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/*
stem-tremolo.cc -- implement Stem_tremolo
source file of the GNU LilyPond music typesetter
(c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "stem-tremolo.hh"
#include "spanner.hh"
#include "beam.hh"
#include "directional-element-interface.hh"
#include "item.hh"
#include "lookup.hh"
#include "output-def.hh"
#include "staff-symbol-referencer.hh"
#include "stem.hh"
#include "warn.hh"
MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_slope, 1)
SCM
Stem_tremolo::calc_slope (SCM smob)
{
Grob *me = unsmob_grob (smob);
Grob *stem = unsmob_grob (me->get_object ("stem"));
Spanner *beam = Stem::get_beam (stem);
if (beam)
{
Real dy = 0;
SCM s = beam->get_property ("quantized-positions");
if (is_number_pair (s))
dy = - scm_to_double (scm_car (s)) + scm_to_double (scm_cdr (s));
Grob *s2 = Beam::last_normal_stem (beam);
Grob *s1 = Beam::first_normal_stem (beam);
Grob *common = s1->common_refpoint (s2, X_AXIS);
Real dx = s2->relative_coordinate (common, X_AXIS) -
s1->relative_coordinate (common, X_AXIS);
return scm_from_double (dx ? dy / dx : 0);
}
else
/* down stems with flags should have more sloped trems (helps avoid
flag/stem collisions without making the stem very long) */
return scm_from_double (
(Stem::duration_log (stem) >= 3 && get_grob_direction (stem) == DOWN) ?
0.40 : 0.25);
}
MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_width, 1)
SCM
Stem_tremolo::calc_width (SCM smob)
{
Grob *me = unsmob_grob (smob);
Grob *stem = unsmob_grob (me->get_object ("stem"));
Direction stemdir = get_grob_direction (stem);
bool beam = Stem::get_beam (stem);
bool flag = Stem::duration_log (stem) >= 3 && !beam;
/* beamed stems and up-stems with flags have shorter tremolos */
return scm_from_double (((stemdir == UP && flag) || beam)? 1.0 : 1.5);
}
MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_style, 1)
SCM
Stem_tremolo::calc_style (SCM smob)
{
Grob *me = unsmob_grob (smob);
Grob *stem = unsmob_grob (me->get_object ("stem"));
Direction stemdir = get_grob_direction (stem);
bool beam = Stem::get_beam (stem);
bool flag = Stem::duration_log (stem) >= 3 && !beam;
return ly_symbol2scm (((stemdir == UP && flag) || beam) ? "rectangle" : "default");
}
Real
Stem_tremolo::get_beam_translation (Grob *me)
{
Grob *stem = unsmob_grob (me->get_object ("stem"));
Spanner *beam = Stem::get_beam (stem);
return (beam && beam->is_live ())
? Beam::get_beam_translation (beam)
: (Staff_symbol_referencer::staff_space (me)
* robust_scm2double (me->get_property ("length-fraction"), 1.0) * 0.81);
}
Stencil
Stem_tremolo::raw_stencil (Grob *me, Real slope, Direction stemdir)
{
Real ss = Staff_symbol_referencer::staff_space (me);
Real thick = robust_scm2double (me->get_property ("beam-thickness"), 1);
Real width = robust_scm2double (me->get_property ("beam-width"), 1);
Real blot = me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
SCM style = me->get_property ("style");
if (!scm_is_symbol (style))
style = ly_symbol2scm ("default");
width *= ss;
thick *= ss;
Stencil a;
if (style == ly_symbol2scm ("rectangle"))
a = Lookup::rotated_box (slope, width, thick, blot);
else
a = Lookup::beam (slope, width, thick, blot);
a.align_to (X_AXIS, CENTER);
a.align_to (Y_AXIS, CENTER);
int tremolo_flags = robust_scm2int (me->get_property ("flag-count"), 0);
if (!tremolo_flags)
{
programming_error ("no tremolo flags");
me->suicide ();
return Stencil ();
}
Real beam_translation = get_beam_translation (me);
Stencil mol;
for (int i = 0; i < tremolo_flags; i++)
{
Stencil b (a);
b.translate_axis (beam_translation * i * stemdir * -1, Y_AXIS);
mol.add_stencil (b);
}
return mol;
}
MAKE_SCHEME_CALLBACK (Stem_tremolo, height, 1);
SCM
Stem_tremolo::height (SCM smob)
{
Grob *me = unsmob_grob (smob);
/*
Cannot use the real slope, since it looks at the Beam.
*/
Stencil s1 (translated_stencil (me, 0.35));
return ly_interval2scm (s1.extent (Y_AXIS));
}
MAKE_SCHEME_CALLBACK (Stem_tremolo, width, 1);
SCM
Stem_tremolo::width (SCM smob)
{
Grob *me = unsmob_grob (smob);
/*
Cannot use the real slope, since it looks at the Beam.
*/
Stencil s1 (untranslated_stencil (me, 0.35));
return ly_interval2scm (s1.extent (X_AXIS));
}
Real
Stem_tremolo::vertical_length (Grob *me)
{
return untranslated_stencil (me, 0.35).extent (Y_AXIS).length ();
}
Stencil
Stem_tremolo::untranslated_stencil (Grob *me, Real slope)
{
Grob *stem = unsmob_grob (me->get_object ("stem"));
if (!stem)
{
programming_error ("no stem for stem-tremolo");
return Stencil ();
}
Direction stemdir = get_grob_direction (stem);
if (!stemdir)
stemdir = UP;
bool whole_note = Stem::duration_log (stem) <= 0;
/* for a whole note, we position relative to the notehead, so we want the
stencil aligned on the flag closest to the head */
Direction stencil_dir = whole_note ? -stemdir : stemdir;
return raw_stencil (me, slope, stencil_dir);
}
Stencil
Stem_tremolo::translated_stencil (Grob *me, Real slope)
{
Stencil mol = untranslated_stencil (me, slope);
Grob *stem = unsmob_grob (me->get_object ("stem"));
if (!stem)
return Stencil ();
Direction stemdir = get_grob_direction (stem);
if (stemdir == 0)
stemdir = UP;
Spanner *beam = Stem::get_beam (stem);
Real beam_translation = get_beam_translation (me);
int beam_count = beam ? (Stem::beam_multiplicity (stem).length () + 1) : 0;
Real ss = Staff_symbol_referencer::staff_space (me);
Real end_y
= Stem::stem_end_position (stem) * ss / 2
- stemdir * max (beam_count, 1) * beam_translation;
if (!beam && Stem::duration_log (stem) >= 3)
{
end_y -= stemdir * (Stem::duration_log (stem) - 2) * beam_translation;
if (stemdir == UP)
end_y -= stemdir * beam_translation * 0.5;
}
bool whole_note = Stem::duration_log (stem) <= 0;
if (whole_note)
{
/* we shouldn't position relative to the end of the stem since the stem
is invisible */
vector<int> nhp = Stem::note_head_positions (stem);
Real note_head = (stemdir == UP ? nhp.back () : nhp[0]) * ss / 2;
end_y = note_head + stemdir * 1.5;
}
mol.translate_axis (end_y, Y_AXIS);
return mol;
}
MAKE_SCHEME_CALLBACK (Stem_tremolo, print, 1);
SCM
Stem_tremolo::print (SCM grob)
{
Grob *me = unsmob_grob (grob);
Stencil s = translated_stencil (me, robust_scm2double (me->get_property ("slope"), 0.25));
return s.smobbed_copy ();
}
ADD_INTERFACE (Stem_tremolo,
"A beam slashing a stem to indicate a tremolo. The property"
" @code{style} can be @code{default} or @code{rectangle}.",
/* properties */
"beam-thickness "
"beam-width "
"flag-count "
"length-fraction "
"stem "
"style "
"slope "
);
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