source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2001 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 "warn.hh"
#include "axis-group-interface.hh"
#include "group-interface.hh"
-#include "score-element.hh"
+#include "grob.hh"
#include "bar.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);
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.
+ *
+ */
+SCM
+Span_bar::brew_molecule (SCM smobbed_me)
+{
+ Grob *me = unsmob_grob (smobbed_me);
+ Span_bar::evaluate_glyph(me);
+ SCM glyph = me->get_grob_property (ly_symbol2scm ("glyph"));
+ String glyph_str = ly_scm2string (glyph);
+ SCM first_elt = me->get_grob_property ("elements");
+
+ // first walk: compute axis_group parent via common_refpoint () on all bars
+ Grob *refpoint = 0;
+ int staff_bar_count = 0;
+ for (SCM elts = first_elt;
+ elts != SCM_EOL;
+ elts = gh_cdr (elts))
+ {
+ SCM smobbed_staff_bar = gh_car (elts);
+ Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
+ refpoint = (staff_bar_count > 0) ?
+ staff_bar->common_refpoint (refpoint, Y_AXIS) :
+ staff_bar;
+ staff_bar_count++;
+ }
+ /* assert: refpoint is an axis-group object */
+ Grob *axis_group = refpoint;
+
+ // second walk: collect span bar components;
+ // compute extent of axis_group
+ Real last_staff_bar_length;
+ Real *interstaff_bar_length = new Real[staff_bar_count];
+ Real *interstaff_bar_yoffs = new Real[staff_bar_count];
+ Molecule *interstaff_bar_molecule = new Molecule[staff_bar_count];
+ Real axis_group_extent = 0.0;
+ staff_bar_count = 0;
+ for (SCM elts = first_elt;
+ elts != SCM_EOL;
+ elts = gh_cdr (elts))
+ {
+ SCM smobbed_staff_bar = gh_car (elts);
+ SCM smobbed_staff_bar_molecule =
+ Bar::brew_molecule (smobbed_staff_bar);
+ Grob *staff_bar = unsmob_grob (smobbed_staff_bar);
+ interstaff_bar_yoffs[staff_bar_count] =
+ staff_bar->relative_coordinate (axis_group, (Axis)Y_AXIS);
+ if (smobbed_staff_bar_molecule != SCM_EOL)
+ {
+ Real staff_bar_length =
+ unsmob_molecule (smobbed_staff_bar_molecule)->
+ extent (Y_AXIS).length ();
+ if (staff_bar_count > 0)
+ {
+ // clone bar_molecule and fix y extent
+ interstaff_bar_length[staff_bar_count] =
+ interstaff_bar_yoffs[staff_bar_count] -
+ interstaff_bar_yoffs[staff_bar_count - 1] -
+ last_staff_bar_length;
+ SCM smobbed_interstaff_bar_molecule =
+ Bar::compound_barline (staff_bar, glyph_str,
+ interstaff_bar_length[staff_bar_count]).
+ smobbed_copy ();
+ interstaff_bar_molecule[staff_bar_count] =
+ *unsmob_molecule (smobbed_interstaff_bar_molecule);
+ }
+ else
+ {
+ interstaff_bar_molecule[staff_bar_count] = Molecule::Molecule ();
+ }
+ last_staff_bar_length = staff_bar_length;
+ }
+ else
+ {
+ last_staff_bar_length = 0;
+ interstaff_bar_length[staff_bar_count] = 0;
+ interstaff_bar_molecule[staff_bar_count] = Molecule::Molecule ();
+ }
+ axis_group_extent += last_staff_bar_length;
+ axis_group_extent += interstaff_bar_length[staff_bar_count];
+ staff_bar_count++;
+ }
+ // assert(abs(axis_group_extent -
+ // axis_group->extent (axis_group, Y_AXIS).length ()) < EPSILON);
+
+ // third walk: correct y axis on all span bar components;
+ // put all components into a single span bar molecule
+ Molecule span_bar_molecule = Molecule::Molecule ();
+ staff_bar_count = 0;
+ for (SCM elts = first_elt;
+ elts != SCM_EOL;
+ elts = gh_cdr (elts))
+ {
+ interstaff_bar_yoffs[staff_bar_count] +=
+ (axis_group_extent - interstaff_bar_length[staff_bar_count]) / 2;
+ interstaff_bar_molecule[staff_bar_count].//DEBUG
+ translate_axis (-1.0 PT, X_AXIS);//DEBUG
+ interstaff_bar_molecule[staff_bar_count].
+ translate_axis (interstaff_bar_yoffs[staff_bar_count], Y_AXIS);
+ span_bar_molecule.add_molecule (interstaff_bar_molecule[staff_bar_count]);
+ staff_bar_count++;
+ }
+
+ // clean-up & exit
+ delete interstaff_bar_length;
+ delete interstaff_bar_yoffs;
+ delete interstaff_bar_molecule;
+ return span_bar_molecule.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);
- 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().
+ 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)
{
- 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. */
-
+ if (i.empty_b ())
+ {
+ 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.
+ center_on_spanned_callback () as well.
*/
- if (!gh_pair_p (me->get_elt_property ("elements")))
+ 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 elts = me->get_grob_property ("elements");
+ Grob * b = unsmob_grob (gh_car (elts));
SCM glsym =ly_symbol2scm ("glyph");
- SCM gl =b ->get_elt_property (glsym);
+ SCM gl =b ->get_grob_property (glsym);
if (!gh_string_p (gl))
{
me->suicide ();
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 = ly_str02scm (type.ch_C ());
+ if (scm_equal_p (me->get_grob_property (glsym), gl) != SCM_BOOL_T)
+ me->set_grob_property (glsym, 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 ())
{
}
void
-Span_bar::set_interface (Score_element *me)
+Span_bar::set_interface (Grob *me)
{
Bar::set_interface (me);
}
bool
-Span_bar::has_interface (Score_element*m)
+Span_bar::has_interface (Grob*m)
{
return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));
}
projects / lilypond.git / blobdiff