway because it might provide a parent for another item. */
65 Item *bound = left->find_prebroken_piece (d);
67 programming_error ("no broken bound");
68 else if (bound->get_system ())
70 Spanner *span = dynamic_cast<Spanner *> (clone (broken_intos_.size ()));
71 span->set_bound (LEFT, bound);
72 span->set_bound (RIGHT, bound);
74 assert (span->get_system ());
75 span->get_system ()->typeset_grob (span);
76 broken_intos_.push_back (span);
79 while ((flip (&d)) != LEFT);
83 System *root = get_root_system (this);
84 vector<Item*> break_points = root->broken_col_range (left, right);
86 break_points.insert (break_points.begin () + 0, left);
87 break_points.push_back (right);
89 for (vsize i = 1; i < break_points.size (); i++)
91 Drul_array<Item *> bounds;
92 bounds[LEFT] = break_points[i - 1];
93 bounds[RIGHT] = break_points[i];
97 if (!bounds[d]->get_system ())
98 bounds[d] = bounds[d]->find_prebroken_piece (- d);
100 while ((flip (&d)) != LEFT);
102 if (!bounds[LEFT] || ! bounds[RIGHT])
104 programming_error ("bounds of this piece aren't breakable. ");
108 Spanner *span = dynamic_cast<Spanner *> (clone (broken_intos_.size ()));
109 span->set_bound (LEFT, bounds[LEFT]);
110 span->set_bound (RIGHT, bounds[RIGHT]);
112 if (!bounds[LEFT]->get_system ()
114 || !bounds[RIGHT]->get_system ()
115 || bounds[LEFT]->get_system () != bounds[RIGHT]->get_system ())
117 programming_error ("bounds of spanner are invalid");
122 bounds[LEFT]->get_system ()->typeset_grob (span);
123 broken_intos_.push_back (span);
127 vector_sort (broken_intos_, Spanner::compare);
128 for (vsize i = broken_intos_.size (); i--;)
129 broken_intos_[i]->break_index_ = i;
133 Spanner::get_break_index () const
139 Spanner::set_my_columns ()
141 Direction i = (Direction) LEFT;
144 if (!spanned_drul_[i]->get_system ())
145 set_bound (i, spanned_drul_[i]->find_prebroken_piece ((Direction) -i));
147 while (flip (&i) != LEFT);
151 Spanner::spanned_rank_iv ()
153 Interval_t<int> iv (0, 0);
155 if (spanned_drul_[LEFT] && spanned_drul_[LEFT]->get_column ())
156 iv[LEFT] = spanned_drul_[LEFT]->get_column ()->get_rank ();
157 if (spanned_drul_[RIGHT] && spanned_drul_[RIGHT]->get_column ())
158 iv[RIGHT] = spanned_drul_[RIGHT]->get_column ()->get_rank ();
163 Spanner::get_bound (Direction d) const
165 return spanned_drul_ [d];
169 Set the items that this spanner spans. If D == LEFT, we also set the
170 X-axis parent of THIS to S.
173 Spanner::set_bound (Direction d, Grob *s)
175 Item *i = dynamic_cast<Item *> (s);
178 programming_error ("must have Item for spanner bound");
182 spanned_drul_[d] = i;
185 We check for System to prevent the column -> line_of_score
186 -> column -> line_of_score -> etc situation */
187 if (d == LEFT && !dynamic_cast<System *> (this))
188 set_parent (i, X_AXIS);
191 Signal that this column needs to be kept alive. They need to be
192 kept alive to have meaningful position and linebreaking.
194 [maybe we should try keeping all columns alive?, and perhaps
195 inherit position from their (non-)musical brother]
198 if (dynamic_cast<Paper_column *> (i))
199 Pointer_group_interface::add_grob (i, ly_symbol2scm ("bounded-by-me"), this);
202 Spanner::Spanner (SCM s, Object_key const *key)
206 spanned_drul_[LEFT] = 0;
207 spanned_drul_[RIGHT] = 0;
210 Spanner::Spanner (Spanner const &s, int count)
213 spanned_drul_[LEFT] = spanned_drul_[RIGHT] = 0;
217 Spanner::spanner_length () const
219 Real l = spanned_drul_[LEFT]->relative_coordinate (0, X_AXIS);
220 Real r = spanned_drul_[RIGHT]->relative_coordinate (0, X_AXIS);
223 programming_error ("spanner with negative length");
229 Spanner::get_system () const
231 if (!spanned_drul_[LEFT] || !spanned_drul_[RIGHT])
233 if (spanned_drul_[LEFT]->get_system () != spanned_drul_[RIGHT]->get_system ())
235 return spanned_drul_[LEFT]->get_system ();
239 Spanner::find_broken_piece (System *l) const
241 vsize idx = binary_search (broken_intos_, (Spanner *)l, Spanner::compare);
243 return broken_intos_ [idx];
248 Spanner::compare (Spanner *const &p1, Spanner *const &p2)
250 return p1->get_system ()->get_rank () - p2->get_system ()->get_rank ();
254 Spanner::is_broken () const
256 return broken_intos_.size ();
260 If this is a broken spanner, return the amount the left end is to be
261 shifted horizontally so that the spanner starts after the initial
262 clef and key on the staves. This is necessary for ties, slurs,
263 crescendo and decrescendo signs, for example.
266 Spanner::get_broken_left_end_align () const
268 Paper_column *sc = dynamic_cast<Paper_column *> (spanned_drul_[LEFT]->get_column ());
270 // Relevant only if left span point is first column in line
272 && sc->break_status_dir () == RIGHT)
275 We used to do a full search for the Break_align_item.
276 But that doesn't make a difference, since the Paper_column
277 is likely to contain only a Break_align_item.
279 return sc->extent (sc, X_AXIS)[RIGHT];
286 Spanner::derived_mark () const
290 if (spanned_drul_[d])
291 scm_gc_mark (spanned_drul_[d]->self_scm ());
292 while (flip (&d) != LEFT)
295 for (vsize i = broken_intos_.size (); i--;)
296 scm_gc_mark (broken_intos_[i]->self_scm ());
300 Set left or right bound to IT.
302 Warning: caller should ensure that subsequent calls put in ITems
303 that are left-to-right ordered.
306 add_bound_item (Spanner *sp, Grob *it)
308 if (!sp->get_bound (LEFT))
309 sp->set_bound (LEFT, it);
311 sp->set_bound (RIGHT, it);
314 MAKE_SCHEME_CALLBACK (Spanner, set_spacing_rods, 1);
316 Spanner::set_spacing_rods (SCM smob)
318 Grob *me = unsmob_grob (smob);
321 Spanner *sp = dynamic_cast<Spanner *> (me);
322 r.item_drul_[LEFT] = sp->get_bound (LEFT);
323 r.item_drul_[RIGHT] = sp->get_bound (RIGHT);
325 = robust_scm2double (me->get_property ("minimum-length"), 0);
328 return SCM_UNSPECIFIED;
332 Return I such that SP == SP->ORIGINAL ()->BROKEN_INTOS_[I].
335 broken_spanner_index (Spanner *sp)
337 Spanner *parent = dynamic_cast<Spanner *> (sp->original ());
338 return find (parent->broken_intos_, sp) - parent->broken_intos_.begin ();
342 unsmob_spanner (SCM s)
344 return dynamic_cast<Spanner *> (unsmob_grob (s));
347 ADD_INTERFACE (Spanner,
349 "Some objects are horizontally spanned between objects. For\n"
350 "example, slur, beam, tie, etc. These grobs form a subtype called\n"
351 "@code{Spanner}. All spanners have two span-points (these must be\n"
352 "@code{Item} objects), one on the left and one on the right. The left bound is\n"
353 "also the X-reference point of the spanner.\n",