2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "stem-tremolo.hh"
24 #include "directional-element-interface.hh"
27 #include "output-def.hh"
28 #include "staff-symbol-referencer.hh"
32 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_slope, 1)
34 Stem_tremolo::calc_slope (SCM smob)
36 Grob *me = unsmob_grob (smob);
37 Grob *stem = unsmob_grob (me->get_object ("stem"));
38 Spanner *beam = Stem::get_beam (stem);
43 SCM s = beam->get_property ("quantized-positions");
44 if (is_number_pair (s))
45 dy = - scm_to_double (scm_car (s)) + scm_to_double (scm_cdr (s));
47 Grob *s2 = Beam::last_normal_stem (beam);
48 Grob *s1 = Beam::first_normal_stem (beam);
50 Grob *common = s1->common_refpoint (s2, X_AXIS);
51 Real dx = s2->relative_coordinate (common, X_AXIS) -
52 s1->relative_coordinate (common, X_AXIS);
54 return scm_from_double (dx ? dy / dx : 0);
57 /* down stems with flags should have more sloped trems (helps avoid
58 flag/stem collisions without making the stem very long) */
59 return scm_from_double (
60 (Stem::duration_log (stem) >= 3 && get_grob_direction (stem) == DOWN) ?
64 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_width, 1)
66 Stem_tremolo::calc_width (SCM smob)
68 Grob *me = unsmob_grob (smob);
69 Grob *stem = unsmob_grob (me->get_object ("stem"));
70 Direction stemdir = get_grob_direction (stem);
71 bool beam = Stem::get_beam (stem);
72 bool flag = Stem::duration_log (stem) >= 3 && !beam;
74 /* beamed stems and up-stems with flags have shorter tremolos */
75 return scm_from_double (((stemdir == UP && flag) || beam)? 1.0 : 1.5);
78 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_style, 1)
80 Stem_tremolo::calc_style (SCM smob)
82 Grob *me = unsmob_grob (smob);
83 Grob *stem = unsmob_grob (me->get_object ("stem"));
84 Direction stemdir = get_grob_direction (stem);
85 bool beam = Stem::get_beam (stem);
86 bool flag = Stem::duration_log (stem) >= 3 && !beam;
88 return ly_symbol2scm (((stemdir == UP && flag) || beam) ? "rectangle" : "default");
92 Stem_tremolo::get_beam_translation (Grob *me)
94 Grob *stem = unsmob_grob (me->get_object ("stem"));
95 Spanner *beam = Stem::get_beam (stem);
97 return (beam && beam->is_live ())
98 ? Beam::get_beam_translation (beam)
99 : (Staff_symbol_referencer::staff_space (me)
100 * robust_scm2double (me->get_property ("length-fraction"), 1.0) * 0.81);
104 Stem_tremolo::raw_stencil (Grob *me, Real slope, Direction stemdir)
106 Real ss = Staff_symbol_referencer::staff_space (me);
107 Real thick = robust_scm2double (me->get_property ("beam-thickness"), 1);
108 Real width = robust_scm2double (me->get_property ("beam-width"), 1);
109 Real blot = me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
110 SCM style = me->get_property ("style");
111 if (!scm_is_symbol (style))
112 style = ly_symbol2scm ("default");
118 if (style == ly_symbol2scm ("rectangle"))
119 a = Lookup::rotated_box (slope, width, thick, blot);
121 a = Lookup::beam (slope, width, thick, blot);
123 a.align_to (X_AXIS, CENTER);
124 a.align_to (Y_AXIS, CENTER);
126 int tremolo_flags = robust_scm2int (me->get_property ("flag-count"), 0);
129 programming_error ("no tremolo flags");
135 Real beam_translation = get_beam_translation (me);
138 for (int i = 0; i < tremolo_flags; i++)
141 b.translate_axis (beam_translation * i * stemdir * -1, Y_AXIS);
149 MAKE_SCHEME_CALLBACK (Stem_tremolo, height, 1);
151 Stem_tremolo::height (SCM smob)
153 Grob *me = unsmob_grob (smob);
156 Cannot use the real slope, since it looks at the Beam.
158 Stencil s1 (translated_stencil (me, 0.35));
160 return ly_interval2scm (s1.extent (Y_AXIS));
163 MAKE_SCHEME_CALLBACK (Stem_tremolo, width, 1);
165 Stem_tremolo::width (SCM smob)
167 Grob *me = unsmob_grob (smob);
170 Cannot use the real slope, since it looks at the Beam.
172 Stencil s1 (untranslated_stencil (me, 0.35));
174 return ly_interval2scm (s1.extent (X_AXIS));
178 Stem_tremolo::vertical_length (Grob *me)
180 return untranslated_stencil (me, 0.35).extent (Y_AXIS).length ();
184 Stem_tremolo::untranslated_stencil (Grob *me, Real slope)
186 Grob *stem = unsmob_grob (me->get_object ("stem"));
189 programming_error ("no stem for stem-tremolo");
193 Direction stemdir = get_grob_direction (stem);
197 bool whole_note = Stem::duration_log (stem) <= 0;
199 /* for a whole note, we position relative to the notehead, so we want the
200 stencil aligned on the flag closest to the head */
201 Direction stencil_dir = whole_note ? -stemdir : stemdir;
202 return raw_stencil (me, slope, stencil_dir);
207 Stem_tremolo::translated_stencil (Grob *me, Real slope)
209 Stencil mol = untranslated_stencil (me, slope);
211 Grob *stem = unsmob_grob (me->get_object ("stem"));
215 Direction stemdir = get_grob_direction (stem);
219 Spanner *beam = Stem::get_beam (stem);
220 Real beam_translation = get_beam_translation (me);
222 int beam_count = beam ? (Stem::beam_multiplicity (stem).length () + 1) : 0;
223 Real ss = Staff_symbol_referencer::staff_space (me);
226 = Stem::stem_end_position (stem) * ss / 2
227 - stemdir * max (beam_count, 1) * beam_translation;
229 if (!beam && Stem::duration_log (stem) >= 3)
231 end_y -= stemdir * (Stem::duration_log (stem) - 2) * beam_translation;
233 end_y -= stemdir * beam_translation * 0.5;
236 bool whole_note = Stem::duration_log (stem) <= 0;
239 /* we shouldn't position relative to the end of the stem since the stem
241 vector<int> nhp = Stem::note_head_positions (stem);
242 Real note_head = (stemdir == UP ? nhp.back () : nhp[0]) * ss / 2;
243 end_y = note_head + stemdir * 1.5;
245 mol.translate_axis (end_y, Y_AXIS);
250 MAKE_SCHEME_CALLBACK (Stem_tremolo, print, 1);
252 Stem_tremolo::print (SCM grob)
254 Grob *me = unsmob_grob (grob);
256 Stencil s = translated_stencil (me, robust_scm2double (me->get_property ("slope"), 0.25));
257 return s.smobbed_copy ();
260 ADD_INTERFACE (Stem_tremolo,
261 "A beam slashing a stem to indicate a tremolo. The property"
262 " @code{style} can be @code{default} or @code{rectangle}.",