public static List <Vector2> GiftWrap(List <Vector2> points)
{
if (points.Count == 0)
{
return(points);
}
Vector2 leftMost = points[0];
foreach (Vector2 point in points)
{
if (point.X < leftMost.X)
{
leftMost = point;
}
}
List <Vector2> wrappedPoints = new List <Vector2>();
Vector2 currPoint = leftMost;
Vector2 endPoint;
do
{
wrappedPoints.Add(currPoint);
endPoint = points[0];
for (int i = 1; i < points.Count; i++)
{
if (points[i] == currPoint)
{
continue;
}
if (currPoint == endPoint ||
MathUtils.VectorOrientation(currPoint, endPoint, points[i]) == -1)
{
endPoint = points[i];
}
}
currPoint = endPoint;
}while (endPoint != leftMost);
return(wrappedPoints);
}
