public double AngleInDegreeWith(EuclidianVector v1)
{
var cosAngle = ScalarProductWith(v1) / (Norm * v1.Norm);
var angleInGradian = Math.Acos(cosAngle);
var angleInDegree = EuclidianTools.RadianToDegree(angleInGradian) % 360;
if (angleInDegree > 180)
{
angleInDegree = -(360 - angleInDegree);
}
return(angleInDegree);
}
public double ScalarProductWith(EuclidianVector v1)
{
return(X * v1.X + Y * v1.Y);
}