private void HandleCircleEvent(CircleEvent circleEvent)
{
HalfEdge CL = circleEvent.L().GetHalfEdge();
if (CL.GetFace() == circleEvent.L().GetNode())
{
CL = CL.Twin();
}
HalfEdge CR = circleEvent.C().GetHalfEdge();
if (CR.GetFace() == circleEvent.R().GetNode())
{
CR = CR.Twin();
}
HalfEdge RC = CR.Twin();
RC.SetTarget(circleEvent);
CL.SetTarget(circleEvent);
circleEvent.halfEdge = CR;
EventTree.LeafNode prev = (EventTree.LeafNode)_eventTree.GetPreviousLeaf(circleEvent.GetCenterLeafNode());
EventTree.LeafNode next = (EventTree.LeafNode)_eventTree.GetNextLeaf(circleEvent.GetCenterLeafNode());
if (prev != null)
{
if (prev.GetDisappearEvent() != null)
{
_eventQueue.Delete(prev.GetDisappearEvent().GetHandle());
prev.SetDisappearEvent(null);
}
}
if (next != null)
{
if (next.GetDisappearEvent() != null)
{
_eventQueue.Delete(next.GetDisappearEvent().GetHandle());
next.SetDisappearEvent(null);
}
}
List <CircleEvent> newCircles = _eventTree.RemoveNode(circleEvent, prev, circleEvent.GetCenterLeafNode(), next);
if (newCircles != null)
{
foreach (CircleEvent ce in newCircles)
{
IPriorityQueueHandle <IEvent> h = null;
_eventQueue.Add(ref h, ce);
ce.SetHandle(h);
}
}
}
public static bool DoBreakpointsConverge(CircleEvent circleEvent)
{
bool clockwise = (circleEvent.L().GetNode().y - circleEvent.C().GetNode().y)
* (circleEvent.R().GetNode().x - circleEvent.C().GetNode().x) <=
(circleEvent.L().GetNode().x - circleEvent.C().GetNode().x)
* (circleEvent.R().GetNode().y - circleEvent.C().GetNode().y);
if (clockwise)
{
return(true);
}
else
{
return(false);
}
}
private void GetFinalNodePoint(EventTree.TreeNode node)
{
if (node is EventTree.LeafNode)
{
if (((EventTree.LeafNode)node).GetBreakpointNode() == null)
{
return;
}
Breakpoint b = ((EventTree.LeafNode)node).GetBreakpointNode().GetBreakpoint();
VectorNode n1 = b.getLeftListEvent().GetHalfEdge().GetFace();
VectorNode n2 = b.getLeftListEvent().GetHalfEdge().Twin().GetFace();
float centerx = 0.5f * (b.getLeftListEvent().GetHalfEdge().GetFace().x + b.getLeftListEvent().GetHalfEdge().Twin().GetFace().x);
float centery = 0.5f * (b.getLeftListEvent().GetHalfEdge().GetFace().y + b.getLeftListEvent().GetHalfEdge().Twin().GetFace().y);
if (n1.y == n2.y)
{
HalfEdge he = b.getLeftListEvent().GetHalfEdge();
CircleEvent ce = new CircleEvent(centerx, -_openEdgeLimit /* neg infinity */);
if (he.GetTarget() == null)
{
he.SetTarget(ce);
ce.halfEdge = he;
}
else
{
he.Twin().SetTarget(ce);
ce.halfEdge = he.Twin();
}
_allCircleEvents.Add(ce);
}
else
{
float grad = (n2.y - n1.y) * 1.0f / (n2.x - n1.x);
float realGrad = -1.0f / grad;
float constant = centery - realGrad * centerx;
float bpx = b.getX() - centerx;
float bpy = b.getY() - centery;
//if x = bpx...
float testx = centerx + 10000f;
float testy = testx * realGrad + constant;
CircleEvent ce;
if (testx * bpx + testy * bpy > 0)
{
ce = new CircleEvent(testx, testy);
}
else
{
ce = new CircleEvent(centerx - 10000, (centerx - 10000) * realGrad + constant);
}
HalfEdge he = b.getLeftListEvent().GetHalfEdge();
if (he.GetFace() != b.getLeftListEvent().GetNode())
{
he = he.Twin();
}
if (he.GetTarget() == null)
{
he.SetTarget(ce);
}
else if (he.Twin().GetTarget() == null)
{
he.Twin().SetTarget(ce);
}
else
{
// big problem... should never happen
}
_allCircleEvents.Add(ce);
}
return;
}
else
{
Breakpoint b = ((EventTree.BreakpointNode)node).GetBreakpoint();
b.CalculateBreakpoint(_openEdgeLimit);
if (node.LChild() != null)
{
GetFinalNodePoint(node.LChild());
}
if (node.RChild() != null)
{
GetFinalNodePoint(node.RChild());
}
}
}
public void SetTarget(CircleEvent circleEvent)
{
_target = circleEvent;
}