2 grob.cc -- implement Grob
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
14 #include "input-smob.hh"
16 #include "pointer-group-interface.hh"
18 #include "paper-score.hh"
27 #include "paper-score.hh"
28 #include "ly-smobs.icc"
29 #include "output-def.hh"
34 MAKE_SCHEME_CALLBACK(Grob, y_parent_positioning, 1);
36 Grob::y_parent_positioning (SCM smob)
38 Grob *me = unsmob_grob (smob);
39 Grob *par = me->get_parent (Y_AXIS);
41 (void) par->get_property ("positioning-done");
43 return scm_from_double (0.0);
47 MAKE_SCHEME_CALLBACK(Grob, x_parent_positioning, 1);
49 Grob::x_parent_positioning (SCM smob)
51 Grob *me = unsmob_grob (smob);
53 Grob *par = me->get_parent (X_AXIS);
55 (void) par->get_property ("positioning-done");
57 return scm_from_double (0.0);
61 Grob::clone (int count) const
63 return new Grob (*this, count);
68 - remove dynamic_cast<Spanner, Item> and put this code into respective
72 #define INFINITY_MSG "Infinity or NaN encountered"
74 Grob::Grob (SCM basicprops,
75 Object_key const *key)
78 /* FIXME: default should be no callback. */
82 interfaces_ = SCM_EOL;
83 immutable_property_alist_ = basicprops;
84 mutable_property_alist_ = SCM_EOL;
85 object_alist_ = SCM_EOL;
87 /* We do smobify_self () as the first step. Since the object lives
88 on the heap, none of its SCM variables are protected from
89 GC. After smobify_self (), they are. */
93 We always get a new key object for a new grob.
96 ((Object_key *)key_)->unprotect ();
98 SCM meta = get_property ("meta");
99 if (scm_is_pair (meta))
100 interfaces_ = scm_cdr (scm_assq (ly_symbol2scm ("interfaces"), meta));
102 if (get_property_data (ly_symbol2scm ("X-extent")) == SCM_EOL)
103 set_property ("X-extent", Grob::stencil_width_proc);
104 if (get_property_data (ly_symbol2scm ("Y-extent")) == SCM_EOL)
105 set_property ("Y-extent", Grob::stencil_height_proc);
108 Grob::Grob (Grob const &s, int copy_index)
109 : dim_cache_ (s.dim_cache_)
111 key_ = (use_object_keys) ? new Copied_key (s.key_, copy_index) : 0;
112 original_ = (Grob *) & s;
115 immutable_property_alist_ = s.immutable_property_alist_;
116 mutable_property_alist_ = ly_deep_copy (s.mutable_property_alist_);
117 interfaces_ = s.interfaces_;
118 object_alist_ = SCM_EOL;
124 ((Object_key *)key_)->unprotect ();
132 MAKE_SCHEME_CALLBACK (Grob, stencil_height, 1);
134 Grob::stencil_height (SCM smob)
136 Grob *me = unsmob_grob (smob);
137 return stencil_extent (me, Y_AXIS);
140 MAKE_SCHEME_CALLBACK (Grob, stencil_width, 1);
142 Grob::stencil_width (SCM smob)
144 Grob *me = unsmob_grob (smob);
145 return stencil_extent (me, X_AXIS);
149 Grob::stencil_extent (Grob *me, Axis a)
151 Stencil *m = me->get_stencil ();
155 return ly_interval2scm (e);
159 robust_relative_extent (Grob *me, Grob *refpoint, Axis a)
161 Interval ext = me->extent (refpoint, a);
163 ext.add_point (me->relative_coordinate (refpoint, a));
169 Grob::get_layout () const
171 return pscore_ ? pscore_->layout () : 0;
175 Grob::get_stencil () const
180 SCM stil = get_property ("stencil");
181 return unsmob_stencil (stil);
185 Grob::get_print_stencil () const
187 SCM stil = get_property ("stencil");
190 if (Stencil *m = unsmob_stencil (stil))
193 if (to_boolean (get_property ("transparent")))
194 retval = Stencil (m->extent_box (), SCM_EOL);
197 SCM expr = m->expr ();
198 if (point_and_click_global)
199 expr = scm_list_3 (ly_symbol2scm ("grob-cause"),
202 retval = Stencil (m->extent_box (), expr);
205 /* color support... see interpret_stencil_expression () for more... */
206 SCM color = get_property ("color");
207 if (color != SCM_EOL)
209 m = unsmob_stencil (stil);
210 SCM expr = scm_list_3 (ly_symbol2scm ("color"),
214 retval = Stencil (m->extent_box (), expr);
226 Grob::do_break_processing ()
231 Grob::get_system () const
238 Grob::handle_broken_dependencies ()
240 Spanner *sp = dynamic_cast<Spanner *> (this);
245 /* THIS, SP is the original spanner. We use a special function
246 because some Spanners have enormously long lists in their
247 properties, and a special function fixes FOO */
249 for (SCM s = object_alist_; scm_is_pair (s); s = scm_cdr (s))
250 sp->substitute_one_mutable_property (scm_caar (s), scm_cdar (s));
252 System *system = get_system ();
256 && common_refpoint (system, X_AXIS)
257 && common_refpoint (system, Y_AXIS))
258 substitute_object_links (system->self_scm (), object_alist_);
259 else if (dynamic_cast<System *> (this))
260 substitute_object_links (SCM_UNDEFINED, object_alist_);
262 /* THIS element is `invalid'; it has been removed from all
263 dependencies, so let's junk the element itself.
265 Do not do this for System, since that would remove references
266 to the originals of score-grobs, which get then GC'd (a bad
271 /* Note that we still want references to this element to be
272 rearranged, and not silently thrown away, so we keep pointers like
273 {broken_into_{drul, array}, original}
281 mutable_property_alist_ = SCM_EOL;
282 object_alist_ = SCM_EOL;
283 immutable_property_alist_ = SCM_EOL;
284 interfaces_ = SCM_EOL;
288 Grob::handle_prebroken_dependencies ()
290 /* Don't do this in the derived method, since we want to keep access to
291 object_alist_ centralized. */
294 Item *it = dynamic_cast<Item *> (this);
295 substitute_object_links (scm_from_int (it->break_status_dir ()),
296 original_->object_alist_);
301 Grob::find_broken_piece (System *) const
306 /* Translate in one direction. */
308 Grob::translate_axis (Real y, Axis a)
310 if (isinf (y) || isnan (y))
312 programming_error (_ (INFINITY_MSG));
316 if (!dim_cache_[a].offset_)
317 dim_cache_[a].offset_ = new Real (y);
319 *dim_cache_[a].offset_ += y;
322 /* Find the offset relative to D. If D equals THIS, then it is 0.
323 Otherwise, it recursively defd as
325 OFFSET_ + PARENT_L_->relative_coordinate (D) */
327 Grob::relative_coordinate (Grob const *refp, Axis a) const
332 /* We catch PARENT_L_ == nil case with this, but we crash if we did
333 not ask for the absolute coordinate (ie. REFP == nil.) */
334 Real off = get_offset (a);
335 if (refp == dim_cache_[a].parent_)
338 off += dim_cache_[a].parent_->relative_coordinate (refp, a);
343 /* Invoke callbacks to get offset relative to parent. */
345 Grob::get_offset (Axis a) const
347 if (dim_cache_[a].offset_)
348 return *dim_cache_[a].offset_;
350 Grob *me = (Grob *) this;
352 SCM sym = axis_offset_symbol (a);
353 me->dim_cache_[a].offset_ = new Real (0.0);
356 UGH: can't fold next 2 statements together. Apparently GCC thinks
357 dim_cache_[a].offset_ is unaliased.
359 Real off = robust_scm2double (internal_get_property (sym), 0.0);
360 *me->dim_cache_[a].offset_ += off;
362 me->del_property (sym);
363 return *me->dim_cache_[a].offset_;
367 Grob::flush_extent_cache (Axis axis)
369 if (dim_cache_[axis].extent_)
372 Ugh, this is not accurate; will flush property, causing
373 callback to be called if.
375 del_property ((axis == X_AXIS) ? ly_symbol2scm ("X-extent") : ly_symbol2scm ("Y-extent"));
376 delete dim_cache_[axis].extent_;
377 dim_cache_[axis].extent_ = 0;
378 if (get_parent (axis))
379 get_parent (axis)->flush_extent_cache (axis);
385 Grob::extent (Grob *refp, Axis a) const
387 Real offset = relative_coordinate (refp, a);
389 if (dim_cache_[a].extent_)
391 real_ext = *dim_cache_[a].extent_;
397 ? ly_symbol2scm ("minimum-X-extent")
398 : ly_symbol2scm ("minimum-Y-extent");
402 ? ly_symbol2scm ("X-extent")
403 : ly_symbol2scm ("Y-extent");
405 SCM min_ext = internal_get_property (min_ext_sym);
406 SCM ext = internal_get_property (ext_sym);
408 if (is_number_pair (min_ext))
409 real_ext.unite (ly_scm2interval (min_ext));
410 if (is_number_pair (ext))
411 real_ext.unite (ly_scm2interval (ext));
413 ((Grob*)this)->del_property (ext_sym);
414 ((Grob*)this)->dim_cache_[a].extent_ = new Interval (real_ext);
417 real_ext.translate (offset);
422 /* Find the group-element which has both #this# and #s# */
424 Grob::common_refpoint (Grob const *s, Axis a) const
426 /* I don't like the quadratic aspect of this code, but I see no
427 other way. The largest chain of parents might be 10 high or so,
428 so it shouldn't be a real issue. */
429 for (Grob const *c = this; c; c = c->dim_cache_[a].parent_)
430 for (Grob const *d = s; d; d = d->dim_cache_[a].parent_)
438 common_refpoint_of_list (SCM elist, Grob *common, Axis a)
440 for (; scm_is_pair (elist); elist = scm_cdr (elist))
441 if (Grob *s = unsmob_grob (scm_car (elist)))
444 common = common->common_refpoint (s, a);
453 common_refpoint_of_array (Link_array<Grob> const &arr, Grob *common, Axis a)
455 for (int i = arr.size (); i--;)
456 if (Grob *s = arr[i])
459 common = common->common_refpoint (s, a);
470 SCM meta = get_property ("meta");
471 SCM nm = scm_assq (ly_symbol2scm ("name"), meta);
472 nm = (scm_is_pair (nm)) ? scm_cdr (nm) : SCM_EOL;
473 return scm_is_symbol (nm) ? ly_symbol2string (nm) : this->class_name ();
477 Grob::set_parent (Grob *g, Axis a)
479 dim_cache_[a].parent_ = g;
483 Grob::fixup_refpoint ()
485 for (int a = X_AXIS; a < NO_AXES; a++)
488 Grob *parent = get_parent (ax);
493 if (parent->get_system () != get_system () && get_system ())
495 Grob *newparent = parent->find_broken_piece (get_system ());
496 set_parent (newparent, ax);
499 if (Item *i = dynamic_cast<Item *> (this))
501 Item *parenti = dynamic_cast<Item *> (parent);
505 Direction my_dir = i->break_status_dir ();
506 if (my_dir != parenti->break_status_dir ())
508 Item *newparent = parenti->find_prebroken_piece (my_dir);
509 set_parent (newparent, ax);
517 Grob::warning (String s) const
519 SCM cause = self_scm ();
520 while (Grob *g = unsmob_grob (cause))
521 cause = g->get_property ("cause");
523 if (Music *m = unsmob_music (cause))
524 m->origin ()->warning (s);
530 Grob::programming_error (String s) const
532 SCM cause = self_scm ();
533 while (Grob *g = unsmob_grob (cause))
534 cause = g->get_property ("cause");
536 s = _f ("programming error: %s", s);
538 if (Music *m = unsmob_music (cause))
539 m->origin ()->message (s);
544 Grob::discretionary_processing ()
549 Grob::internal_has_interface (SCM k)
551 return scm_c_memq (k, interfaces_) != SCM_BOOL_F;
555 Grob::get_parent (Axis a) const
557 return dim_cache_[a].parent_;
560 /** Return Array of Grobs in SCM list LST */
562 ly_scm2grobs (SCM lst)
564 Link_array<Grob> arr;
566 for (SCM s = lst; scm_is_pair (s); s = scm_cdr (s))
569 arr.push (unsmob_grob (e));
577 Grob::get_key () const
582 /** Return SCM list of Grob array A */
584 ly_grobs2scm (Link_array<Grob> a)
587 for (int i = a.size (); i; i--)
588 s = scm_cons (a[i - 1]->self_scm (), s);
593 ADD_INTERFACE (Grob, "grob-interface",
594 "A grob represents a piece of music notation\n"
596 "All grobs have an X and Y-position on the page. These X and Y positions\n"
597 "are stored in a relative format, so they can easily be combined by\n"
598 "stacking them, hanging one grob to the side of another, and coupling\n"
599 "them into a grouping objects.\n"
601 "Each grob has a reference point (a.k.a. parent): the position of a grob\n"
602 "is stored relative to that reference point. For example the X-reference\n"
603 "point of a staccato dot usually is the note head that it applies\n"
604 "to. When the note head is moved, the staccato dot moves along\n"
607 "A grob is often associated with a symbol, but some grobs do not print\n"
608 "any symbols. They take care of grouping objects. For example, there is a\n"
609 "separate grob that stacks staves vertically. The @ref{NoteCollision}\n"
610 "is also an abstract grob: it only moves around chords, but doesn't print\n"
613 "Grobs have a properties: Scheme variables, that can be read and set. "
614 "They have two types. Immutable variables "
615 "define the default style and behavior. They are shared between many objects. "
616 "They can be changed using @code{\\override} and @code{\\revert}. "
618 "Mutable properties are variables that are specific to one grob. Typically, "
619 "lists of other objects, or results from computations are stored in"
620 "mutable properties: every call to set-grob-property (or its C++ equivalent) "
621 "sets a mutable property. "
623 "The properties @code{after-line-breaking} and @code{before-line-breaking} "
624 "are dummies that are not user-serviceable. "
633 "after-line-breaking "
634 "axis-group-parent-X "
635 "axis-group-parent-Y "
636 "before-line-breaking "