source file of the GNU LilyPond music typesetter
- (c) 1999 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"
-#include "dimension-cache.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_staffline (Grob*me)
+{
+ return on_staffline (me, (int) rint (get_position (me)));
+}
-int
-Staff_symbol_referencer::lines_i () const
+bool
+Staff_symbol_referencer::on_staffline (Grob*me, int pos)
{
- Staff_symbol *st = staff_symbol_l ();
- return st ? st->no_lines_i_ : 5;
+ int sz = line_count (me)-1;
+ return ((pos + sz) % 2) == 0;
}
-Staff_symbol*
-Staff_symbol_referencer::staff_symbol_l () const
+Grob*
+Staff_symbol_referencer::get_staff_symbol (Grob*me)
{
- SCM st = get_elt_property ("staff-symbol");
- return dynamic_cast<Staff_symbol* > (unsmob_element(st));
+ SCM st = me->get_grob_property ("staff-symbol");
+ return unsmob_grob (st);
}
Real
-Staff_symbol_referencer::staff_line_leading_f () const
+Staff_symbol_referencer::staff_space (Grob*me)
{
- Staff_symbol * st = staff_symbol_l ();
+ Grob * st = get_staff_symbol (me);
if (st)
- return st->staff_line_leading_f_;
- else if (pscore_l_ && paper_l ())
- paper_l ()->get_var ("interline");
-
- return 0.0;
+ 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 () const
+Staff_symbol_referencer::get_position (Grob*me)
{
Real p =0.0;
- SCM pos = get_elt_property ("staff-position");
- if (gh_number_p (pos))
- p = gh_scm2double (pos);
-
- Staff_symbol * st = staff_symbol_l ();
- if (st)
+ 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;
+
+ 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!
*/
-Real
-Staff_symbol_referencer::callback (Dimension_cache const * c)
+MAKE_SCHEME_CALLBACK (Staff_symbol_referencer,callback,2);
+SCM
+Staff_symbol_referencer::callback (SCM element_smob, SCM)
{
- 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");
+ Grob *me = unsmob_grob (element_smob);
+
+ SCM pos = me->get_grob_property ("staff-position");
Real off =0.0;
if (gh_number_p (pos))
{
- off = gh_scm2double (pos) * ref->staff_line_leading_f () /2.0;
+ Real space = Staff_symbol_referencer::staff_space (me);
+ off = gh_scm2double (pos) * space/2.0;
+ me->set_grob_property ("staff-position", gh_int2scm (0));
}
- sc->set_elt_property ("staff-position", gh_double2scm (0.0));
- return off;
+ return gh_double2scm (off);
}
+ /*
+
+ This sets the position relative to the center of the staff symbol.
+
+ The function is hairy, because it can be callled 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);
+ Grob * st = get_staff_symbol (me);
+ if (st && me->common_refpoint (st, Y_AXIS))
+ {
+ Real oldpos = get_position (me);
+ me->set_grob_property ("staff-position", gh_double2scm (p - oldpos));
+ }
else
{
- // SCM pos = get_elt_property ("staff-position");
- set_elt_property ("staff-position",
- gh_double2scm (p));
- // gh_double2scm (p + gh_scm2double (pos)));
+ me->set_grob_property ("staff-position",
+ gh_double2scm (p));
+
}
+
+ if (me->has_offset_callback_b (Staff_symbol_referencer::callback_proc, Y_AXIS))
+ return ;
+
+ me->add_offset_callback (Staff_symbol_referencer::callback_proc, 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",
+ "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");
projects / lilypond.git / blobdiff