public static Vertex Create(Vertex v1, Vertex v2, double alpha)
{
var v = v2.ToPoint() - v1.ToPoint();
v = v / v.Length * alpha;
var p = v1.ToPoint() + v;
var vertex = new Vertex() { X = p.X, Y = p.Y, IsIntersect = true,Alpha = alpha};
return vertex;
}
public bool Contains(Vertex point)
{
int windNumber = 0;
Vertex si = this;
do
{
if (si.Y <= point.Y)
{
if (si.Next.Y > point.Y)
{
if (Triangle.GetSignedArea(si.ToPoint(), si.Next.ToPoint(), point.ToPoint()) > 0)
windNumber++;
}
}
else
{
if (si.Next.Y <= point.Y)
if (Triangle.GetSignedArea(si.ToPoint(), si.Next.ToPoint(), point.ToPoint()) < 0)
windNumber--;
}
si = si.Next;
} while (si != this);
return (windNumber & 1) != 0;
}