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"));
37 MAKE_SCHEME_CALLBACK(Stem_tremolo,dim_callback,2);
43 Stem_tremolo::dim_callback (SCM e, SCM )
45 Score_element * se = unsmob_element (e);
47 Real space = Staff_symbol_referencer::staff_space (se);
48 return ly_interval2scm ( Interval (-space, space));
53 MAKE_SCHEME_CALLBACK(Stem_tremolo,brew_molecule,1);
55 Stem_tremolo::brew_molecule (SCM smob)
57 Score_element *me= unsmob_element (smob);
58 Score_element * stem = unsmob_element (me->get_elt_property ("stem"));
59 Score_element * beam = Stem::beam_l (stem);
65 SCM s = beam->get_elt_property ("height");
67 dy = gh_scm2double (s);
68 Real dx = Beam::last_visible_stem (beam)->relative_coordinate (0, X_AXIS)
69 - Beam::first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
70 dydx = dx ? dy/dx : 0;
76 Real ss = Staff_symbol_referencer::staff_space (stem);
77 Real thick = gh_scm2double (me->get_elt_property ("beam-thickness"));
78 Real width = gh_scm2double (me->get_elt_property ("beam-width"));
82 Molecule a (Lookup::beam (dydx, width, thick));
83 a.translate (Offset (-width/2, width / 2 * dydx));
86 SCM s = me->get_elt_property ("tremolo-flags");
88 tremolo_flags = gh_scm2int (s);
93 int mult = beam ? Beam::get_multiplicity (beam) : 0;
94 SCM space_proc = me->get_elt_property ("beam-space-function");
95 SCM space = gh_call1 (space_proc, gh_int2scm (mult));
96 Real interbeam_f = gh_scm2double (space) * ss;
100 for (int i = 0; i < tremolo_flags; i++)
103 b.translate_axis (interbeam_f * i, Y_AXIS);
104 mol.add_molecule (b);
107 mol.translate_axis (-mol.extent (Y_AXIS).center (), Y_AXIS);
110 // ugh, rather calc from Stem_tremolo_req
111 int beams_i = Stem::beam_count(stem, RIGHT) >? Stem::beam_count (stem, LEFT);
112 mol.translate (Offset(stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS),
113 Stem::stem_end_position (stem ) * ss / 2 -
114 Directional_element_interface::get (beam) * beams_i * interbeam_f));
119 Beams should intersect one beamthickness below stem end
121 Real dy = Stem::stem_end_position (stem ) * ss / 2;
122 dy -= mol.extent (Y_AXIS).length () / 2 * Stem::get_direction (stem );
125 uhg. Should use relative coords and placement
127 Real whole_note_correction;
128 if (Stem::invisible_b (stem ))
130 Score_element *hed = Stem::support_head (stem );
131 whole_note_correction = -Stem::get_direction (stem )
132 *hed->extent (hed, X_AXIS).length () / 2;
135 whole_note_correction = 0;
137 mol.translate (Offset (stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS) +
138 whole_note_correction, dy));
141 return mol.create_scheme();
146 Stem_tremolo::set_stem (Score_element*me,Score_element *s)
148 me->set_elt_property ("stem", s->self_scm ());