void Voronoi::RemoveParabola(VEvent * e)
{
VParabola * p1 = e->arch;
VParabola * xl = VParabola::GetLeftParent(p1);
VParabola * xr = VParabola::GetRightParent(p1);
VParabola * p0 = VParabola::GetLeftChild(xl);
VParabola * p2 = VParabola::GetRightChild(xr);
if(p0 == p2) std::cout << "chyba - pravá a levá parabola má stejné ohnisko!\n";
if(p0->cEvent){ deleted.insert(p0->cEvent); p0->cEvent = 0; }
if(p2->cEvent){ deleted.insert(p2->cEvent); p2->cEvent = 0; }
VPoint * p = new VPoint(e->point->x, GetY(p1->site, e->point->x));
points.push_back(p);
xl->edge->end = p;
xr->edge->end = p;
VParabola * higher = nullptr;
VParabola * par = p1;
while(par != root)
{
par = par->parent;
if(par == xl) higher = xl;
if(par == xr) higher = xr;
}
higher->edge = new VEdge(p, p0->site, p2->site);
edges->push_back(higher->edge);
VParabola * gparent = p1->parent->parent;
if(p1->parent->Left() == p1)
{
if(gparent->Left() == p1->parent) gparent->SetLeft ( p1->parent->Right() );
if(gparent->Right() == p1->parent) gparent->SetRight( p1->parent->Right() );
}
else
{
if(gparent->Left() == p1->parent) gparent->SetLeft ( p1->parent->Left() );
if(gparent->Right() == p1->parent) gparent->SetRight( p1->parent->Left() );
}
delete p1->parent;
delete p1;
CheckCircle(p0);
CheckCircle(p2);
}
VParabola * VParabola::GetLeftChild (VParabola * p)
{
if(!p) return 0;
VParabola * par = p->Left();
while(!par->isLeaf) par = par->Right();
return par;
}
VParabola * VParabola::GetRightParent (VParabola * p)
{
VParabola * par = p->parent;
VParabola * pLast = p;
while(par->Right() == pLast)
{
if(!par->parent) return 0;
pLast = par; par = par->parent;
}
return par;
}
VParabola * Voronoi::GetParabolaByX(double xx)
{
VParabola * par = root;
double x = 0.0;
while(!par->isLeaf)
{
x = GetXOfEdge(par, ly);
if(x>xx) par = par->Left();
else par = par->Right();
}
return par;
}
VParabola * Voronoi::GetParabolaByX(double xx){
VParabola * par = root;
double x = 0.0;
while(!par->isLeaf) {
// projdu stromem dokud nenarazím na vhodný list
x = GetXOfEdge(par, ly);
if(x>xx){
par = par->Left();
}else{
par = par->Right();
}
}
return par;
}
