/*
-note-spacing.cc -- implement
+ note-spacing.cc -- implement Note_spacing
-source file of the GNU LilyPond music typesetter
+ source file of the GNU LilyPond music typesetter
-(c) 2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 2001--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
- */
+#include "paper-column.hh"
+#include "item.hh"
+#include "moment.hh"
#include "note-spacing.hh"
#include "grob.hh"
+#include "note-column.hh"
+#include "warn.hh"
+#include "stem.hh"
+#include "separation-item.hh"
+#include "staff-spacing.hh"
+#include "accidental-placement.hh"
+
+void
+Note_spacing::get_spacing (Grob *me, Item* right_col,
+ Real base_space, Real increment, Real *space, Real *fixed)
+{
+
+ Drul_array<SCM> props(me->get_grob_property ("left-items"),
+ me->get_grob_property ("right-items"));
+ Direction d = LEFT;
+ Direction col_dir = right_col->break_status_dir ();
+ Drul_array<Interval> extents;
+
+ Interval left_head_wid;
+ do
+ {
+ for (SCM s = props[d]; gh_pair_p (s); s = gh_cdr (s))
+ {
+ Item * it= dynamic_cast<Item*> (unsmob_grob (gh_car(s)));
+
+ if (d == RIGHT && it->break_status_dir () != col_dir)
+ {
+ it = it -> find_prebroken_piece (col_dir);
+
+ }
+ /*
+ some kind of mismatch, eg. a note column, that is behind a
+ linebreak.
+ */
+ if (!it)
+ continue;
+
+ Item *it_col = it->column_l ();
+ if (d == RIGHT && right_col != it_col)
+ continue;
+
+ if (Separation_item::has_interface (it))
+ {
+ extents[d].unite (Separation_item::width (it));
+ continue;
+ }
+
+ if (d == LEFT)
+ {
+ SCM r = it->get_grob_property ("rest");
+ Grob * g = unsmob_grob (r);
+ if (!g)
+ g = Note_column::first_head (it);
+
+ if (g)
+ left_head_wid = g->extent(it_col, X_AXIS);
+ }
+
+ extents[d].unite (it->extent (it_col, X_AXIS));
+ if (d == RIGHT)
+ {
+ Grob * accs = Note_column::accidentals (it);
+ if (!accs)
+ accs = Note_column::accidentals (it->get_parent (X_AXIS));
+
+ if (accs)
+ {
+ Interval v =
+ Accidental_placement::get_relevant_accidental_extent (accs, it_col, me);
+
+ extents[d].unite (v);
+ }
+ }
+ }
+
+ if (extents[d].empty_b ())
+ extents[d] = Interval (0,0);
+ }
+ while (flip (&d) != LEFT);
+
+
+ /*
+ We look at the width of the note head, since smaller heads get less space
+ eg. a quarter rest gets almost 0.5 ss less horizontal space than a note.
+
+ What is sticking out of the note head (eg. a flag), doesn't get
+ the full amount of space.
+ */
+ *fixed = left_head_wid.empty_b () ? increment : left_head_wid[RIGHT];
+ *space = (base_space - increment) + *fixed +
+ (extents[LEFT][RIGHT] - left_head_wid[RIGHT])/ 2;
+ ;
+
+ if (*space - *fixed < 2 * ((- extents[RIGHT][LEFT]) >? 0))
+ {
+ /*
+
+ What's sticking out at the left of the right side has less
+ influence. We only take it into account if there is not enough
+ space.
+
+ this sucks: this criterion is discontinuous; FIXME.
+ */
+ *space += 0.5 * (( -extents[RIGHT][LEFT]) >? 0);
+ }
+
+ stem_dir_correction (me, right_col, increment, space, fixed);
+}
+
+Item *
+Note_spacing::left_column (Grob *me)
+{
+ if (!me->live())
+ return 0;
+
+ return dynamic_cast<Item*> (me)->column_l ();
+}
+
+/*
+ Compute the column of the right-items. This is a big function,
+since RIGHT-ITEMS may span more columns (eg. if a clef if inserted,
+this will add a new columns to RIGHT-ITEMS. Here we look at the
+columns, and return the left-most. If there are multiple columns, we
+prune RIGHT-ITEMS.
+
+ */
+Item *
+Note_spacing::right_column (Grob*me)
+{
+ if (!me->live())
+ return 0;
+
+ SCM right = me->get_grob_property ("right-items");
+ Item *mincol = 0;
+ int min_rank = INT_MAX;
+ bool prune = false;
+ for (SCM s = right ; gh_pair_p (s) ; s = gh_cdr (s))
+ {
+ Item * ri = unsmob_item (gh_car (s));
+
+ Item * col = ri->column_l ();
+ int rank = Paper_column::rank_i (col);
+
+ if (rank < min_rank)
+ {
+ min_rank = rank;
+ if (mincol)
+ prune = true;
+
+ mincol = col;
+ }
+ }
+
+ if (prune)
+ {
+ // I'm a lazy bum. We could do this in-place.
+ SCM newright = SCM_EOL;
+ for (SCM s = right ; gh_pair_p (s) ; s =gh_cdr (s))
+ {
+ if (unsmob_item (gh_car (s))->column_l () == mincol)
+ newright = gh_cons (gh_car (s), newright);
+ }
+
+ me->set_grob_property ("right-items", newright);
+ }
+
+ if (!mincol)
+ {
+ /*
+ int r = Paper_column::rank_i (dynamic_cast<Item*>(me)->column_l ());
+ programming_error (_f("Spacing wish column %d has no right item.", r));
+ */
+
+ return 0;
+ }
+
+ return mincol;
+}
-bool
-Note_spacing::has_interface (Grob* g)
+/**
+ Correct for optical illusions. See [Wanske] p. 138. The combination
+ up-stem + down-stem should get extra space, the combination
+ down-stem + up-stem less.
+
+ TODO: have to check wether the stems are in the same staff.
+
+*/
+void
+Note_spacing::stem_dir_correction (Grob*me, Item * rcolumn,
+ Real increment,
+ Real * space, Real *fixed)
{
- return g && g->has_interface (ly_symbol2scm ("note-spacing-interface"));
+ Drul_array<Direction> stem_dirs(CENTER,CENTER);
+ Drul_array<Interval> stem_posns;
+ Drul_array<Interval> head_posns;
+ Drul_array<SCM> props(me->get_grob_property ("left-items"),
+ me->get_grob_property ("right-items"));
+
+ Drul_array<Grob*> beams_drul(0,0);
+ Real correction = 0.0;
+
+ stem_dirs[LEFT] = stem_dirs[RIGHT] = CENTER;
+ Interval intersect;
+ Interval bar_xextent;
+ Interval bar_yextent;
+
+ bool correct = true;
+ Direction d = LEFT;
+ bool acc_right = false;
+
+ do
+ {
+ for (SCM s = props[d]; gh_pair_p (s); s = gh_cdr (s))
+ {
+ Item * it= dynamic_cast<Item*> (unsmob_grob (gh_car(s)));
+
+ if (d == RIGHT)
+ acc_right = acc_right || Note_column::accidentals (it);
+
+ Grob *stem = Note_column::stem_l (it);
+
+ if (!stem)
+ {
+ if (d == RIGHT && Separation_item::has_interface (it))
+ {
+ if (it->column_l () != rcolumn)
+ {
+ it = it->find_prebroken_piece (rcolumn->break_status_dir ());
+ }
+
+ Grob *last = Staff_spacing::extremal_break_aligned_grob (it, LEFT, &bar_xextent);
+
+ if (last)
+ bar_yextent = Staff_spacing::bar_y_positions (last);
+
+ break;
+ }
+
+ return ;
+ }
+
+ if(Stem::invisible_b (stem))
+ {
+ return ;
+ }
+
+ beams_drul[d] = Stem::beam_l (stem);
+
+
+ Direction sd = Stem::get_direction (stem);
+ if (stem_dirs[d] && stem_dirs[d] != sd)
+ {
+ return ;
+ }
+ stem_dirs[d] = sd;
+
+ /*
+ Correction doesn't seem appropriate when there is a large flag
+ hanging from the note.
+ */
+ if (d == LEFT
+ && Stem::duration_log (stem) > 2 && !Stem::beam_l (stem))
+ {
+
+ return;
+ }
+
+
+
+ Interval hp = Stem::head_positions (stem);
+ Real chord_start = hp[sd];
+ Real stem_end = Stem::stem_end_position (stem);
+
+ stem_posns[d] = Interval(chord_start<?stem_end, chord_start>? stem_end);
+ head_posns[d].unite (hp);
+ }
+ }
+ while (flip (&d) != LEFT);
+
+
+ /*
+ don't correct if accidentals are sticking out of the right side.
+
+ */
+ if (acc_right)
+ return ;
+
+ if (!bar_yextent.empty_b())
+ {
+ stem_dirs[RIGHT] = - stem_dirs[LEFT];
+ stem_posns[RIGHT] = bar_yextent;
+ }
+
+ if (correct &&stem_dirs[LEFT] *stem_dirs[RIGHT] == -1)
+ {
+ if (beams_drul[LEFT] && beams_drul[LEFT] == beams_drul[RIGHT])
+ {
+ /*
+ this is a knee: maximal correction.
+ */
+
+ correction = increment* stem_dirs[LEFT];
+ *fixed += increment* stem_dirs[LEFT];
+ }
+ else
+ {
+ intersect = stem_posns[LEFT];
+ intersect.intersect(stem_posns[RIGHT]);
+ correct = correct && !intersect.empty_b ();
+
+ if (!correct)
+ return;
+
+ correction = abs (intersect.length ());
+
+
+ /*
+ Ugh. 7 is hardcoded.
+ */
+ correction = (correction/7) <? 1.0;
+ correction *= stem_dirs[LEFT] ;
+ correction *= gh_scm2double (me->get_grob_property ("stem-spacing-correction"));
+
+ if (!bar_yextent.empty_b())
+ {
+ correction *= 0.5;
+ }
+ }
+ }
+ else if (correct && stem_dirs[LEFT] *stem_dirs[RIGHT] == UP)
+ {
+ /*
+ Correct for the following situation:
+
+ X X
+ | |
+ | |
+ | X |
+ | | |
+ ========
+
+ ^ move the center one to the left.
+
+
+ this effect seems to be much more subtle than the
+ stem-direction stuff (why?), and also does not scale with the
+ difference in stem length.
+
+ */
+
+
+ Interval hp = head_posns[LEFT];
+ hp.intersect (head_posns[RIGHT]);
+ if (!hp.empty_b())
+ return ;
+
+ Direction lowest =
+ (head_posns[LEFT][DOWN] > head_posns[RIGHT][UP]) ? RIGHT : LEFT;
+
+ Real delta = head_posns[-lowest][DOWN] - head_posns[lowest][UP] ;
+ Real corr = gh_scm2double (me->get_grob_property ("stem-spacing-correction"));
+ corr = (delta <= 1) ? 0.0 : 0.25;
+
+ correction= -lowest * corr ;
+ }
+
+ if (!bar_xextent.empty_b())
+ correction += - bar_xextent[LEFT];
+
+ *space += correction;
}
+
+
+
+
+ADD_INTERFACE (Note_spacing,"note-spacing-interface",
+ "",
+ "left-items right-items stem-spacing-correction");
+
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