/*
+ slur.cc -- implement Slur
+ source file of the GNU LilyPond music typesetter
+
+ (c) 1996, 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+*/
+
+/*
TODO:
+
think about crossing stems.
+ Begin and end should be treated as a Script.
*/
#include "slur.hh"
#include "scalar.hh"
#include "lookup.hh"
#include "paper-def.hh"
-#include "notehead.hh"
+#include "note-column.hh"
+#include "stem.hh"
#include "p-col.hh"
#include "molecule.hh"
#include "debug.hh"
#include "boxes.hh"
+#include "bezier.hh"
+#include "main.hh"
+IMPLEMENT_IS_TYPE_B1(Slur,Spanner);
-
-Slur::Slur()
+void
+Slur::add (Note_column*n)
{
- open_right=open_left=false;
+ encompass_arr_.push (n);
+ add_dependency (n);
}
-Offset
-Slur::center() const
+void
+Slur::set_default_dir ()
{
- int pos1 = encompass.top()->position;
- int pos2 = encompass[0]->position;
-
- int dy = pos1-pos2;
-
- Real w = width().length();
+ dir_ = DOWN;
+ for (int i=0; i < encompass_arr_.size (); i ++)
+ {
+ if (encompass_arr_[i]->dir_ < 0)
+ {
+ dir_ = UP;
+ break;
+ }
+ }
+}
- return Offset(w/2,dy * paper()->internote());
+void
+Slur::do_add_processing ()
+{
+ set_bounds (LEFT, encompass_arr_[0]);
+ if (encompass_arr_.size () > 1)
+ set_bounds (RIGHT, encompass_arr_.top ());
}
void
-Slur::add(Notehead*n)
+Slur::do_pre_processing ()
{
- encompass.push(n);
- add_dependency(n);
+ // don't set directions
}
void
-Slur::set_default_dir()
+Slur::do_substitute_dependency (Score_elem*o, Score_elem*n)
{
- int sumpos=0;
- for (int i=0; i < encompass.size(); i ++) {
- sumpos += encompass[i]->position;
+ int i;
+ while ((i = encompass_arr_.find_i ((Note_column*)o->item ())) >=0)
+ {
+ if (n)
+ encompass_arr_[i] = (Note_column*)n->item ();
+ else
+ encompass_arr_.del (i);
}
+}
- /* should consult stems */
- Real meanpos = sumpos/Real(encompass.size());
- if (meanpos < 5) // todo
- dir_i_ = -1;
- else
- dir_i_ = 1;
+static int
+Note_column_compare (Note_column *const&n1 , Note_column* const&n2)
+{
+ return Item::left_right_compare (n1, n2);
}
void
-Slur::do_pre_processing()
+Slur::do_post_processing ()
{
- right = encompass.top()->pcol_l_;
- left = encompass[0]->pcol_l_;
+ encompass_arr_.sort (Note_column_compare);
+ if (!dir_)
+ set_default_dir ();
+ Real interline_f = paper ()->interline_f ();
+ Real inter_f = interline_f / 2;
+
+ /*
+ [OSU]: slur and tie placement
+
+ slurs:
+ * x = centre of head (upside-down: inner raakpunt stem) - d * gap
+
+ * y = length < 5ss : horizontal raakpunt + d * 0.25 ss
+ y = length >= 5ss : y next interline - d * 0.25 ss
+ --> height <= 5 length ?? we use <= 3 length, now...
+
+ * suggested gap = ss / 5;
+ */
+ // jcn: 1/5 seems so small?
+ Real gap_f = interline_f / 2; // 5;
+
+ Drul_array<Note_column*> extrema;
+ extrema[LEFT] = encompass_arr_[0];
+ extrema[RIGHT] = encompass_arr_.top ();
+
+ Direction d=LEFT;
+ Real nw_f = paper ()->note_width ();
+
+ do
+ {
+ if (extrema[d] != spanned_drul_[d])
+ {
+ dx_f_drul_[d] = -d
+ *(spanned_drul_[d]->width ().length () -0.5*nw_f);
+ }
+ else if (extrema[d]->stem_l_ && !extrema[d]->stem_l_->transparent_b_)
+ {
+ dy_f_drul_[d] = (int)rint (extrema[d]->stem_l_->height ()[dir_]);
+ /* normal slur from notehead centre to notehead centre, minus gap */
+ // ugh: diff between old and new slurs
+ if (!experimental_features_global_b)
+ dx_f_drul_[d] += -d * gap_f;
+ else
+ dx_f_drul_[d] += 0.5 * nw_f - d * gap_f;
+ }
+ else
+ {
+ dy_f_drul_[d] = (int)rint (extrema[d]->head_positions_interval ()[dir_])* inter_f;
+ }
+ dy_f_drul_[d] += dir_ * interline_f;
+ }
+ while (flip(&d) != LEFT);
}
-Spanner*
-Slur::do_break_at(PCol*l, PCol*r) const
+Real
+Slur::height_f () const
{
- assert(l->line_l_ == r->line_l_);
- Slur*ret = new Slur(*this);
+ Bezier_bow bow (paper ());
+ Array<Offset> notes = get_notes ();
+ bow.set (notes, dir_);
- ret->encompass.set_size(0);
- for (int i =0; i < encompass.size(); i++) {
- if (encompass[i]->pcol_l_->line_l_==l->line_l_)
- ret->encompass.push(encompass[i]);
- }
- if (right != r)
- ret->open_right = true;
- if (left != l)
- ret->open_left = true;
+ Real height = 0;
+ Real dy1 = bow.calc_f (height);
+ if (!dy1)
+ return height;
+ height = dy1;
+ bow.set (notes, dir_);
+ Real dy2 = bow.calc_f (height);
+ if (!dy2)
+ return height;
- return ret;
+ if (abs (dy2 - dy1) < paper ()->rule_thickness ())
+ return height;
+
+ /*
+ Assume
+ dy = B (h)
+ with
+ B (h) = a * h + b;
+
+ Then we get for height = h{dy=0}
+ */
+ Real a = (dy2 - dy1) / dy1;
+ Real b = dy1;
+ height = -b / a;
+
+ if (check_debug && !monitor->silent_b ("Slur"))
+ {
+ cout << "************" << endl;
+ cout << "dy1: " << dy1 << endl;
+ cout << "dy2: " << dy2 << endl;
+ cout << "a: " << a << endl;
+ cout << "b: " << b << endl;
+ cout << "h: " << height << endl;
+ }
+
+ return height;
}
-void
-Slur::do_post_processing()
+Molecule*
+Slur::brew_molecule_p () const
{
- if (!dir_i_)
- set_default_dir();
+ if (!experimental_features_global_b)
+ return Bow::brew_molecule_p ();
+
+ Molecule* mol_p = new Molecule;
+
+ Real dy_f = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
+
+ Real dx_f = width ().length ();
+ dx_f += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
+
+ Atom a = paper ()->lookup_l ()->control_slur (get_controls (), dx_f, dy_f);
+
+ Real interline_f = paper ()->interline_f ();
+ Real gap_f = interline_f / 2; // 5;
+ Real nw_f = paper ()->note_width ();
+ a.translate (Offset (dx_f + 0.5 * nw_f + gap_f, dy_f + dy_f_drul_[LEFT]));
+ mol_p->add (a);
+ return mol_p;
}
-Molecule*
-Slur::brew_molecule_p() const
+Array<Offset>
+Slur::get_notes () const
{
- Molecule*output = new Molecule;
+ Real interline = paper ()->interline_f ();
+ Real notewidth = paper ()->note_width ();
+ Real internote = interline / 2;
+
+ Stem* left_stem = encompass_arr_[0]->stem_l_;
+ Real left_x = left_stem->hpos_f ();
+ // ugh, do bow corrections (see brew_mol)
+ left_x += dx_f_drul_[LEFT] + 0.5 * notewidth;
+
+ // ugh, do bow corrections (see brew_mol)
+ Real left_y = dy_f_drul_[LEFT];
+ // ugh, where does this asymmetry come from?
+ if (dir_ == DOWN)
+ left_y -= dir_ * internote;
- int minp=1000, maxp=-1000; // todo
- for (int i=0; i<encompass.size(); i++) {
- minp = encompass[i]->position <? minp;
- maxp = encompass[i]->position >? maxp;
+ /*
+ urg, corrections for broken slurs: extra begin or end position
+ */
+ int first = 0;
+ int n = encompass_arr_.size ();
+ if (encompass_arr_[0] != spanned_drul_[LEFT])
+ {
+ n += 1;
+ first = 1;
+ left_x = spanned_drul_[LEFT]->width ().length ();
+ left_y = 0;
}
- assert(encompass.size()>0); // todo
-
- Notehead *lnote_p =encompass[0];
- Notehead *rnote_p =encompass.top();
- int lpos_i = lnote_p->position;
- int rpos_i = rnote_p->position;
- Offset left_off(lnote_p->x_dir, lpos_i + 2*dir_i_);
- Offset right_off(lnote_p->x_dir, rpos_i + 2*dir_i_);
- if (!lnote_p->extremal)
- left_off += Offset(0.5, -dir_i_);
- if (!rnote_p->extremal)
- right_off+= Offset(-0.5, -dir_i_);
-
- int dy = int(right_off.y - left_off.y);
-
- Real nw_f = paper()->note_width();
- Real nh_f = paper()->internote();
- Real w = width().length();
-
- w+= (right_off.x - left_off.x) * nw_f ;
- Real round_w = w; // slur lookup rounds the slurwidth .
-
- Symbol sl = paper()->lookup_l()->slur(dy , round_w, dir_i_);
+ if (encompass_arr_.top () != spanned_drul_[RIGHT])
+ n += 1;
- Real error = w-round_w;
+ Array<Offset> notes;
+ notes.set_size (n);
+
+ Real dx = width ().length ();
+ dx += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
+ dx = dx <? 1000;
+ dx = dx >? 2 * interline;
- Atom a(sl);
- a.translate(Offset((left_off.x + 0.5 )*nw_f + error/2,
- left_off.y * nh_f));
- output->add(a);
- return output;
+ Real dy = (dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
+ if (abs (dy) > 1000)
+ dy = sign (dy) * 1000;
+
+ notes[0].x () = 0;
+ notes[0].y () = 0;
+ notes[n - 1].x () = dx;
+ notes[n - 1].y () = dy;
+ for (int i = 1; i < n - 1; i++)
+ {
+ Stem* stem = encompass_arr_[i - first]->stem_l_;
+ /*
+ set x to middle of notehead or on exact x position of stem,
+ according to slur direction
+ */
+ Real x = stem->hpos_f () - left_x + notewidth / 2;
+ if (stem->dir_ != dir_)
+ x += notewidth / 2;
+ else if (stem->dir_ == UP)
+ x += notewidth;
+ Real y = stem->dir_ == dir_ ? stem->stem_end_f ()
+ : stem->stem_begin_f () + 2.5 * dir_;
+
+ /*
+ leave a gap: slur mustn't touch head/stem
+ */
+ y += 2.5 * dir_;
+ y *= internote;
+ y -= left_y;
+
+ notes[i].x () = x;
+ notes[i].y () = y;
+ }
+ return notes;
+}
+
+Array<Offset>
+Slur::get_controls () const
+{
+ Bezier_bow b (paper ());
+ b.set (get_notes (), dir_);
+ b.calc ();
+ Array<Offset> controls;
+ controls.set_size (8);
+ for (int i = 0; i < 4; i++)
+ controls[i] = b.control_[i];
+ for (int i = 0; i < 4; i++)
+ controls[i + 4] = b.return_[i];
+ return controls;
}
projects / lilypond.git / blobdiff