source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "span-bar.hh"
-#include "font-metric.hh"
+#include "font-interface.hh"
#include "dimensions.hh"
#include "paper-def.hh"
-#include "molecule.hh"
+#include "stencil.hh"
#include "warn.hh"
#include "axis-group-interface.hh"
#include "group-interface.hh"
-#include "score-element.hh"
-#include "bar.hh"
+#include "grob.hh"
+#include "bar-line.hh"
void
-Span_bar::add_bar (Score_element*me, Score_element*b)
+Span_bar::add_bar (Grob*me, Grob*b)
{
- Pointer_group_interface::add_element (me,"elements", b);
+ Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), b);
me->add_dependency (b);
}
-MAKE_SCHEME_CALLBACK(Span_bar,width_callback,2);
+MAKE_SCHEME_CALLBACK (Span_bar,print,1);
+
+/* Limitations/Bugs:
+
+ (1) Elements from 'me->get_grob_property ("elements")' must be
+ ordered according to their y coordinates relative to their common
+ axis group parent. Otherwise, the computation goes mad.
+
+ (TODO:
+ apply a sort algorithm that ensures this precondition.) However,
+ until now, I have seen no case where lily has not fulfilled this
+ precondition.
+
+ (2) This method depends on bar_engraver not being removed from
+ staff context. If bar_engraver is removed, the size of the staff
+ lines is evaluated as 0, which results in a solid span bar line
+ with faulty y coordinate. */
+
+/* This routine was originally by Juergen Reuter, but it was a on the
+ bulky side. Rewritten by Han-Wen. */
+SCM
+Span_bar::print (SCM smobbed_me)
+{
+ Grob *me = unsmob_grob (smobbed_me);
+ SCM first_elt = me->get_grob_property ("elements");
+
+ /* compute common refpoint of elements */
+ Grob *refp = me;
+ for (SCM elts = first_elt; gh_pair_p (elts); elts = ly_cdr (elts))
+ {
+ SCM smobbed_staff_bar = ly_car (elts);
+ Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
+ refp = staff_bar->common_refpoint (refp, Y_AXIS);
+ }
+
+ Span_bar::evaluate_glyph (me);
+ SCM glyph = me->get_grob_property ("glyph");
+
+ /* glyph may not be a string, when ME is killed by Hara Kiri in
+ between. */
+ if (!gh_string_p (glyph))
+ return SCM_EOL;
+
+ String glyph_string = ly_scm2string (glyph);
+
+ /* compose span_bar_mol */
+ Stencil span_bar_mol;
+
+ Interval prev_extent;
+ for (SCM elts = first_elt; gh_pair_p (elts); elts = ly_cdr (elts))
+ {
+ SCM smobbed_staff_bar = ly_car (elts);
+ Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
+ Interval ext = staff_bar->extent (refp, Y_AXIS);
+ if (ext.is_empty ())
+ continue;
+
+ if (!prev_extent.is_empty ())
+ {
+ Interval l (prev_extent [UP],
+ ext[DOWN]);
+
+ if (l.is_empty ())
+ {
+ /* There is overlap between the bar lines. Do nothing. */
+ }
+ else
+ {
+ Stencil interbar = Bar_line::compound_barline (staff_bar,
+ glyph_string,
+ l.length ());
+ interbar.translate_axis (l.center (), Y_AXIS);
+ span_bar_mol.add_stencil (interbar);
+ }
+ }
+ prev_extent = ext;
+ }
+
+ span_bar_mol.translate_axis (- me->relative_coordinate (refp, Y_AXIS),
+ Y_AXIS);
+
+ return span_bar_mol.smobbed_copy ();
+}
+
+MAKE_SCHEME_CALLBACK (Span_bar,width_callback,2);
SCM
Span_bar::width_callback (SCM element_smob, SCM scm_axis)
{
- Score_element *se = unsmob_element (element_smob);
+ Grob *se = unsmob_grob (element_smob);
Axis a = (Axis) gh_scm2int (scm_axis);
assert (a == X_AXIS);
- String gl = ly_scm2string (se->get_elt_property ("glyph"));
+ String gl = ly_scm2string (se->get_grob_property ("glyph"));
/*
urg.
- */
- Molecule m = Bar::compound_barline (se, gl, 40 PT);
+ */
+ Stencil m = Bar_line::compound_barline (se, gl, 40 PT);
- return ly_interval2scm ( m.extent (X_AXIS));
+ return ly_interval2scm (m.extent (X_AXIS));
}
-MAKE_SCHEME_CALLBACK(Span_bar,before_line_breaking,1);
+MAKE_SCHEME_CALLBACK (Span_bar,before_line_breaking,1);
SCM
Span_bar::before_line_breaking (SCM smob)
{
- evaluate_empty (unsmob_element (smob));
- evaluate_glyph (unsmob_element (smob));
+ evaluate_empty (unsmob_grob (smob));
+ evaluate_glyph (unsmob_grob (smob));
- /*
- no need to call Bar::before_line_breaking (), because the info
- in ELEMENTS already has been procced by Bar::before_line_breaking().
- */
+ /* No need to call Bar_line::before_line_breaking (), because the info
+ in ELEMENTS already has been procced by
+ Bar_line::before_line_breaking (). */
return SCM_UNSPECIFIED;
}
-MAKE_SCHEME_CALLBACK(Span_bar,center_on_spanned_callback,2);
+MAKE_SCHEME_CALLBACK (Span_bar,center_on_spanned_callback,2);
+
SCM
Span_bar::center_on_spanned_callback (SCM element_smob, SCM axis)
{
- Score_element *me = unsmob_element (element_smob);
+ Grob *me = unsmob_grob (element_smob);
Axis a = (Axis) gh_scm2int (axis);
assert (a == Y_AXIS);
Interval i (get_spanned_interval (me));
- /*
- Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
- we have to translate ourselves to be in the center of the
- interval that we span. */
-
+ /* Bar_line::print delivers a barline of y-extent (-h/2,h/2), so
+ we have to translate ourselves to be in the center of the
+ interval that we span. */
+ if (i.is_empty ())
+ {
+ me->suicide ();
+ return gh_double2scm (0.0);
+ }
+
return gh_double2scm (i.center ());
}
void
-Span_bar::evaluate_empty (Score_element*me)
+Span_bar::evaluate_empty (Grob*me)
{
- /*
- TODO: filter all hara-kiried out of ELEMENS list, and then
- optionally do suicide. Call this cleanage function from
- center_on_spanned_callback() as well.
-
- */
- if (!gh_pair_p (me->get_elt_property ("elements")))
+ /* TODO: filter all hara-kiried out of ELEMENS list, and then
+ optionally do suicide. Call this cleanage function from
+ center_on_spanned_callback () as well. */
+ if (!gh_pair_p (me->get_grob_property ("elements")))
{
me->suicide ();
}
}
void
-Span_bar::evaluate_glyph (Score_element*me)
+Span_bar::evaluate_glyph (Grob*me)
{
- SCM elts = me->get_elt_property ("elements");
- Score_element * b = unsmob_element (gh_car (elts));
- SCM glsym =ly_symbol2scm ("glyph");
- SCM gl =b ->get_elt_property (glsym);
+ SCM elts = me->get_grob_property ("elements");
+ SCM glyph_symbol = ly_symbol2scm ("glyph");
+ SCM gl = SCM_EOL;
+
+ while (gh_pair_p (elts))
+ {
+ gl = unsmob_grob (gh_car (elts))
+ ->internal_get_grob_property (glyph_symbol);
+ if (gh_string_p (gl))
+ break;
+ elts =gh_cdr (elts);
+ }
+
if (!gh_string_p (gl))
{
me->suicide ();
- return ;
+ return;
}
-
- String type = ly_scm2string (gl);
+ String type = ly_scm2string (gl);
if (type == "|:")
{
type = ".|";
type = ".|.";
}
- gl = ly_str02scm (type.ch_C());
- if (scm_equal_p (me->get_elt_property (glsym), gl) != SCM_BOOL_T)
- me->set_elt_property (glsym, gl);
+ gl = scm_makfrom0str (type.to_str0 ());
+ if (scm_equal_p (me->internal_get_grob_property (glyph_symbol), gl)
+ != SCM_BOOL_T)
+ me->internal_set_grob_property (glyph_symbol, gl);
}
Interval
-Span_bar::get_spanned_interval (Score_element*me)
+Span_bar::get_spanned_interval (Grob*me)
{
- return ly_scm2interval (Axis_group_interface::group_extent_callback (me->self_scm(), gh_int2scm (Y_AXIS)));
+ return ly_scm2interval (Axis_group_interface::group_extent_callback
+ (me->self_scm (), gh_int2scm (Y_AXIS)));
}
-MAKE_SCHEME_CALLBACK(Span_bar,get_bar_size,1);
+MAKE_SCHEME_CALLBACK (Span_bar,get_bar_size,1);
SCM
Span_bar::get_bar_size (SCM smob)
{
- Score_element* me = unsmob_element (smob);
+ Grob* me = unsmob_grob (smob);
Interval iv (get_spanned_interval (me));
- if (iv.empty_b ())
+ if (iv.is_empty ())
{
- /*
- This happens if the bars are hara-kiried from under us.
- */
+ /* This happens if the bars are hara-kiried from under us. */
me->suicide ();
return gh_double2scm (-1);
}
return gh_double2scm (iv.length ());
}
-void
-Span_bar::set_interface (Score_element *me)
-{
- Bar::set_interface (me);
-
- me->set_interface (ly_symbol2scm ("span-bar-interface"));
- me->set_extent_callback (SCM_EOL, Y_AXIS);
-}
-bool
-Span_bar::has_interface (Score_element*m)
-{
- return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));
-}
+
+ADD_INTERFACE (Span_bar,"span-bar-interface",
+ "A bar line that spans other barlines (typically used to get cross-staff barlines.",
+ "");
+
+
projects / lilypond.git / blobdiff