private void CheckCircleEvent(VParabola parabola)
{
VEdge leftEdge = parabola.LeftEdge;
VEdge rightEdge = parabola.RightEdge;
if (!VEdge.HasValidIntersectPoint(leftEdge, rightEdge))
{
return;
}
Vector3 intersectPoint = VEdge.GetIntersectPoint(leftEdge, rightEdge);
float distance = Vector3.Distance(intersectPoint, parabola.FocusPoint);
float targetLy = intersectPoint.z - distance;
Vector3 circlePoint = new Vector3(parabola.FocusPoint.x, 0, targetLy);
VEvent algorithmEvent = new VEvent(circlePoint, false);
algorithmEvent.Parabola = parabola;
algorithmEvent.VertexPoint = intersectPoint;
parabola.CircleEvent = algorithmEvent;
m_eventQueues.Add(algorithmEvent);
SortEventQueues();
}
private void AddCircleEvent(VEvent algorithmEvent)
{
List <VParabola> removeParabolas = new List <VParabola>();
VParabola removeParabola = algorithmEvent.Parabola;
VParabola leftParabola = removeParabola.LeftParabola;
VParabola rightParabola = removeParabola.RightParabola;
if (leftParabola == null || rightParabola == null)
{
return;
}
removeParabolas.Add(removeParabola);
if (removeParabolas.Count == 0)
{
return;
}
if (leftParabola.CircleEvent != null)
{
m_eventQueues.Remove(leftParabola.CircleEvent);
leftParabola.CircleEvent = null;
}
if (rightParabola.CircleEvent != null)
{
m_eventQueues.Remove(rightParabola.CircleEvent);
rightParabola.CircleEvent = null;
}
Vertices.Add(algorithmEvent.VertexPoint);
VEdge edge = new VEdge(algorithmEvent.VertexPoint, leftParabola.FocusPoint, rightParabola.FocusPoint);
Edges.Add(edge);
leftParabola.RightParabola = rightParabola;
leftParabola.RightEdge = edge;
rightParabola.LeftParabola = leftParabola;
rightParabola.LeftEdge = edge;
for (int i = 0; i < removeParabolas.Count; i++)
{
m_eventQueues.Remove(removeParabolas[i].CircleEvent);
removeParabolas[i].CircleEvent = null;
removeParabolas[i].LeftEdge.SetVertexPoint(algorithmEvent.VertexPoint);
removeParabolas[i].RightEdge.SetVertexPoint(algorithmEvent.VertexPoint);
m_parabolas.Remove(removeParabolas[i]);
}
CheckCircleEvent(leftParabola);
CheckCircleEvent(rightParabola);
}
public void AddSiteEvent(Vector3 site, float ly)
{
if (m_parabolas.Count == 0)
{
m_parabolas.Add(new VParabola(site));
return;
}
int beachLineIndex = GetBeachLineByX(site.x, ly);
VParabola beachLineParabola = m_parabolas[beachLineIndex];
VParabola p0 = null;
VParabola p1 = null;
VParabola p2 = null;
if (beachLineParabola.FocusPoint.z == site.z)
{
Vector3 startPoint = new Vector3((beachLineParabola.FocusPoint.x + site.x) / 2, 0, m_border.HalfHeight);
VEdge edge = null;
if (beachLineParabola.FocusPoint.x < site.x)
{
edge = new VEdge(startPoint, beachLineParabola.FocusPoint, site);
p0 = new VParabola(beachLineParabola.FocusPoint);
p1 = new VParabola(site);
}
else
{
edge = new VEdge(startPoint, site, beachLineParabola.FocusPoint);
p0 = new VParabola(site);
p1 = new VParabola(beachLineParabola.FocusPoint);
}
Edges.Add(edge);
p0.LeftParabola = beachLineParabola.LeftParabola;
p0.LeftEdge = beachLineParabola.LeftEdge;
p0.RightEdge = edge;
p0.RightParabola = p1;
p1.LeftParabola = p0;
p1.LeftEdge = edge;
p1.RightEdge = beachLineParabola.RightEdge;
p1.RightParabola = beachLineParabola.RightParabola;
if (p0.LeftParabola != null)
{
p0.LeftParabola.RightParabola = p0;
}
if (p1.RightParabola != null)
{
p1.RightParabola.LeftParabola = p1;
}
m_parabolas.RemoveAt(beachLineIndex);
m_parabolas.Insert(beachLineIndex, p0);
m_parabolas.Insert(beachLineIndex + 1, p1);
CheckCircleEvent(p0);
CheckCircleEvent(p1);
return;
}
if (beachLineParabola.CircleEvent != null)
{
m_eventQueues.Remove(beachLineParabola.CircleEvent);
beachLineParabola.CircleEvent = null;
}
Vector3 edgeStartPoint = new Vector3(site.x, 0, VParabolaUtils.GetParabolaValueZ(beachLineParabola.FocusPoint, ly, site.x));
VEdge leftEdge = new VEdge(edgeStartPoint, beachLineParabola.FocusPoint, site);
VEdge rightEdge = new VEdge(edgeStartPoint, site, beachLineParabola.FocusPoint);
Edges.Add(leftEdge);
Edges.Add(rightEdge);
p0 = new VParabola(beachLineParabola.FocusPoint);
p1 = new VParabola(site);
p2 = new VParabola(beachLineParabola.FocusPoint);
p0.LeftParabola = beachLineParabola.LeftParabola;
p0.LeftEdge = beachLineParabola.LeftEdge;
p0.RightEdge = leftEdge;
p0.RightParabola = p1;
p1.LeftParabola = p0;
p1.LeftEdge = leftEdge;
p1.RightEdge = rightEdge;
p1.RightParabola = p2;
p2.LeftParabola = p1;
p2.LeftEdge = rightEdge;
p2.RightEdge = beachLineParabola.RightEdge;
p2.RightParabola = beachLineParabola.RightParabola;
if (p0.LeftParabola != null)
{
p0.LeftParabola.RightParabola = p0;
}
if (p2.RightParabola != null)
{
p2.RightParabola.LeftParabola = p2;
}
m_parabolas.RemoveAt(beachLineIndex);
m_parabolas.Insert(beachLineIndex, p0);
m_parabolas.Insert(beachLineIndex + 1, p1);
m_parabolas.Insert(beachLineIndex + 2, p2);
CheckCircleEvent(p0);
CheckCircleEvent(p2);
}