/*
- break-align-item.cc -- implement Break_align_item
+ break-align-item.cc -- implement Break_align_interface
source file of the GNU LilyPond music typesetter
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
+
+#include <math.h>
+#include <libc-extension.hh>
+
+#include "side-position-interface.hh"
+#include "axis-group-interface.hh"
+#include "warn.hh"
+#include "lily-guile.hh"
#include "break-align-item.hh"
+#include "dimensions.hh"
+#include "paper-def.hh"
+#include "paper-column.hh"
+#include "group-interface.hh"
+#include "align-interface.hh"
+
+MAKE_SCHEME_CALLBACK(Break_align_interface,before_line_breaking);
+
+SCM
+Break_align_interface::before_line_breaking (SCM smob)
+{
+ Score_element* me = unsmob_element (smob);
+ do_alignment (me);
+ return SCM_UNSPECIFIED;
+}
+
+Real
+Break_align_interface::alignment_callback (Score_element*c, Axis a)
+{
+ assert (a == X_AXIS);
+ Score_element *par = c->parent_l (a);
+ if (par && !to_boolean (par->get_elt_property ("break-alignment-done")))\
+ {
+ par->set_elt_property ("break-alignment-done", SCM_BOOL_T);
+ Break_align_interface::do_alignment (par);
+ }
+
+ return 0.0;
+}
+
+Real
+Break_align_interface::self_align_callback (Score_element *me, Axis a)
+{
+ assert (a == X_AXIS);
+
+ Item* item = dynamic_cast<Item*> (me);
+ Direction bsd = item->break_status_dir();
+ if (bsd == LEFT)
+ {
+ me->set_elt_property ("self-alignment-X", gh_int2scm (RIGHT));
+ }
+
+ return Side_position::aligned_on_self (me, a);
+}
+
+void
+Break_align_interface::add_element (Score_element*me, Score_element *toadd)
+{
+ toadd->add_offset_callback (alignment_callback, X_AXIS);
+ Axis_group_interface::add_element (me, toadd);
+}
+
+void
+Break_align_interface::do_alignment (Score_element *me)
+{
+ Item * item = dynamic_cast<Item*> (me);
+ Item *column = item->column_l ();
+
+ Real interline= me->paper_l ()->get_var ("staffspace");
+ Link_array<Score_element> elems;
+ Link_array<Score_element> all_elems
+ = Pointer_group_interface__extract_elements (me, (Score_element*)0,
+ "elements");
+
+ for (int i=0; i < all_elems.size(); i++)
+ {
+ Interval y = all_elems[i]->extent(X_AXIS);
+ if (!y.empty_b())
+ elems.push (dynamic_cast<Score_element*> (all_elems[i]));
+ }
+
+ if (!elems.size ())
+ return;
+
+ SCM symbol_list = SCM_EOL;
+ Array<Real> dists;
+ SCM current_origin = ly_symbol2scm ("none");
+ for (int i=0; i <= elems.size (); i++)
+ {
+ Score_element *next_elt = i < elems.size ()
+ ? elems[i]
+ : 0 ;
+
+ SCM next_origin;
+
+ if (next_elt)
+ {
+ next_origin = next_elt->get_elt_property ("break-align-symbol");
+ next_origin =
+ gh_symbol_p (next_origin)?
+ next_origin : ly_symbol2scm ("none")
+;
+ }
+ else
+ next_origin = ly_symbol2scm ("begin-of-note");
+
+ SCM e = scm_assoc (scm_listify (current_origin,
+ next_origin,
+ SCM_UNDEFINED),
+ scm_eval2 (ly_symbol2scm ("space-alist"), SCM_EOL));
+
+ SCM extra_space;
+ if (e != SCM_BOOL_F)
+ {
+ extra_space = gh_cdr (e);
+ }
+ else
+ {
+ warning (_f ("unknown spacing pair `%s', `%s'",
+ ly_symbol2string (current_origin),
+ ly_symbol2string (next_origin)));
+ extra_space = scm_listify (ly_symbol2scm ("minimum-space"), gh_double2scm (0.0), SCM_UNDEFINED);
+ }
+
+ SCM symbol = gh_car (extra_space);
+ Real spc = gh_scm2double (gh_cadr(extra_space));
+ spc *= interline;
+
+ dists.push(spc);
+ symbol_list = gh_cons (symbol, symbol_list);
+ current_origin = next_origin;
+ }
+
+
+ // skip the first sym.
+ symbol_list = gh_cdr (scm_reverse (symbol_list));
+ for (int i=0; i <elems.size()-1; i++)
+ {
+ elems[i]->set_elt_property (gh_car (symbol_list),
+ scm_cons (gh_double2scm (0),
+ gh_double2scm (dists[i+1])));
+
+ symbol_list = gh_cdr (symbol_list);
+ }
+
+
+ // urg
+ SCM first_pair = elems[0]->get_elt_property ("minimum-space");
+ if (gh_pair_p (first_pair))
+ first_pair = first_pair;
+ else
+ first_pair = gh_cons (gh_double2scm (0.0), gh_double2scm (0.0));
+
+ scm_set_car_x (first_pair, gh_double2scm (-dists[0]));
+ elems[0]->set_elt_property ("minimum-space", first_pair);
+
+
+ /*
+ Force callbacks for alignment to be called
+ */
+ Align_interface::do_side_processing (me, X_AXIS);
+
+ Real pre_space = elems[0]->relative_coordinate (column, X_AXIS);
+
+ Real xl = elems[0]->extent (X_AXIS)[LEFT];
+ if (!isinf (xl))
+ pre_space += xl;
+ else
+ programming_error ("Infinity reached. ");
+
+ Real xr = elems.top ()->extent (X_AXIS)[RIGHT];
+ Real spring_len = elems.top ()->relative_coordinate (column, X_AXIS);
+ if (!isinf (xr))
+ spring_len += xr;
+ else
+ programming_error ("Infinity reached.");
+
+ Real stretch_distance =0.;
+
+ if (gh_car (symbol_list) == ly_symbol2scm ("extra-space"))
+ {
+ spring_len += dists.top ();
+ stretch_distance = dists.top ();
+ }
+ else if (gh_car (symbol_list) == ly_symbol2scm ("minimum-space"))
+ {
+ spring_len = spring_len >? dists.top ();
+ stretch_distance = spring_len;
+ }
+
+ /*
+ Hint the spacing engine how much space to put in.
+
+ The pairs are in the format of an interval (ie. CAR < CDR).
+ */
+ column->set_elt_property ("extra-space",
+ scm_cons (gh_double2scm (pre_space),
+ gh_double2scm (spring_len)));
+
+ column->set_elt_property ("stretch-distance",
+ gh_cons (gh_double2scm (-dists[0]),
+ gh_double2scm (stretch_distance)));
+
+
+}
+
void
-Break_align_item::do_pre_processing()
+Break_align_interface::set_interface (Score_element*me)
{
+ Align_interface::set_interface (me);
+ Align_interface::set_axis (me,X_AXIS);
- align_i_ = break_status_i();
- Horizontal_align_item::do_pre_processing();
+ me->add_offset_callback (Break_align_interface::self_align_callback, X_AXIS);
}
-IMPLEMENT_STATIC_NAME(Break_align_item);
-IMPLEMENT_IS_TYPE_B1(Break_align_item, Horizontal_align_item);
projects / lilypond.git / blobdiff