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_elt_property ("stem", SCM_EOL);
33 Stem_tremolo::dim_callback (Score_element * se, Axis )
35 Real space = Staff_symbol_referencer::staff_space (se);
36 return Interval (-space, space);
41 MAKE_SCHEME_CALLBACK(Stem_tremolo,brew_molecule);
43 Stem_tremolo::brew_molecule (SCM smob)
45 Score_element *me= unsmob_element (smob);
46 Score_element * stem = unsmob_element (me->get_elt_property ("stem"));
47 Score_element * beam = Stem::beam_l (stem);
53 SCM s = beam->get_elt_property ("height");
55 dy = gh_scm2double (s);
56 Real dx = Beam::last_visible_stem (beam)->relative_coordinate (0, X_AXIS)
57 - Beam::first_visible_stem (beam)->relative_coordinate (0, X_AXIS);
58 dydx = dx ? dy/dx : 0;
64 Real ss = Staff_symbol_referencer::staff_space (stem);
65 Real thick = gh_scm2double (me->get_elt_property ("beam-thickness"));
66 Real width = gh_scm2double (me->get_elt_property ("beam-width"));
70 Molecule a (me->lookup_l ()->beam (dydx, width, thick));
71 a.translate (Offset (-width/2, width / 2 * dydx));
74 SCM s = me->get_elt_property ("tremolo-flags");
76 tremolo_flags = gh_scm2int (s);
81 int mult = beam ? Beam::get_multiplicity (beam) : 0;
82 Real interbeam_f = me->paper_l ()->interbeam_f (mult);
84 for (int i = 0; i < tremolo_flags; i++)
87 b.translate_axis (interbeam_f * i, Y_AXIS);
91 mol.translate_axis (-mol.extent (Y_AXIS).center (), Y_AXIS);
94 // ugh, rather calc from Stem_tremolo_req
95 int beams_i = Stem::beam_count(stem, RIGHT) >? Stem::beam_count (stem, LEFT);
96 mol.translate (Offset(stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS),
97 Stem::stem_end_position (stem ) * ss / 2 -
98 Directional_element_interface::get (beam) * beams_i * interbeam_f));
103 Beams should intersect one beamthickness below stem end
105 Real dy = Stem::stem_end_position (stem ) * ss / 2;
106 dy -= mol.extent (Y_AXIS).length () / 2 * Stem::get_direction (stem );
109 uhg. Should use relative coords and placement
111 Real whole_note_correction;
112 if (Stem::invisible_b (stem ))
113 whole_note_correction = -Stem::get_direction (stem )
114 * Stem::support_head (stem )->extent (X_AXIS).length () / 2;
116 whole_note_correction = 0;
118 mol.translate (Offset (stem->relative_coordinate (0, X_AXIS) - me->relative_coordinate (0, X_AXIS) +
119 whole_note_correction, dy));
122 return mol.create_scheme();
127 Stem_tremolo::set_stem (Score_element*me,Score_element *s)
129 me->set_elt_property ("stem", s->self_scm ());