public static bool PointOnRay(Point p, Point a, Point b)
{
if (a.Equals(b))
{
return(true);
}
if (a.Equals(p))
{
return(true);
}
var q = a.VectorTo(p).Normalize();
var w = a.VectorTo(b).Normalize();
return(q.Equals(w));
}
public static double GetAngle(Point a, Point b, Point c)
{
Point vecBA = b.VectorTo(a);
Point vecBC = b.VectorTo(c);
double CP = CrossProduct(vecBA, vecBC);
double DP = DotProduct(vecBA, vecBC);
double radAngle = Math.Atan2(CP, DP);
if (radAngle < 0)
{
radAngle += Math.PI * 2;
}
double degAngle = radAngle * 180 / Math.PI;
return(degAngle);
}
