source file of the GNU LilyPond music typesetter
- (c) 1999--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1999--2004 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_interface::Staff_symbol_referencer_interface (Score_element const *sc)
+
+int
+Staff_symbol_referencer::line_count (Grob*me)
{
- elt_l_ = (Score_element*)sc;
+ Grob *st = get_staff_symbol (me);
+ return st ? Staff_symbol::line_count (st) : 0;
}
-void
-Staff_symbol_referencer_interface::set_interface ()
+bool
+Staff_symbol_referencer::on_staffline (Grob*me)
{
- elt_l_->set_elt_property ("staff-position", gh_double2scm (0.0));
- elt_l_->add_offset_callback (callback, Y_AXIS);
+ return on_staffline (me, (int) rint (get_position (me)));
}
bool
-Staff_symbol_referencer_interface::has_interface_b ()
+Staff_symbol_referencer::on_staffline (Grob*me, int pos)
{
- return unsmob_element (elt_l_->get_elt_pointer ("staff-symbol"))
- || gh_number_p (elt_l_->get_elt_property ("staff-position"));
+ int sz = line_count (me)-1;
+ return ((pos + sz) % 2) == 0;
}
-
-int
-Staff_symbol_referencer_interface::line_count () const
+Grob*
+Staff_symbol_referencer::get_staff_symbol (Grob*me)
{
- Staff_symbol *st = staff_symbol_l ();
- return st ? st->line_count () : 0;
+ SCM st = me->get_grob_property ("staff-symbol");
+ return unsmob_grob (st);
}
-Staff_symbol*
-Staff_symbol_referencer_interface::staff_symbol_l () const
+Real
+Staff_symbol_referencer::staff_space (Grob*me)
{
- SCM st = elt_l_->get_elt_pointer ("staff-symbol");
- return dynamic_cast<Staff_symbol* > (unsmob_element(st));
+ Grob * st = get_staff_symbol (me);
+ if (st)
+ return Staff_symbol::staff_space (st);
+
+ return 1.0;
}
Real
-Staff_symbol_referencer_interface::staff_space () const
+Staff_symbol_referencer::line_thickness (Grob*me)
{
- Staff_symbol * st = staff_symbol_l ();
+ Grob * st = get_staff_symbol (me);
if (st)
- return st->staff_space ();
- else if (elt_l_->pscore_l_ && elt_l_->paper_l ())
- return elt_l_->paper_l ()->get_var ("interline");
-
- return 0.0;
-}
+ return Staff_symbol::get_line_thickness (st);
+ return me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+}
Real
-Staff_symbol_referencer_interface::position_f () const
+Staff_symbol_referencer::get_position (Grob*me)
{
Real p =0.0;
- Staff_symbol * st = staff_symbol_l ();
- Score_element * c = st ? elt_l_->common_refpoint (st, Y_AXIS) : 0;
+ Grob * st = get_staff_symbol (me);
+ Grob * c = st ? me->common_refpoint (st, Y_AXIS) : 0;
if (st && c)
{
- Real y = elt_l_->relative_coordinate (c, Y_AXIS)
+ Real y = me->relative_coordinate (c, Y_AXIS)
- st->relative_coordinate (c, Y_AXIS);
- p += 2.0 * y / st->staff_space ();
+ p += 2.0 * y / Staff_symbol::staff_space (st);
+ return p;
}
- else
- {
- SCM pos = elt_l_->get_elt_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!
*/
-Real
-Staff_symbol_referencer_interface::callback (Score_element const* sc,Axis )
+MAKE_SCHEME_CALLBACK (Staff_symbol_referencer,callback,2);
+SCM
+Staff_symbol_referencer::callback (SCM element_smob, SCM)
{
- Score_element* me = (Score_element*)sc; // UGH.
-
- 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))
{
- Real space = staff_symbol_referencer (sc).staff_space ();
+ 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_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
*/
void
-Staff_symbol_referencer_interface::set_position (Real p)
+Staff_symbol_referencer::set_position (Grob*me,Real p)
{
- Staff_symbol * st = staff_symbol_l ();
- if (st && elt_l_->common_refpoint(st, Y_AXIS))
+ Grob * st = get_staff_symbol (me);
+ if (st && me->common_refpoint (st, Y_AXIS))
{
- Real oldpos = position_f ();
- elt_l_->set_elt_property ("staff-position", gh_double2scm (p - oldpos));
+ Real oldpos = get_position (me);
+ me->set_grob_property ("staff-position", gh_double2scm (p - oldpos));
}
else
{
- elt_l_->set_elt_property ("staff-position",
- gh_double2scm (p));
+ me->set_grob_property ("staff-position",
+ gh_double2scm (p));
}
- if (elt_l_->has_offset_callback_b (callback, Y_AXIS))
+ if (me->has_offset_callback_b (Staff_symbol_referencer::callback_proc, Y_AXIS))
return ;
- elt_l_->add_offset_callback (callback, Y_AXIS);
+ me->add_offset_callback (Staff_symbol_referencer::callback_proc, Y_AXIS);
}
-Staff_symbol_referencer_interface
-staff_symbol_referencer (Score_element const*e)
+/*
+ Half of the height, in staff space, i.e. 2.0 for a normal staff.
+*/
+Real
+Staff_symbol_referencer::staff_radius (Grob*me)
{
- return e; // gee, I'm so smart!
+ return (line_count (me) -1) / 2.0;
}
+
int
-compare_position (Score_element *const &a, Score_element * const &b)
+compare_position (Grob *const &a, Grob * const &b)
{
- Staff_symbol_referencer_interface s1(a);
- Staff_symbol_referencer_interface s2(b);
-
- return sign(s1.position_f () - s2.position_f ());
+ 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