/// <summary>
/// Gets the angle in degrees between this vector and another.
/// </summary>
/// <param name="other">The other vector to get the angle to.</param>
/// <remarks>See http://en.wikipedia.org/wiki/Dot_product</remarks>
public decimal AngleTo(Vector2D other)
{
if (this.IsNull || other.IsNull)
{
throw new Exception("Can't find angle when one or both vectors are null vectors!");
}
// Cos(theta) = DotProduct(v1,v2) / (length(v1) * length(v2))
// aka theta = acos(v.normalize.dot(other.normalize)), however, the equation
// used gives us better precision
return(DecimalEx.ToDeg(DecimalEx.ACos(this.Dot(other) / (this.Magnitude * other.Magnitude))));
}
/// <summary>
/// Gets angle in degrees from the adjacent side and the hypotenuse.
/// </summary>
/// <param name="adjacentSide">Length of the known side adjacent to the angle.</param>
/// <param name="hypotenuse">Length of the hypotenuse.</param>
public static decimal GetAngleFromAdjSideHyp(decimal adjacentSide, decimal hypotenuse)
{
// cos(a) = adjacentSide / hypotenuse
// a = acos(adjacentSide / hypotenuse)
return(DecimalEx.ToDeg(DecimalEx.ACos(adjacentSide / hypotenuse)));
}
