public static void Endpoint(Edge e, LR lr, Site s)
{
e.Vertices[lr] = s;
if (e.Vertices[LR.Other(lr)] == null)
{
return;
}
Out.Endpoint(e);
}
public static HalfEdge Create(Edge e, LR lr)
{
var answer = new HalfEdge {
Edge = e,
LeftRight = lr,
PriorityQueueNext = null,
Vertex = null,
};
return(answer);
}
public static LR Other(LR lr)
{
return(lr == Left ? Right : Left);
}
protected bool Equals(LR other)
{
return(_lr == other._lr);
}
public void Compute(List <Site> sites)
{
var pq = new PriorityQueue(Geometry.SqrtNumSites);
var el = new EdgeList(Geometry.SqrtNumSites);
var i = 0;
el.BottomSite = sites[i++];
Out.Site(el.BottomSite);
var newSite = sites[i++];
var newIntStar = new Vector2(float.MaxValue);
while (true)
{
if (!pq.Empty)
{
newIntStar = pq.Min();
}
if (newSite != null &&
(pq.Empty || newSite.Coord.Y < newIntStar.Y || (newSite.Coord.Y == newIntStar.X && newSite.Coord.X < newIntStar.X)))
{
Out.Site(newSite);
var lbnd = el.LeftBound(newSite.Coord);
var rbnd = el.Right(lbnd);
var bot = el.RightRegion(lbnd);
var e = Geometry.Bisect(bot, newSite);
var bisector = HalfEdge.Create(e, LR.Left);
el.Insert(lbnd, bisector);
var p = Geometry.Intersect(lbnd, bisector);
if (p != null)
{
pq.Delete(lbnd);
pq.Insert(lbnd, p, Geometry.Dist(p, newSite));
}
lbnd = bisector;
bisector = HalfEdge.Create(e, LR.Right);
el.Insert(lbnd, bisector);
p = Geometry.Intersect(bisector, rbnd);
if (p != null)
{
pq.Insert(bisector, p, Geometry.Dist(p, newSite));
}
newSite = i < sites.Count ? sites[i++] : null;
}
else if (!pq.Empty)
{
var lbnd = pq.ExtractMin();
var llbnd = el.Left(lbnd);
var rbnd = el.Right(lbnd);
var rrbnd = el.Right(rbnd);
var bot = el.LeftRegion(lbnd);
var top = el.RightRegion(rbnd);
Out.Triplet(bot, top, el.RightRegion(lbnd));
var v = lbnd.Vertex;
Geometry.Makevertex(v);
Geometry.Endpoint(lbnd.Edge, lbnd.LeftRight, v);
Geometry.Endpoint(rbnd.Edge, rbnd.LeftRight, v);
el.Delete(lbnd);
pq.Delete(rbnd);
el.Delete(rbnd);
var lr = LR.Left;
if (bot.Coord.X > top.Coord.Y)
{
var temp = bot;
bot = top;
top = temp;
lr = LR.Right;
}
var e = Geometry.Bisect(bot, top);
var bisector = HalfEdge.Create(e, lr);
el.Insert(llbnd, bisector);
Geometry.Endpoint(e, LR.Other(lr), v);
var p = Geometry.Intersect(llbnd, bisector);
if (p != null)
{
pq.Delete(llbnd);
pq.Insert(llbnd, p, Geometry.Dist(p, bot));
}
p = Geometry.Intersect(bisector, rrbnd);
if (p != null)
{
pq.Insert(bisector, p, Geometry.Dist(p, bot));
}
}
else
{
break;
}
}
for (var lbnd = el.Right(el.LeftEnd); lbnd != el.RightEnd; lbnd = el.Right(lbnd))
{
var e = lbnd.Edge;
Out.Endpoint(e);
Edges.Add(e);
}
}