- {
- /*
- event_dir == LEFT: left edge of a beamsegment.
- */
- Direction event_dir = LEFT;
- do
- {
- bool on_bound = (event_dir == LEFT) ? j == 0 :
- j == segs.size() - 1;
-
- bool inside_stem = (event_dir == LEFT)
- ? segs[j].stem_index_ > 0
- : segs[j].stem_index_ < stems.size () - 1;
-
- bool event = on_bound
- || abs (segs[j].rank_ - segs[j+event_dir].rank_) > 1
- || (abs (vertical_count) >= segs[j].max_connect_
- || abs (vertical_count) >= segs[j + event_dir].max_connect_);
-
- if (!event)
- continue;
-
- current.vertical_count_ = vertical_count;
- current.horizontal_[event_dir] = segs[j].stem_x_;
- if (segs[j].dir_ == event_dir)
- {
- if (on_bound
- && me->get_bound (event_dir)->break_status_dir ())
- {
- current.horizontal_[event_dir]
- = (me->get_bound (event_dir)->extent (commonx, X_AXIS)[RIGHT]
- + event_dir * break_overshoot[event_dir]);
- }
- else
- {
- Real notehead_width =
- Stem::duration_log (segs[j].stem_) == 1
- ? 1.98
- : 1.32; // URG.
-
-
- if (inside_stem)
- {
- Grob *neighbor_stem = stems[segs[j].stem_index_ + event_dir];
- Real neighbor_stem_x = neighbor_stem->relative_coordinate (commonx, X_AXIS);
-
- notehead_width = min (notehead_width,
- fabs (neighbor_stem_x - segs[j].stem_x_)/2);
- }
- current.horizontal_[event_dir] += event_dir * notehead_width;
- }
- }
- else
- {
- current.horizontal_[event_dir] += event_dir * segs[j].width_/2;
- if (segs[j].gapped_)
- current.horizontal_[event_dir] -= event_dir * gap_length;
- }
-
- if (event_dir == RIGHT)
- {
- segments.push_back (current);
- current = Beam_segment();
- }
- }
- while (flip (&event_dir) != LEFT);
- }
-
+ {
+ // Keeping track of the different directions here is a little tricky.
+ // segs[j].dir_ is the direction of the beam segment relative to the stem
+ // (ie. segs[j].dir_ == LEFT if the beam segment sticks out to the left of
+ // its stem) whereas event_dir refers to the edge of the beam segment that
+ // we are currently looking at (ie. if segs[j].dir_ == event_dir then we
+ // are looking at that edge of the beam segment that is furthest from its
+ // stem).
+ Beam_stem_segment const &seg = segs[j];
+ for (LEFT_and_RIGHT (event_dir))
+ {
+ Beam_stem_segment const &neighbor_seg = segs[j + event_dir];
+ // TODO: make names clearer? --jneem
+ // on_line_bound: whether the current segment is on the boundary of the WHOLE beam
+ // on_beam_bound: whether the current segment is on the boundary of just that part
+ // of the beam with the current beam_rank
+ bool on_line_bound = (seg.dir_ == LEFT) ? seg.stem_index_ == 0
+ : seg.stem_index_ == stems.size () - 1;
+ bool on_beam_bound = (event_dir == LEFT) ? j == 0
+ : j == segs.size () - 1;
+ bool inside_stem = (event_dir == LEFT)
+ ? seg.stem_index_ > 0
+ : seg.stem_index_ + 1 < stems.size ();
+
+ bool event = on_beam_bound
+ || abs (seg.rank_ - neighbor_seg.rank_) > 1
+ || (abs (vertical_count) >= seg.max_connect_
+ || abs (vertical_count) >= neighbor_seg.max_connect_);
+
+ if (!event)
+ // Then this edge of the current segment is irrelevant because it will
+ // be connected with the next segment in the event_dir direction.
+ // If we skip the left edge here, the right edge of
+ // the previous segment has already been skipped since
+ // the conditions are symmetric
+ continue;
+
+ current.vertical_count_ = vertical_count;
+ current.horizontal_[event_dir] = seg.stem_x_;
+ if (seg.dir_ == event_dir)
+ // then we are examining the edge of a beam segment that is furthest
+ // from its stem.
+ {
+ if (on_line_bound
+ && me->get_bound (event_dir)->break_status_dir ())
+ {
+ current.horizontal_[event_dir]
+ = (Axis_group_interface::generic_bound_extent (me->get_bound (event_dir),
+ commonx, X_AXIS)[RIGHT]
+ + event_dir * break_overshoot[event_dir]);
+ }
+ else
+ {
+ Grob *stem = stems[seg.stem_index_];
+ Drul_array<Real> beamlet_length
+ = robust_scm2interval (stem->get_property ("beamlet-default-length"), Interval (1.1, 1.1));
+ Drul_array<Real> max_proportion
+ = robust_scm2interval (stem->get_property ("beamlet-max-length-proportion"), Interval (0.75, 0.75));
+ Real length = beamlet_length[seg.dir_];
+
+ if (inside_stem)
+ {
+ Grob *neighbor_stem = stems[seg.stem_index_ + event_dir];
+ Real neighbor_stem_x = neighbor_stem->relative_coordinate (commonx, X_AXIS);
+
+ length = min (length,
+ fabs (neighbor_stem_x - seg.stem_x_) * max_proportion[seg.dir_]);
+ }
+ current.horizontal_[event_dir] += event_dir * length;
+ }
+ }
+ else
+ // we are examining the edge of a beam segment that is closest
+ // (ie. touching, unless there is a gap) its stem.
+ {
+ current.horizontal_[event_dir] += event_dir * seg.width_ / 2;
+ if (seg.gapped_)
+ {
+ current.horizontal_[event_dir] -= event_dir * gap_length;
+
+ if (Stem::is_invisible (seg.stem_))
+ {
+ /*
+ Need to do this in case of whole notes. We don't want the
+ heads to collide with the beams.
+ */
+ extract_grob_set (seg.stem_, "note-heads", heads);
+
+ for (vsize k = 0; k < heads.size (); k++)
+ current.horizontal_[event_dir]
+ = event_dir * min (event_dir * current.horizontal_[event_dir],
+ - gap_length / 2
+ + event_dir
+ * heads[k]->extent (commonx,
+ X_AXIS)[-event_dir]);
+ }
+ }
+ }
+
+ if (event_dir == RIGHT)
+ {
+ segments.push_back (current);
+ current = Beam_segment ();
+ }
+ }
+ }
+