source file of the GNU LilyPond music typesetter
- (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1999--2002 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"
-
-Staff_symbol_referencer::Staff_symbol_referencer ()
+
+bool
+Staff_symbol_referencer::has_interface (Grob*e)
{
- staff_sym_l_ =0;
- position_i_ =0;
+ return unsmob_grob (e->get_grob_property ("staff-symbol"))
+ || gh_number_p (e->get_grob_property ("staff-position"));
}
-void
-Staff_symbol_referencer::do_substitute_element_pointer (Score_element *o, Score_element*n)
+int
+Staff_symbol_referencer::line_count (Grob*me)
{
- if (staff_sym_l_ == o)
- {
- staff_sym_l_ = dynamic_cast<Staff_symbol*> (n);
- }
+ Grob *st = staff_symbol_l (me);
+ return st ? Staff_symbol::line_count (st) : 0;
}
-int
-Staff_symbol_referencer::lines_i () const
+bool
+Staff_symbol_referencer::on_staffline (Grob*me)
{
- return (staff_sym_l_) ? staff_sym_l_->no_lines_i_ : 5;
+ return on_staffline (me, (int) rint (position_f (me)));
}
-void
-Staff_symbol_referencer::set_staff_symbol (Staff_symbol*s)
+bool
+Staff_symbol_referencer::on_staffline (Grob*me, int pos)
{
- staff_sym_l_ =s;
- add_dependency (s);
+ int sz = line_count (me)-1;
+ return ((pos + sz) % 2) == 0;
}
-Staff_symbol*
-Staff_symbol_referencer::staff_symbol_l () const
+Grob*
+Staff_symbol_referencer::staff_symbol_l (Grob*me)
{
- return staff_sym_l_;
+ 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)
{
- return (staff_sym_l_) ? staff_sym_l_->staff_line_leading_f_ : paper_l ()->get_var ("interline");
+ Grob * st = staff_symbol_l (me);
+ if (st)
+ return Staff_symbol::staff_space (st);
+
+ return 1.0;
}
Real
-Staff_symbol_referencer::position_f () const
+Staff_symbol_referencer::position_f (Grob*me)
{
- Real p = position_i_;
- if (staff_sym_l_ )
+ Real p =0.0;
+ Grob * st = staff_symbol_l (me);
+ Grob * c = st ? me->common_refpoint (st, Y_AXIS) : 0;
+ if (st && c)
{
- Graphical_element * c = common_refpoint (staff_sym_l_, Y_AXIS);
- Real y = relative_coordinate (c, Y_AXIS) - staff_sym_l_->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);
+ }
+ else
+ {
+ SCM pos = me->get_grob_property ("staff-position");
+ if (gh_number_p (pos))
+ return gh_scm2double (pos);
}
+
return p;
}
-void
-Staff_symbol_referencer::do_pre_processing ()
+/*
+ should use offset callback!
+ */
+MAKE_SCHEME_CALLBACK (Staff_symbol_referencer,callback,2);
+SCM
+Staff_symbol_referencer::callback (SCM element_smob, SCM)
{
- translate_axis (position_i_ * staff_line_leading_f () /2.0, Y_AXIS);
- position_i_ =0;
+ 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_double2scm (0.0));
+ }
+
+ 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 (int p)
+Staff_symbol_referencer::set_position (Grob*me,Real p)
{
- /*
- UGH. Use position_f() as well.
- */
- position_i_ = p;
-
+ Grob * st = staff_symbol_l (me);
+ if (st && me->common_refpoint (st, Y_AXIS))
+ {
+ Real oldpos = position_f (me);
+ me->set_grob_property ("staff-position", gh_double2scm (p - oldpos));
+ }
+ else
+ {
+ 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.
+ */
+Real
+Staff_symbol_referencer::staff_radius (Grob*me)
+{
+ return (line_count (me) -1) / 2;
}
+
+
+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));
+}
+
+
+
+
+#define has_interface ugly_hack
+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