PerimeterEdge CreateDoubleLinkedListOfPerimeter()
{
var firstEdge = front.First().Edge;
var edge = firstEdge;
PerimeterEdge pe, prevPe = null, listStart = null;
do
{
pe = CreatePerimeterElementFromEdge(edge);
edge = FindNextEdgeOnPerimeter(edge);
if (prevPe != null)
{
pe.Prev = prevPe;
prevPe.Next = pe;
}
else
{
listStart = pe;
}
prevPe = pe;
} while (edge != firstEdge);
listStart.Prev = pe;
pe.Next = listStart;
return(listStart);
}