public EdgeReorderer(List <Edge> edges, SiteOrVertex criterion)
{
Edges = new List <Edge>();
EdgeOrientations = new List <Side>();
if (edges.Count > 0)
{
Edges = ReorderEdges(edges, criterion);
}
}
public EdgeReorderer(List<Edge> edges, SiteOrVertex criterion)
{
Edges = new List<Edge>();
EdgeOrientations = new List<Side>();
if (edges.Count > 0)
{
Edges = ReorderEdges(edges, criterion);
}
}
private List <Edge> ReorderEdges(List <Edge> edges, SiteOrVertex criterion)
{
var n = edges.Count;
// we're going to reorder the edges in order of traversal
var done = new bool[n];
var nDone = 0;
for (var j = 0; j < n; j++)
{
done[j] = false;
}
var newEdges = new List <Edge>();
var i = 0;
var edge = edges[i];
newEdges.Add(edge);
EdgeOrientations.Add(Side.Left);
var firstPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.LeftVertex : edge.LeftSite;
var lastPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.RightVertex :edge.RightSite;
if (firstPoint == Vertex.VertexAtInfiniy || lastPoint == Vertex.VertexAtInfiniy)
{
return(new List <Edge>());
}
done[i] = true;
++nDone;
while (nDone < n)
{
for (i = 1; i < n; ++i)
{
if (done[i])
{
continue;
}
edge = edges[i];
var leftPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.LeftVertex : edge.LeftSite;
var rightPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.RightVertex : edge.RightSite;
if (leftPoint == Vertex.VertexAtInfiniy || rightPoint == Vertex.VertexAtInfiniy)
{
return(new List <Edge>());
}
if (leftPoint == lastPoint)
{
lastPoint = rightPoint;
EdgeOrientations.Add(Side.Left);
newEdges.Add(edge);
done[i] = true;
}
else if (rightPoint == firstPoint)
{
firstPoint = leftPoint;
EdgeOrientations.Insert(0, Side.Left);
newEdges.Insert(0, edge);
done[i] = true;
}
else if (leftPoint == firstPoint)
{
firstPoint = rightPoint;
EdgeOrientations.Insert(0, Side.Right);
newEdges.Insert(0, edge);
done[i] = true;
}
else if (rightPoint == lastPoint)
{
lastPoint = leftPoint;
EdgeOrientations.Add(Side.Right);
newEdges.Add(edge);
done[i] = true;
}
if (done[i])
{
++nDone;
}
}
}
return(newEdges);
}
private List<Edge> ReorderEdges(List<Edge> edges, SiteOrVertex criterion)
{
var n = edges.Count;
// we're going to reorder the edges in order of traversal
var done = new bool[n];
var nDone = 0;
for (var j = 0; j < n; j++)
{
done[j] = false;
}
var newEdges = new List<Edge>();
var i = 0;
var edge = edges[i];
newEdges.Add(edge);
EdgeOrientations.Add(Side.Left);
var firstPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.LeftVertex : edge.LeftSite;
var lastPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.RightVertex :edge.RightSite;
if (firstPoint == Vertex.VertexAtInfiniy || lastPoint == Vertex.VertexAtInfiniy)
{
return new List<Edge>();
}
done[i] = true;
++nDone;
while (nDone < n)
{
for (i = 1; i < n; ++i)
{
if (done[i])
{
continue;
}
edge = edges[i];
var leftPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.LeftVertex : edge.LeftSite;
var rightPoint = (criterion == SiteOrVertex.Vertex) ? (ICoordinate)edge.RightVertex : edge.RightSite;
if (leftPoint == Vertex.VertexAtInfiniy || rightPoint == Vertex.VertexAtInfiniy)
{
return new List<Edge>();
}
if (leftPoint == lastPoint)
{
lastPoint = rightPoint;
EdgeOrientations.Add(Side.Left);
newEdges.Add(edge);
done[i] = true;
}
else if (rightPoint == firstPoint)
{
firstPoint = leftPoint;
EdgeOrientations.Insert(0, Side.Left);
newEdges.Insert(0, edge);
done[i] = true;
}
else if (leftPoint == firstPoint)
{
firstPoint = rightPoint;
EdgeOrientations.Insert(0, Side.Right);
newEdges.Insert(0, edge);
done[i] = true;
}
else if (rightPoint == lastPoint)
{
lastPoint = leftPoint;
EdgeOrientations.Add(Side.Right);
newEdges.Add(edge);
done[i] = true;
}
if (done[i])
{
++nDone;
}
}
}
return newEdges;
}