2 slur-configuration.cc -- implement Slur_configuration
4 source file of the GNU LilyPond music typesetter
6 (c) 2004--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "slur-configuration.hh"
18 #include "pointer-group-interface.hh"
20 #include "slur-scoring.hh"
22 #include "staff-symbol-referencer.hh"
23 #include "libc-extension.hh"
26 avoid_staff_line (Slur_score_state const &state,
30 Array<Real> ts = bez.solve_derivative (horiz);
32 /* TODO: handle case of broken slur. */
34 && (state.extremes_[LEFT].staff_ == state.extremes_[RIGHT].staff_)
35 && state.extremes_[LEFT].staff_ && state.extremes_[RIGHT].staff_)
37 Real y = bez.curve_point (ts[0])[Y_AXIS];
39 Grob *staff = state.extremes_[LEFT].staff_;
41 Real p = 2 * (y - staff->relative_coordinate (state.common_[Y_AXIS], Y_AXIS))
44 Real distance = fabs (my_round (p) - p); // in halfspaces
45 if (distance < 4 * state.thickness_
46 && (int) fabs (my_round (p))
47 <= 2 * Staff_symbol_referencer::staff_radius (staff) + 0.1
48 && (int (fabs (my_round (p))) % 2
49 != Staff_symbol_referencer::line_count (staff) % 2))
51 Direction resolution_dir
52 = (distance ? state.dir_ : Direction (sign (p - my_round (p))));
55 Real newp = my_round (p) + resolution_dir
56 * 5 * state.thickness_;
58 Real dy = (newp - p) * state.staff_space_ / 2.0;
60 bez.control_[1][Y_AXIS] += dy;
61 bez.control_[2][Y_AXIS] += dy;
68 fit_factor (Offset dz_unit, Offset dz_perp,
69 Bezier curve, Direction d, Array<Offset> const &avoid)
71 Real fit_factor = 0.0;
72 Offset x0 = curve.control_[0];
73 curve.translate (-x0);
74 curve.rotate (-dz_unit.arg ());
78 curve_xext.add_point (curve.control_[0][X_AXIS]);
79 curve_xext.add_point (curve.control_[3][X_AXIS]);
81 for (int i = 0; i < avoid.size (); i++)
83 Offset z = (avoid[i] - x0);
84 Offset p (dot_product (z, dz_unit),
85 d * dot_product (z, dz_perp));
86 if (!curve_xext.contains (p[X_AXIS]))
89 Real y = curve.get_other_coordinate (X_AXIS, p[X_AXIS]);
91 fit_factor = max (fit_factor, (p[Y_AXIS] / y));
97 Slur_configuration::generate_curve (Slur_score_state const &state,
99 Array<Offset> const &avoid)
101 Offset dz = attachment_[RIGHT]- attachment_[LEFT];;
103 dz_unit *= 1 / dz.length ();
104 Offset dz_perp = dz_unit * Offset (0, 1);
107 get_slur_indent_height (&indent, &height, dz.length (), h_inf, r_0);
109 Real len = dz.length ();
113 len^2 > 4h^2 + 3 (i + 1/3len)^2 - 1/3 len^2
117 |bez' (0)| < | bez' (.5)|
119 when (control2 - control1) has the same direction as
120 (control3 - control0). */
122 Real max_indent = len / 3.1;
123 indent = min (indent, max_indent);
125 Real a1 = sqr (len) / 3.0;
126 Real a2 = 0.75 * sqr (indent + len / 3.0);
127 Real max_h = a1 - a2;
131 programming_error ("slur indent too small");
135 max_h = sqrt (max_h);
137 Real eccentricity = robust_scm2double (state.slur_->get_property ("eccentricity"), 0);
139 Real x1 = (eccentricity + indent);
140 Real x2 = (eccentricity - indent);
143 curve.control_[0] = attachment_[LEFT];
144 curve.control_[1] = attachment_[LEFT] + dz_perp * height * state.dir_
146 curve.control_[2] = attachment_[RIGHT] + dz_perp * height * state.dir_
148 curve.control_[3] = attachment_[RIGHT];
150 Real ff = fit_factor (dz_unit, dz_perp, curve, state.dir_, avoid);
152 height = max (height, min (height * ff, max_h));
154 curve.control_[0] = attachment_[LEFT];
155 curve.control_[1] = attachment_[LEFT] + dz_perp * height * state.dir_
157 curve.control_[2] = attachment_[RIGHT] + dz_perp * height * state.dir_
159 curve.control_[3] = attachment_[RIGHT];
161 curve_ = avoid_staff_line (state, curve);
165 Slur_configuration::Slur_configuration ()
172 Slur_configuration::score_encompass (Slur_score_state const &state)
174 Bezier const &bez (curve_);
178 Distances for heads that are between slur and line between
181 Array<Real> convex_head_distances;
182 for (int j = 0; j < state.encompass_infos_.size (); j++)
184 Real x = state.encompass_infos_[j].x_;
186 bool l_edge = j == 0;
187 bool r_edge = j == state.encompass_infos_.size () - 1;
188 bool edge = l_edge || r_edge;
190 if (! (x < attachment_[RIGHT][X_AXIS]
191 && x > attachment_[LEFT][X_AXIS]))
194 Real y = bez.get_other_coordinate (X_AXIS, x);
197 Real head_dy = (y - state.encompass_infos_[j].head_);
198 if (state.dir_ * head_dy < 0)
200 demerit += state.parameters_.head_encompass_penalty_;
201 convex_head_distances.push (0.0);
206 ? (1 / fabs (head_dy) - 1 / state.parameters_.free_head_distance_)
207 : state.parameters_.head_encompass_penalty_;
208 hd = min (max (hd, 0.0), state.parameters_.head_encompass_penalty_);
213 Real line_y = linear_interpolate (x,
214 attachment_[RIGHT][X_AXIS],
215 attachment_[LEFT][X_AXIS],
216 attachment_[RIGHT][Y_AXIS],
217 attachment_[LEFT][Y_AXIS]);
219 if (1) // state.dir_ * state.encompass_infos_[j].get_point (state.dir_) > state.dir_ *line_y )
223 = state.dir_ * max (state.dir_ * state.encompass_infos_[j].get_point (state.dir_), state.dir_ * line_y);
224 Real d = fabs (closest - y);
226 convex_head_distances.push (d);
230 if (state.dir_ * (y - state.encompass_infos_[j].stem_) < 0)
232 Real stem_dem = state.parameters_.stem_encompass_penalty_;
233 if ((l_edge && state.dir_ == UP)
234 || (r_edge && state.dir_ == DOWN))
242 ext.add_point (state.encompass_infos_[j].stem_);
243 ext.add_point (state.encompass_infos_[j].head_);
246 demerit += -state.parameters_.closeness_factor_
248 * (y - (ext[state.dir_] + state.dir_ * state.parameters_.free_head_distance_)), 0.0)
249 / state.encompass_infos_.size ();
253 Real variance_penalty = 0.0;
255 if (convex_head_distances.size ())
257 Real avg_distance = 0.0;
258 Real min_dist = infinity_f;
259 for (int j = 0; j < convex_head_distances.size (); j++)
261 min_dist = min (min_dist, convex_head_distances[j]);
262 avg_distance += convex_head_distances[j];
266 For slurs over 3 or 4 heads, the average distance is not a
269 Real n = convex_head_distances.size ();
273 avg_distance += height_ * fact;
278 TODO: maybe it's better to use (avgdist - mindist)*factor
282 variance_penalty = state.parameters_.head_slur_distance_max_ratio_;
285 = min ((avg_distance / (min_dist + state.parameters_.absolute_closeness_measure_) - 1.0), variance_penalty);
287 variance_penalty = max (variance_penalty, 0.0);
288 variance_penalty *= state.parameters_.head_slur_distance_factor_;
291 #if DEBUG_SLUR_SCORING
292 score_card_ += to_string ("C%.2f", demerit);
293 score_card_ += to_string ("D%.2f", variance_penalty);
296 score_ += demerit + variance_penalty;
300 Slur_configuration::score_extra_encompass (Slur_score_state const &state)
303 for (int j = 0; j < state.extra_encompass_infos_.size (); j++)
305 Drul_array<Offset> attachment = attachment_;
306 Interval slur_wid (attachment[LEFT][X_AXIS], attachment[RIGHT][X_AXIS]);
309 to prevent numerical inaccuracies in
310 Bezier::get_other_coordinate ().
319 We need to check for the bound explicitly, since the
320 slur-ending can be almost vertical, making the Y
321 coordinate a bad approximation of the object-slur
324 Item *as_item = dynamic_cast<Item *> (state.extra_encompass_infos_[j].grob_);
326 && as_item->get_column ()
327 == state.extremes_[d].bound_->get_column ())
328 || state.extra_encompass_infos_[j].extents_[X_AXIS].contains (attachment[d][X_AXIS]))
330 y = attachment[d][Y_AXIS];
334 while (flip (&d) != LEFT);
338 Real x = state.extra_encompass_infos_[j].extents_[X_AXIS]
339 .linear_combination (state.extra_encompass_infos_[j].idx_);
341 if (!slur_wid.contains (x))
344 y = curve_.get_other_coordinate (X_AXIS, x);
347 Real dist = state.extra_encompass_infos_[j].extents_[Y_AXIS].distance (y);
349 += fabs (max (0.0, (state.parameters_.extra_encompass_free_distance_ - dist)))
350 / state.parameters_.extra_encompass_free_distance_
351 * state.extra_encompass_infos_[j].penalty_;
353 #if DEBUG_SLUR_SCORING
354 score_card_ += to_string ("X%.2f", demerit);
360 Slur_configuration::score_edges (Slur_score_state const &state)
363 Offset dz = attachment_[RIGHT]
365 Real slope = dz[Y_AXIS] / dz[X_AXIS];
368 Real y = attachment_[d][Y_AXIS];
369 Real dy = fabs (y - state.base_attachments_[d][Y_AXIS]);
371 Real factor = state.parameters_.edge_attraction_factor_;
372 Real demerit = factor * dy;
373 if (state.extremes_[d].stem_
374 && state.extremes_[d].stem_dir_ == state.dir_
375 && !Stem::get_beaming (state.extremes_[d].stem_, -d))
378 demerit *= exp (state.dir_ * d * slope
379 * state.parameters_.edge_slope_exponent_);
382 #if DEBUG_SLUR_SCORING
383 score_card_ += to_string ("E%.2f", demerit);
386 while (flip (&d) != LEFT);
390 Slur_configuration ::score_slopes (Slur_score_state const &state)
392 Real dy = state.musical_dy_;
393 Offset slur_dz = attachment_[RIGHT] - attachment_[LEFT];
394 Real slur_dy = slur_dz[Y_AXIS];
397 demerit += max ((fabs (slur_dy / slur_dz[X_AXIS])
398 - state.parameters_.max_slope_), 0.0)
399 * state.parameters_.max_slope_factor_;
401 /* 0.2: account for staffline offset. */
402 Real max_dy = (fabs (dy) + 0.2);
403 if (state.edge_has_beams_)
406 if (!state.is_broken_)
407 demerit += state.parameters_.steeper_slope_factor_
408 * (max (fabs (slur_dy) -max_dy, 0.0));
410 demerit += max ((fabs (slur_dy / slur_dz[X_AXIS])
411 - state.parameters_.max_slope_), 0.0)
412 * state.parameters_.max_slope_factor_;
415 && sign (slur_dy) != 0
416 && !state.is_broken_)
417 demerit += state.parameters_.non_horizontal_penalty_;
422 && sign (slur_dy) != sign (dy))
423 demerit += state.edge_has_beams_
424 ? state.parameters_.same_slope_penalty_ / 10
425 : state.parameters_.same_slope_penalty_;
427 #if DEBUG_SLUR_SCORING
428 score_card_ += to_string ("S%.2f", demerit);
434 Slur_configuration::score (Slur_score_state const &state)
436 score_extra_encompass (state);
437 score_slopes (state);
439 score_encompass (state);