source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "span-bar.hh"
void
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,brew_molecule,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::brew_molecule (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_str = ly_scm2string (glyph);
+
+ // compose span_bar_mol
+ Molecule 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.empty_b ())
+ continue;
+
+ if (!prev_extent.empty_b ())
+ {
+ Interval l(prev_extent [UP],
+ ext[DOWN]);
+
+ Molecule interbar
+ = Bar::compound_barline (staff_bar, glyph_str, l.length());
+ interbar.translate_axis (l.center (), Y_AXIS);
+ span_bar_mol.add_molecule (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)
{
/*
urg.
- */
+ */
Molecule m = Bar::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)
{
/*
no need to call Bar::before_line_breaking (), because the info
- in ELEMENTS already has been procced by Bar::before_line_breaking().
- */
+ in ELEMENTS already has been procced by Bar::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)
interval that we span. */
if (i.empty_b ())
{
- me->suicide();
+ me->suicide ();
return gh_double2scm (0.0);
}
/*
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.
+ center_on_spanned_callback () as well.
*/
if (!gh_pair_p (me->get_grob_property ("elements")))
Span_bar::evaluate_glyph (Grob*me)
{
SCM elts = me->get_grob_property ("elements");
- Grob * b = unsmob_grob (gh_car (elts));
- SCM glsym =ly_symbol2scm ("glyph");
- SCM gl =b ->get_grob_property (glsym);
+ 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_grob_property (glsym), gl) != SCM_BOOL_T)
- me->set_grob_property (glsym, gl);
+ gl = ly_str02scm (type.ch_C ());
+ 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 (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)
{
{
/*
This happens if the bars are hara-kiried from under us.
- */
+ */
me->suicide ();
return gh_double2scm (-1);
}
projects / lilypond.git / blobdiff