-/*
+/*
staff-symbol-referencer.cc -- implement Staff_symbol_referencer
-
+
source file of the GNU LilyPond music typesetter
-
- (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
- */
-#include <math.h>
+ (c) 1999--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
#include "staff-symbol-referencer.hh"
+
+
#include "staff-symbol.hh"
-#include "paper-def.hh"
-#include "dimension-cache.hh"
+#include "output-def.hh"
+#include "libc-extension.hh"
-Staff_symbol_referencer::Staff_symbol_referencer ()
+int
+Staff_symbol_referencer::line_count (Grob *me)
{
- set_elt_property ("staff-position", gh_double2scm (0.0));
- dim_cache_[Y_AXIS]->off_callbacks_.push (callback);
+ Grob *st = get_staff_symbol (me);
+ return st ? Staff_symbol::line_count (st) : 0;
}
+bool
+Staff_symbol_referencer::on_line (Grob *me)
+{
+ return on_line (me, (int) rint (get_position (me)));
+}
-int
-Staff_symbol_referencer::lines_i () const
+bool
+Staff_symbol_referencer::on_staff_line (Grob *me)
{
- Staff_symbol *st = staff_symbol_l ();
- return st ? st->no_lines_i_ : 5;
+ return on_staff_line (me, (int) rint (get_position (me)));
}
-Staff_symbol*
-Staff_symbol_referencer::staff_symbol_l () const
+bool
+Staff_symbol_referencer::on_line (Grob *me, int pos)
{
- SCM st = get_elt_property ("staff-symbol");
- return dynamic_cast<Staff_symbol* > (unsmob_element(st));
+ int sz = line_count (me) - 1;
+ return ((pos + sz) % 2) == 0;
}
-Real
-Staff_symbol_referencer::staff_line_leading_f () const
+bool
+Staff_symbol_referencer::on_staff_line (Grob *me, int pos)
{
- Staff_symbol * st = staff_symbol_l ();
- if (st)
- return st->staff_line_leading_f_;
- else if (pscore_l_ && paper_l ())
- paper_l ()->get_var ("interline");
-
- return 0.0;
+ return on_line (me, pos) && abs (pos) <= 2 * staff_radius (me);
}
+Grob *
+Staff_symbol_referencer::get_staff_symbol (Grob *me)
+{
+ if (Staff_symbol::has_interface (me))
+ return me;
+
+ SCM st = me->get_object ("staff-symbol");
+ return unsmob_grob (st);
+}
Real
-Staff_symbol_referencer::position_f () const
+Staff_symbol_referencer::staff_space (Grob *me)
{
- Real p =0.0;
- SCM pos = get_elt_property ("staff-position");
- if (gh_number_p (pos))
- p = gh_scm2double (pos);
+ Grob *st = get_staff_symbol (me);
+ if (st)
+ return Staff_symbol::staff_space (st);
+ return 1.0;
+}
- Staff_symbol * st = staff_symbol_l ();
+Real
+Staff_symbol_referencer::line_thickness (Grob *me)
+{
+ Grob *st = get_staff_symbol (me);
if (st)
+ return Staff_symbol::get_line_thickness (st);
+ return me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
+}
+
+Real
+Staff_symbol_referencer::get_position (Grob *me)
+{
+ Real p = 0.0;
+ Grob *st = get_staff_symbol (me);
+ Grob *c = st ? me->common_refpoint (st, Y_AXIS) : 0;
+ if (st && c)
{
- Score_element * c = common_refpoint (st, Y_AXIS);
- Real y = relative_coordinate (c, Y_AXIS)
+ Real y = me->relative_coordinate (c, Y_AXIS)
- st->relative_coordinate (c, Y_AXIS);
- p += 2.0 * y / staff_line_leading_f ();
+ p += 2.0 * y / Staff_symbol::staff_space (st);
+ return p;
}
- return p;
+ else if (!st)
+ return me->relative_coordinate (me->get_parent (Y_AXIS), Y_AXIS) * 2;
+ return robust_scm2double (me->get_property ("staff-position"), p);
}
+int
+Staff_symbol_referencer::get_rounded_position (Grob *me)
+{
+ return int (rint (get_position (me)));
+}
-
-/*
- should use offset callback!
- */
-Real
-Staff_symbol_referencer::callback (Dimension_cache const * c)
+MAKE_SCHEME_CALLBACK (Staff_symbol_referencer, callback, 1);
+SCM
+Staff_symbol_referencer::callback (SCM smob)
{
- Score_element * sc = dynamic_cast<Score_element*> (c->element_l ());
- Staff_symbol_referencer * ref = dynamic_cast<Staff_symbol_referencer*> (sc);
- SCM pos = sc->get_elt_property ("staff-position");
- Real off =0.0;
- if (gh_number_p (pos))
+ Grob *me = unsmob_grob (smob);
+
+ SCM pos = me->get_property ("staff-position");
+ Real off = 0.0;
+ if (scm_is_number (pos))
{
- off = gh_scm2double (pos) * ref->staff_line_leading_f () /2.0;
+ Real space = Staff_symbol_referencer::staff_space (me);
+ off = scm_to_double (pos) * space / 2.0;
+ me->set_property ("staff-position", scm_from_int (0));
}
- sc->set_elt_property ("staff-position", gh_double2scm (0.0));
- return off;
+ return scm_from_double (off);
}
+/* This sets the position relative to the center of the staff symbol.
+
+The function is hairy, because it can be called in two situations:
+
+1. There is no staff yet; we must set staff-position
+
+2. There is a staff, and perhaps someone even applied a
+translate_axis (). Then we must compensate for the translation
+
+In either case, we set a callback to be sure that our new position
+will be extracted from staff-position */
void
-Staff_symbol_referencer::set_position (Real p)
+Staff_symbol_referencer::set_position (Grob *me, Real p)
{
- Real halfspace = staff_line_leading_f ()* 0.5;
-
- translate_axis (- halfspace * position_f (), Y_AXIS);
- Staff_symbol *st = staff_symbol_l ();
- if (st)
- translate_axis (halfspace * p, Y_AXIS);
- else
+ Grob *st = get_staff_symbol (me);
+ Real oldpos = 0.0;
+ if (st && me->common_refpoint (st, Y_AXIS))
{
- // SCM pos = get_elt_property ("staff-position");
- set_elt_property ("staff-position",
- gh_double2scm (p));
- // gh_double2scm (p + gh_scm2double (pos)));
+ oldpos = get_position (me);
}
+
+
+ Real ss = Staff_symbol_referencer::staff_space (me);
+ me->translate_axis ((p - oldpos) * ss * 0.5, Y_AXIS);
+}
+
+/* Half of the height, in staff space, i.e. 2.0 for a normal staff. */
+Real
+Staff_symbol_referencer::staff_radius (Grob *me)
+{
+ return (line_count (me) - 1) / 2.0;
}
+int
+compare_position (Grob *const &a, Grob *const &b)
+{
+ return sign (Staff_symbol_referencer::get_position ((Grob *)a)
+ - Staff_symbol_referencer::get_position ((Grob *) b));
+}
+
+ADD_INTERFACE (Staff_symbol_referencer, "staff-symbol-referencer-interface",
+ "An object whose Y position is meant relative to a staff "
+ "symbol. "
+ "These usually have @code{Staff_symbol_referencer::callback} "
+ "in their @code{Y-offset-callbacks}. ",
+
+ /* properties */
+ "staff-position");
+
projects / lilypond.git / blobdiff