protected override void Reset()
{
base.Reset();
_scanbeam = null;
_activeEdges = null;
_sortedEdges = null;
DisposeAllPolyPts();
var lm = MinimaList;
while (lm != null)
{
InsertScanbeam(lm.Y);
lm = lm.Next;
}
}
private void InsertScanbeam(long y)
{
if (_scanbeam == null)
{
_scanbeam = new Scanbeam(y, null);
}
else if (y > _scanbeam.Y)
{
var newSb = new Scanbeam(y, _scanbeam);
_scanbeam = newSb;
}
else
{
var sb2 = _scanbeam;
while (sb2.Next != null && (y <= sb2.Next.Y))
sb2 = sb2.Next;
if (y == sb2.Y)
return; //ie ignores duplicates
var newSb = new Scanbeam(y, sb2.Next);
sb2.Next = newSb;
}
}
private long PopScanbeam()
{
Contract.Requires(_scanbeam != null);
var y = _scanbeam.Y;
_scanbeam = _scanbeam.Next;
return y;
}
public Scanbeam(long y, Scanbeam next)
{
Y = y;
Next = next;
}