-/*
- separating-group-spanner.cc -- implement Separating_group_spanner
-
+/*
+ separating-group-spanner.cc -- implement Separating_group_spanner
+
source file of the GNU LilyPond music typesetter
-
- (c) 1998--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-
- */
+
+ (c) 1998--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
#include "separating-group-spanner.hh"
-#include "single-malt-grouping-item.hh"
+
+#include "separation-item.hh"
#include "paper-column.hh"
-#include "paper-def.hh"
+#include "output-def.hh"
#include "dimensions.hh"
#include "group-interface.hh"
-static Rod
-make_rod (Single_malt_grouping_item *l, Single_malt_grouping_item *r)
+void
+Separating_group_spanner::find_rods (Item *r, SCM next, Real padding)
{
- Rod rod;
- Interval li (l->my_width ());
- Interval ri (r->my_width ());
+ /*
+ This is an inner loop: look for the first normal (unbroken) Left
+ grob. This looks like an inner loop (ie. quadratic total), but in
+ most cases, the interesting L will just be the first entry of
+ NEXT, making it linear in most of the cases.
+ */
+ if (Separation_item::width (r).is_empty ())
+ return;
+
+ for (; scm_is_pair (next); next = scm_cdr (next))
+ {
+ Item *l = dynamic_cast<Item *> (unsmob_grob (scm_car (next)));
+ Item *lb = l->find_prebroken_piece (RIGHT);
+
+ if (lb)
+ {
+ Interval li (Separation_item::width (lb));
+ Interval ri (Separation_item::conditional_width (r, lb));
+ if (!li.is_empty () && !ri.is_empty ())
+ {
+ Rod rod;
+
+ rod.item_drul_[LEFT] = lb;
+ rod.item_drul_[RIGHT] = r;
+
+ rod.distance_ = li[RIGHT] - ri[LEFT] + padding;
+ rod.add_to_cols ();
+ }
+ }
+
+ Interval li (Separation_item::width (l));
+ Interval ri (Separation_item::conditional_width (r, l));
+ if (!li.is_empty () && !ri.is_empty ())
+ {
+ Rod rod;
+
+ rod.item_drul_[LEFT] = l;
+ rod.item_drul_[RIGHT] = r;
- rod.item_l_drul_[LEFT] =l;
- rod.item_l_drul_[RIGHT]=r;
+ rod.distance_ = li[RIGHT] - ri[LEFT] + padding;
- if (li.empty_b () || ri.empty_b ())
- rod.distance_f_ = 0;
- else
- rod.distance_f_ = li[RIGHT] - ri[LEFT];
+ if (rod.distance_ > 0.0)
+ rod.add_to_cols ();
+ break;
+ }
- rod.columnize ();
- return rod;
+ /*
+ this grob doesn't cause a constraint. We look further until we
+ find one that does.
+ */
+ }
}
-
-Array<Rod>
-Separating_group_spanner::get_rods () const
+MAKE_SCHEME_CALLBACK (Separating_group_spanner, set_spacing_rods, 1);
+SCM
+Separating_group_spanner::set_spacing_rods (SCM smob)
{
- Array<Rod> a;
-
- for (SCM s = get_elt_pointer ("elements"); gh_pair_p (s) && gh_pair_p (gh_cdr (s)); s = gh_cdr (s))
+ Grob *me = unsmob_grob (smob);
+
+ /*
+ Ugh: padding is added doubly, also for SeparationItem
+ */
+ Real padding = robust_scm2double (me->get_property ("padding"), 0.1);
+
+ for (SCM s = me->get_property ("elements"); scm_is_pair (s) && scm_is_pair (scm_cdr (s)); s = scm_cdr (s))
{
/*
Order of elements is reversed!
- */
- SCM elt = gh_cadr (s);
- SCM next_elt = gh_car (s);
-
- Single_malt_grouping_item *l = dynamic_cast<Single_malt_grouping_item*> (unsmob_element (elt));
- Single_malt_grouping_item *r = dynamic_cast<Single_malt_grouping_item*> (unsmob_element ( next_elt));
+ */
+ SCM elt = scm_car (s);
+ Item *r = unsmob_item (elt);
- if (!r || !l)
+ if (!r)
continue;
-
- Single_malt_grouping_item *lb
- = dynamic_cast<Single_malt_grouping_item*>(l->find_prebroken_piece (RIGHT));
-
- Single_malt_grouping_item *rb
- = dynamic_cast<Single_malt_grouping_item*>(r->find_prebroken_piece (LEFT));
-
- a.push (make_rod(l, r));
- if (lb)
- {
- Rod rod(make_rod (lb, r));
- a.push (rod);
- }
-
+
+ Item *rb
+ = dynamic_cast<Item *> (r->find_prebroken_piece (LEFT));
+
+ find_rods (r, scm_cdr (s), padding);
if (rb)
- {
- a.push (make_rod (l, rb));
- }
-
- if (lb && rb)
- {
- Rod rod(make_rod (lb, rb));
- a.push (rod);
- }
+ find_rods (rb, scm_cdr (s), padding);
}
- /*
- We've done our job, so we get lost.
- */
- for (SCM s = get_elt_pointer ("elements"); gh_pair_p (s); s = gh_cdr (s))
- {
- Item * it =dynamic_cast<Item*>(unsmob_element (gh_car (s)));
- if (it && it->broken_b ())
- {
- it->find_prebroken_piece (LEFT) ->suicide ();
- it->find_prebroken_piece (RIGHT)->suicide ();
- }
- it->suicide ();
- }
-
- ((Separating_group_spanner *)this)->suicide ();
-
- return a;
+ return SCM_UNSPECIFIED;
}
void
-Separating_group_spanner::add_spacing_unit (Single_malt_grouping_item*i)
+Separating_group_spanner::add_spacing_unit (Grob *me, Item *i)
{
- Pointer_group_interface (this, "elements").add_element (i);
- add_dependency (i);
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), i);
+ me->add_dependency (i);
}
-
-Separating_group_spanner::Separating_group_spanner ()
-{
- set_elt_pointer ("elements", SCM_EOL);
-}
+ADD_INTERFACE (Separating_group_spanner, "separation-spanner-interface",
+ "A spanner that calculates spacing constraints (\"rods\") "
+ "using the @code{separation-item-interface} grobs in @code{elements}.",
+ "elements padding");