2 stem-tremolo.cc -- implement Stem_tremolo
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "stem-tremolo.hh"
13 #include "directional-element-interface.hh"
16 #include "output-def.hh"
17 #include "staff-symbol-referencer.hh"
21 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_slope, 1)
23 Stem_tremolo::calc_slope (SCM smob)
25 Grob *me = unsmob_grob (smob);
26 Grob *stem = unsmob_grob (me->get_object ("stem"));
27 Spanner *beam = Stem::get_beam (stem);
32 SCM s = beam->get_property ("quantized-positions");
33 if (is_number_pair (s))
34 dy = - scm_to_double (scm_car (s)) + scm_to_double (scm_cdr (s));
36 Grob *s2 = Beam::last_visible_stem (beam);
37 Grob *s1 = Beam::first_visible_stem (beam);
39 Grob *common = s1->common_refpoint (s2, X_AXIS);
40 Real dx = s2->relative_coordinate (common, X_AXIS) -
41 s1->relative_coordinate (common, X_AXIS);
43 return scm_from_double (dx ? dy / dx : 0);
46 /* down stems with flags should have more sloped trems (helps avoid
47 flag/stem collisions without making the stem very long) */
48 return scm_from_double (
49 (Stem::duration_log (stem) >= 3 && get_grob_direction (stem) == DOWN) ?
53 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_width, 1)
55 Stem_tremolo::calc_width (SCM smob)
57 Grob *me = unsmob_grob (smob);
58 Grob *stem = unsmob_grob (me->get_object ("stem"));
59 Direction stemdir = get_grob_direction (stem);
60 bool beam = Stem::get_beam (stem);
61 bool flag = Stem::duration_log (stem) >= 3 && !beam;
63 /* beamed stems and up-stems with flags have shorter tremolos */
64 return scm_from_double (((stemdir == UP && flag) || beam)? 1.0 : 1.5);
67 MAKE_SCHEME_CALLBACK (Stem_tremolo, calc_style, 1)
69 Stem_tremolo::calc_style (SCM smob)
71 Grob *me = unsmob_grob (smob);
72 Grob *stem = unsmob_grob (me->get_object ("stem"));
73 Direction stemdir = get_grob_direction (stem);
74 bool beam = Stem::get_beam (stem);
75 bool flag = Stem::duration_log (stem) >= 3 && !beam;
77 return ly_symbol2scm (((stemdir == UP && flag) || beam) ? "rectangle" : "default");
81 Stem_tremolo::get_beam_translation (Grob *me)
83 Grob *stem = unsmob_grob (me->get_object ("stem"));
84 Spanner *beam = Stem::get_beam (stem);
86 return (beam && beam->is_live ())
87 ? Beam::get_beam_translation (beam) : 0.81;
91 Stem_tremolo::raw_stencil (Grob *me, Real slope, Direction stemdir)
93 Real ss = Staff_symbol_referencer::staff_space (me);
94 Real thick = robust_scm2double (me->get_property ("beam-thickness"), 1);
95 Real width = robust_scm2double (me->get_property ("beam-width"), 1);
96 Real blot = me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter"));
97 SCM style = me->get_property ("style");
98 if (!scm_is_symbol (style))
99 style = ly_symbol2scm ("default");
105 if (style == ly_symbol2scm ("rectangle"))
106 a = Lookup::rotated_box (slope, width, thick, blot);
108 a = Lookup::beam (slope, width, thick, blot);
110 a.align_to (X_AXIS, CENTER);
111 a.align_to (Y_AXIS, CENTER);
113 int tremolo_flags = robust_scm2int (me->get_property ("flag-count"), 0);
116 programming_error ("no tremolo flags");
122 Real beam_translation = get_beam_translation (me);
125 for (int i = 0; i < tremolo_flags; i++)
128 b.translate_axis (beam_translation * i * stemdir * -1, Y_AXIS);
136 MAKE_SCHEME_CALLBACK (Stem_tremolo, height, 1);
138 Stem_tremolo::height (SCM smob)
140 Grob *me = unsmob_grob (smob);
143 Cannot use the real slope, since it looks at the Beam.
145 Stencil s1 (translated_stencil (me, 0.35));
147 return ly_interval2scm (s1.extent (Y_AXIS));
151 Stem_tremolo::translated_stencil (Grob *me, Real slope)
153 Grob *stem = unsmob_grob (me->get_object ("stem"));
156 programming_error ("no stem for stem-tremolo");
160 Spanner *beam = Stem::get_beam (stem);
161 Direction stemdir = get_grob_direction (stem);
165 bool whole_note = Stem::duration_log (stem) <= 0;
167 Real beam_translation = get_beam_translation (me);
169 /* for a whole note, we position relative to the notehead, so we want the
170 stencil aligned on the flag closest to the head */
171 Direction stencil_dir = whole_note ? -stemdir : stemdir;
172 Stencil mol = raw_stencil (me, slope, stencil_dir);
174 Interval mol_ext = mol.extent (Y_AXIS);
175 Real ss = Staff_symbol_referencer::staff_space (me);
177 // ugh, rather calc from Stem_tremolo_req
178 int beam_count = beam ? (Stem::beam_multiplicity (stem).length () + 1) : 0;
180 Real beamthickness = 0.0;
181 SCM sbt = (beam) ? beam->get_property ("thickness") : SCM_EOL;
182 if (scm_is_number (sbt))
183 beamthickness = scm_to_double (sbt) * ss;
186 = Stem::stem_end_position (stem) * ss / 2
187 - stemdir * max (beam_count, 1) * beam_translation;
189 if (!beam && Stem::duration_log (stem) >= 3)
191 end_y -= stemdir * (Stem::duration_log (stem) - 2) * beam_translation;
193 end_y -= stemdir * beam_translation * 0.5;
197 /* we shouldn't position relative to the end of the stem since the stem
199 vector<int> nhp = Stem::note_head_positions (stem);
200 Real note_head = (stemdir == UP ? nhp.back () : nhp[0]) * ss / 2;
201 end_y = note_head + stemdir * 1.5;
203 mol.translate_axis (end_y, Y_AXIS);
208 MAKE_SCHEME_CALLBACK (Stem_tremolo, print, 1);
210 Stem_tremolo::print (SCM grob)
212 Grob *me = unsmob_grob (grob);
214 Stencil s = translated_stencil (me, robust_scm2double (me->get_property ("slope"), 0.25));
215 return s.smobbed_copy ();
218 ADD_INTERFACE (Stem_tremolo, "stem-tremolo-interface",
219 "A beam slashing a stem to indicate a tremolo.",