public void QuickHull()
{
var ltl = CGUtils.LowestThenLeftmost(points);
var htr = CGUtils.HighestThenRightmost(points);
List <CGPoint> leftPoints = new List <CGPoint>();
List <CGPoint> rightPoints = new List <CGPoint>();
leftPoints.Add(ltl);
rightPoints.Add(htr);
for (int i = 0; i < points.Count; i++)
{
if (points[i] != ltl && points[i] != htr)
{
if (CGUtils.ToLeft(ltl, htr, points[i]))
{
leftPoints.Add(points[i]);
}
else
{
rightPoints.Add(points[i]);
}
}
}
leftPoints.Add(htr);
rightPoints.Add(ltl);
QuickHull(leftPoints, 0, leftPoints.Count - 1);
QuickHull(rightPoints, 0, rightPoints.Count - 1);
}
void InitLeftRightChain()
{
var htr = CGUtils.HighestThenRightmost(p.vertices);
var ltl = CGUtils.LowestThenLeftmost(p.vertices);
int index = 0;
var leftCurr = htr;
while (leftCurr != ltl)
{
leftChain.Add(index++, leftCurr);
leftCurr = leftCurr.succ;
}
leftChain.Add(index++, ltl);
var rightCurr = htr.pred;
while (rightCurr != ltl)
{
rightChain.Add(index++, rightCurr);
rightCurr = rightCurr.pred;
}
}