2 tie.cc -- implement Tie
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
15 #include "output-def.hh"
16 #include "rhythmic-head.hh"
18 #include "paper-column.hh"
20 #include "staff-symbol-referencer.hh"
21 #include "directional-element-interface.hh"
24 #include "note-head.hh"
25 #include "tie-column.hh"
28 tie: Connect two noteheads.
32 c4 ~ \clef bass ; c4 or
36 do we have non-horizontal ties then?
40 Tie::set_head (Grob *me, Direction d, Grob *h)
42 assert (!head (me, d));
43 index_set_cell (me->get_property ("head-pair"), d, h->self_scm ());
45 dynamic_cast<Spanner *> (me)->set_bound (d, h);
46 me->add_dependency (h);
50 Tie::set_interface (Grob *me)
52 me->set_property ("head-pair", scm_cons (SCM_EOL, SCM_EOL));
56 Tie::head (Grob *me, Direction d)
58 SCM c = me->get_property ("head-pair");
61 return unsmob_grob (index_get_cell (c, d));
67 Tie::get_column_rank (Grob *me, Direction d)
69 Spanner *span = dynamic_cast<Spanner *> (me);
70 Grob *h = head (me, d);
72 h = span->get_bound (d);
74 Grob *col = dynamic_cast<Item *> (h)->get_column ();
75 return Paper_column::get_rank (col);
79 Tie::get_position (Grob *me)
81 Direction d = head (me, LEFT) ? LEFT : RIGHT;
82 return Staff_symbol_referencer::get_position (head (me, d));
86 Default: Put the tie oppositie of the stem [Wanske p231]
88 In case of chords: Tie_column takes over
90 The direction of the Tie is more complicated (See [Ross] p136 and
93 (what about linebreaks? )
96 Tie::get_default_dir (Grob *me)
98 Item *sl = head (me, LEFT) ? Rhythmic_head::get_stem (head (me, LEFT)) : 0;
99 Item *sr = head (me, RIGHT) ? Rhythmic_head::get_stem (head (me, RIGHT)) : 0;
102 if (get_grob_direction (sl) == UP
103 && get_grob_direction (sr) == UP)
108 Item *s = sl ? sl : sr;
109 return -get_grob_direction (s);
116 Tie::set_direction (Grob *me)
118 if (!get_grob_direction (me))
120 if (Tie_column::has_interface (me->get_parent (Y_AXIS)))
121 Tie_column::set_directions (me->get_parent (Y_AXIS));
123 set_grob_direction (me, Tie::get_default_dir (me));
129 Tie::get_control_points (SCM smob)
131 Spanner *me = unsmob_spanner (smob);
132 if (!head (me, LEFT) && !head (me, RIGHT))
134 programming_error ("tie without heads");
141 Direction dir = get_grob_direction (me);
143 Real staff_space = Staff_symbol_referencer::staff_space (me);
144 Real staff_position = Tie::get_position (me);
146 Grob *common[NO_AXES];
147 for (int a = X_AXIS; a < NO_AXES; a++)
150 common[ax] = me->get_bound (LEFT)->common_refpoint (me, ax);
151 common[ax] = me->get_bound (RIGHT)->common_refpoint (common[a], ax);
154 Drul_array<Real> attachments;
157 Real gap = robust_scm2double (me->get_property ("x-gap"), 0.2);
161 = robust_relative_extent (me->get_bound (d),
166 while (flip (&d) != LEFT);
168 SCM details = me->get_property ("details");
171 = scm_assq (ly_symbol2scm ("height-limit"), details);
173 Real h_inf = robust_scm2double (scm_cdr (limit), 0.75) * staff_space;
174 Real r_0 = robust_scm2double (scm_cdr (scm_assq (ly_symbol2scm ("ratio"), details)),
177 Bezier b = slur_shape (attachments[RIGHT] - attachments[LEFT],
181 Offset middle = b.curve_point (0.5);
182 Offset edge = b.curve_point (0.0);
184 staff_position = rint (staff_position);
186 Real dy = fabs (middle[Y_AXIS] - edge[Y_AXIS]);
187 bool in_space = !(Staff_symbol_referencer::on_staffline (me, (int) staff_position));
188 bool fits_in_space = (dy < 0.6 * staff_space);
193 Grob *left_dot = unsmob_grob (me->get_bound (LEFT)->get_object ("dot"));
194 if (left_dot && in_space && fits_in_space)
196 if (staff_position == Staff_symbol_referencer::get_position (left_dot))
198 staff_position += dir;
206 Grob *left_stem = unsmob_grob (me->get_bound (LEFT)->get_object ("stem"));
209 Stencil flag = Stem::get_translated_flag (left_stem);
210 Real y = staff_position * staff_space * 0.5;
211 if (flag.extent (Y_AXIS).contains (y))
213 staff_position += dir;
214 in_space = !in_space;
219 Putting larger in-space ties next to the notes forces
220 the edges to be opposite (Y-wise) to the tie direction.
222 if (staff_position == Tie::get_position (me)
224 && dy > 0.3 * staff_space)
226 staff_position += 2 * dir;
229 if (in_space != fits_in_space)
233 staff_position += dir;
238 staff_position += dir;
244 if (fabs (dy) < 0.4 * staff_space)
247 vertically center in space.
249 Offset middle = b.curve_point (0.5);
250 Offset edge = b.curve_point (0.0);
252 Real center = (edge[Y_AXIS] + middle[Y_AXIS])/2.0;
253 b.translate (Offset (0,
254 staff_position * staff_space * 0.5
259 b.translate (Offset (0,
260 (staff_position - dir) * staff_space * 0.5
261 + dir * 0.2 * staff_space));
266 Real rounding_dy = (1.5 * dir - middle[Y_AXIS]);
268 b.translate (Offset (0,
269 0.5 * staff_position * staff_space + rounding_dy));
272 b.translate (Offset (attachments[LEFT]
273 - me->relative_coordinate (common[X_AXIS], X_AXIS), 0));
275 SCM controls = SCM_EOL;
276 for (int i = 4; i--;)
277 controls = scm_cons (ly_offset2scm (b.control_[i]), controls);
283 MAKE_SCHEME_CALLBACK (Tie, print, 1);
285 Tie::print (SCM smob)
287 Grob *me = unsmob_grob (smob);
289 SCM cp = me->get_property ("control-points");
290 if (!scm_is_pair (cp)) // list is more accurate
292 cp = get_control_points (smob);
293 me->set_property ("control-points", cp);
296 if (!scm_is_pair (cp))
297 return Stencil ().smobbed_copy ();
299 Real staff_thick = Staff_symbol_referencer::line_thickness (me);
300 Real base_thick = robust_scm2double (me->get_property ("thickness"), 1);
301 Real thick = base_thick * staff_thick;
305 for (SCM s = cp; s != SCM_EOL; s = scm_cdr (s))
307 b.control_[i] = ly_scm2offset (scm_car (s));
313 SCM p = me->get_property ("dash-period");
314 SCM f = me->get_property ("dash-fraction");
315 if (scm_is_number (p) && scm_is_number (f))
316 a = Lookup::dashed_slur (b,
318 robust_scm2double (p, 1.0),
319 robust_scm2double (f, 0));
322 get_grob_direction (me) * staff_thick,
325 return a.smobbed_copy ();
330 "A tie connecting two noteheads.\n",
332 "y-offset dash-period dash-fraction "
333 "staffline-clearance control-points head-pair "
334 "details thickness x-gap direction minimum-length");