source file of the GNU LilyPond music typesetter
- (c) 1999--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include <math.h>
#include "staff-symbol-referencer.hh"
#include "staff-symbol.hh"
#include "paper-def.hh"
-
-bool
-Staff_symbol_referencer::has_interface (Grob*e)
-{
- return unsmob_grob (e->get_grob_property ("staff-symbol"))
- || gh_number_p (e->get_grob_property ("staff-position"));
-}
+#include "libc-extension.hh"
+
int
Staff_symbol_referencer::line_count (Grob*me)
{
- Grob *st = staff_symbol_l (me);
+ Grob *st = get_staff_symbol (me);
return st ? Staff_symbol::line_count (st) : 0;
}
bool
Staff_symbol_referencer::on_staffline (Grob*me)
{
- return on_staffline (me, (int) rint (position_f (me)));
+ return on_staffline (me, (int) rint (get_position (me)));
}
bool
}
Grob*
-Staff_symbol_referencer::staff_symbol_l (Grob*me)
+Staff_symbol_referencer::get_staff_symbol (Grob*me)
{
SCM st = me->get_grob_property ("staff-symbol");
- return unsmob_grob(st);
+ return unsmob_grob (st);
}
Real
Staff_symbol_referencer::staff_space (Grob*me)
{
- Grob * st = staff_symbol_l (me);
+ Grob * st = get_staff_symbol (me);
if (st)
return Staff_symbol::staff_space (st);
-
return 1.0;
}
+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->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+}
Real
-Staff_symbol_referencer::position_f (Grob*me)
+Staff_symbol_referencer::get_position (Grob*me)
{
Real p =0.0;
- Grob * st = staff_symbol_l (me);
+ Grob * st = get_staff_symbol (me);
Grob * c = st ? me->common_refpoint (st, Y_AXIS) : 0;
if (st && c)
{
- st->relative_coordinate (c, Y_AXIS);
p += 2.0 * y / Staff_symbol::staff_space (st);
+ return p;
}
- else
- {
- SCM pos = me->get_grob_property ("staff-position");
- if (gh_number_p (pos))
- return gh_scm2double (pos);
- }
-
- return p;
+
+ return robust_scm2double ( me->get_grob_property ("staff-position"), p);
}
+LY_DEFINE(ly_grob_staff_position,
+ "ly:grob-staff-position",
+ 1, 0,0, (SCM sg),
+ "Return the Y-position of this grob relative to the staff.")
+{
+ Grob * g = unsmob_grob (sg);
+
+ SCM_ASSERT_TYPE (g, sg, SCM_ARG1, __FUNCTION__, "grob");
+ Real pos = Staff_symbol_referencer::get_position (g);
+
+ if (fabs (rint (pos) -pos) < 1e-6) // ugh.
+ return gh_int2scm ((int) my_round (pos));
+ else
+ return gh_double2scm (pos);
+}
+
/*
should use offset callback!
*/
-MAKE_SCHEME_CALLBACK(Staff_symbol_referencer,callback,2);
+MAKE_SCHEME_CALLBACK (Staff_symbol_referencer,callback,2);
SCM
-Staff_symbol_referencer::callback (SCM element_smob, SCM )
+Staff_symbol_referencer::callback (SCM element_smob, SCM)
{
Grob *me = unsmob_grob (element_smob);
-
SCM pos = me->get_grob_property ("staff-position");
Real off =0.0;
if (gh_number_p (pos))
{
Real space = Staff_symbol_referencer::staff_space (me);
off = gh_scm2double (pos) * space/2.0;
+ me->set_grob_property ("staff-position", gh_int2scm (0));
}
- me->set_grob_property ("staff-position", gh_double2scm (0.0));
-
return gh_double2scm (off);
}
void
Staff_symbol_referencer::set_position (Grob*me,Real p)
{
- Grob * st = staff_symbol_l (me);
- if (st && me->common_refpoint(st, Y_AXIS))
+ Grob * st = get_staff_symbol (me);
+ if (st && me->common_refpoint (st, Y_AXIS))
{
- Real oldpos = position_f (me);
+ Real oldpos = get_position (me);
me->set_grob_property ("staff-position", gh_double2scm (p - oldpos));
}
else
}
/*
- half of the height, in staff space.
- */
+ 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;
+ return (line_count (me) -1) / 2.0;
}
int
compare_position (Grob *const &a, Grob * const &b)
{
- return sign (Staff_symbol_referencer::position_f((Grob*)a) -
- Staff_symbol_referencer::position_f((Grob*)b));
-}
-
-
-void
-Staff_symbol_referencer::set_interface (Grob * e)
-{
- if (!gh_number_p (e->get_grob_property ("staff-position")))
- e->set_grob_property ("staff-position", gh_double2scm (0.0));
-
- e->add_offset_callback (Staff_symbol_referencer::callback_proc, Y_AXIS);
+ 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",
+ "Object whose Y position is meaning with reference to a staff "
+"symbol. Objects that have this interface should include "
+"Staff_symbol_referencer::callback in their Y-offset-callback. "
+,
+ "staff-position");