2 stem-tremolo.cc -- implement Stem_tremolo
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "stem-tremolo.hh"
13 #include "paper-def.hh"
17 #include "staff-symbol-referencer.hh"
18 #include "directional-element-interface.hh"
22 lengthen stem if necessary
26 Stem_tremolo::set_interface (Score_element *me)
28 me->set_interface (ly_symbol2scm ("stem-tremolo"));
32 Stem_tremolo::has_interface (Score_element *me)
34 return me->has_interface (ly_symbol2scm ("stem-tremolo"));
39 Stem_tremolo::dim_callback (Score_element * se, Axis )
41 Real space = Staff_symbol_referencer::staff_space (se);
42 return Interval (-space, space);
47 MAKE_SCHEME_CALLBACK(Stem_tremolo,brew_molecule);
49 Stem_tremolo::brew_molecule (SCM smob)
51 Score_element *me= unsmob_element (smob);
52 Score_element * stem = unsmob_element (me->get_elt_property ("stem"));
53 Score_element * beam = Stem::beam_l (stem);
59 SCM s = beam->get_elt_property ("height");
61 dy = gh_scm2double (s);
62 Real dx = Beam::last_visible_stem (beam)->relative_coordinate (0, X_AXIS)
63 - Beam::first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
64 dydx = dx ? dy/dx : 0;
70 Real ss = Staff_symbol_referencer::staff_space (stem);
71 Real thick = gh_scm2double (me->get_elt_property ("beam-thickness"));
72 Real width = gh_scm2double (me->get_elt_property ("beam-width"));
76 Molecule a (me->lookup_l ()->beam (dydx, width, thick));
77 a.translate (Offset (-width/2, width / 2 * dydx));
80 SCM s = me->get_elt_property ("tremolo-flags");
82 tremolo_flags = gh_scm2int (s);
87 int mult = beam ? Beam::get_multiplicity (beam) : 0;
88 SCM space_proc = me->get_elt_property ("beam-space-function");
89 SCM space = gh_call1 (space_proc, gh_int2scm (mult));
90 Real interbeam_f = gh_scm2double (space) * ss;
94 for (int i = 0; i < tremolo_flags; i++)
97 b.translate_axis (interbeam_f * i, Y_AXIS);
101 mol.translate_axis (-mol.extent (Y_AXIS).center (), Y_AXIS);
104 // ugh, rather calc from Stem_tremolo_req
105 int beams_i = Stem::beam_count(stem, RIGHT) >? Stem::beam_count (stem, LEFT);
106 mol.translate (Offset(stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS),
107 Stem::stem_end_position (stem ) * ss / 2 -
108 Directional_element_interface::get (beam) * beams_i * interbeam_f));
113 Beams should intersect one beamthickness below stem end
115 Real dy = Stem::stem_end_position (stem ) * ss / 2;
116 dy -= mol.extent (Y_AXIS).length () / 2 * Stem::get_direction (stem );
119 uhg. Should use relative coords and placement
121 Real whole_note_correction;
122 if (Stem::invisible_b (stem ))
123 whole_note_correction = -Stem::get_direction (stem )
124 * Stem::support_head (stem )->extent (X_AXIS).length () / 2;
126 whole_note_correction = 0;
128 mol.translate (Offset (stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS) +
129 whole_note_correction, dy));
132 return mol.create_scheme();
137 Stem_tremolo::set_stem (Score_element*me,Score_element *s)
139 me->set_elt_property ("stem", s->self_scm ());