/// <summary>
/// Returns the angle between the specified vectors in radians.
/// </summary>
/// <remarks>
/// See http://www.euclideanspace.com/maths/algebra/vectors/angleBetween/index.htm for details.
/// </remarks>
/// <param name="v">First vector.</param>
/// <param name="w">Second vector.</param>
/// <returns>Angle between the specified vectors in radians.</returns>
public static float Between(Vector2F v, Vector2F w)
{
return(Atan2(w.Y, w.X) - Atan2(v.Y, v.X));
}
/// <summary>
/// Returns the angle between the specified vector and the x-axis.
/// Example: FromVector(0.5, 0.5) will return DegreesToRadians(45).
/// </summary>
/// <remarks>
/// See http://stackoverflow.com/questions/6247153/angle-from-2d-unit-vector for details.
/// </remarks>
/// <param name="v">Vector to get the angle of.</param>
/// <returns>Angle between the specified vector and the x-axis.</returns>
public static float FromVector(Vector2F v)
{
var normalized = v.Normalize();
return(Atan2(normalized.Y, normalized.X));
}