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#include "beam.hh"
#include "debug.hh"
#include "symbol.hh"
#include "molecule.hh"
#include "leastsquares.hh"
#include "pcol.hh"
#include "stem.hh"
#include "paper.hh"
#include "lookup.hh"
struct Stem_info {
Real x;
Real idealy;
Real miny;
int no_beams;
Stem_info(){}
Stem_info(const Stem*);
};
Stem_info::Stem_info(const Stem*s)
{
x = s->hpos();
int dir = s->dir;
idealy = MAX(dir*s->top, dir*s->bot);
miny = MAX(dir*s->minnote, dir*s-> maxnote);
assert(miny <= idealy);
no_beams = s->flag;
}
/****************/
Beam::Beam()
{
slope = 0;
left_pos = 0.0;
dir =0;
}
void
Beam::add(Stem*s)
{
stems.bottom().add(s);
s->print_flag = false;
}
void
Beam::set_default_dir()
{
int dirs[2];
dirs[0]=0; dirs[1] =0;
for (PCursor<Stem*> sc(stems); sc.ok(); sc++) {
sc->set_default_dir();
dirs[(sc->dir+1)/2] ++;
}
dir = (dirs[0] > dirs[1]) ? -1 : 1;
for (PCursor<Stem*> sc(stems); sc.ok(); sc++) {
sc->dir = dir;
}
}
void
Beam::solve_slope()
{
svec<Stem_info> sinfo;
for (PCursor<Stem* >sc(stems); sc.ok(); sc++) {
sc->set_default_extents();
Stem_info i(sc);
sinfo.add(i);
}
Real leftx = sinfo[0].x;
Least_squares l;
for (int i=0; i < sinfo.sz(); i++) {
sinfo[i].x -= leftx;
l.input.add(Offset(sinfo[i].x, sinfo[i].idealy));
}
l.minimise(slope, left_pos);
Real dy = 0.0;
for (int i=0; i < sinfo.sz(); i++) {
Real y = sinfo[i].x * slope + left_pos;
Real my = sinfo[i].miny;
if (my - y > dy)
dy = my -y;
}
left_pos += dy;
left_pos *= dir;
slope *= dir;
{Real inter =paper()->interline()/2;
Real unitslope = slope*inter;
// set beamslope, for setting stems correctly
// ignoring return.
Symbol sy = paper()->lookup_->beam(unitslope, width().length());
slope =unitslope / inter;
}
}
void
Beam::set_stemlens()
{
PCursor<Stem*> s(stems);
Real x0 = s->hpos();
for (; s.ok() ; s++) {
Real x = s->hpos()-x0;
s->set_stemend(left_pos + slope * x);
}
}
void
Beam::calculate()
{
assert(stems.size()>1);
if (!dir)
set_default_dir();
solve_slope();
set_stemlens();
}
void
Beam::process()
{
calculate();
brew_molecule();
}
// todo.
Spanner *
Beam::broken_at(const PCol *, const PCol *) const
{
return new Beam(*this);
}
void
Beam::preprocess()
{
left = (*stems.top()) ->pcol_;
right = (*stems.bottom())->pcol_;
}
Interval
Beam::height() const
{
return output->extent().y;
}
Interval
Beam::width() const
{
Beam * me = (Beam*) this; // ugh
return Interval( (*me->stems.top()) ->hpos(),
(*me->stems.bottom()) ->hpos() );
}
void
Beam::brew_molecule()
{
Real inter=paper()->interline()/2;
Real sl = slope*inter;
Real w = width().length() + paper()->rule_thickness();
Symbol s = paper()->lookup_->beam(sl,w);
Atom a(s);
Real dx = width().min -left->hpos;
a.translate(Offset(dx,left_pos*inter));
output = new Molecule(a);
}
void
Beam::print()const
{
mtor << "Beam, slope " <<slope << "left ypos " << left_pos<<'\n';
}
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