public void TestFunctionAcos()
{
mockSparkContextProxy.Setup(m => m.CreateFunction(It.IsAny <string>(), It.IsAny <IColumnProxy>()));
Column column = GeneratorColum();
Functions.Acos(column);
mockSparkContextProxy.Verify(m => m.CreateFunction("acos", column.ColumnProxy), Times.Once);
}
/// <summary>
/// Return the axis angle representation of a unit quaternion.
/// </summary>
/// <param name="value">A unit quaternion.</param>
/// <returns>The axis angle of a quaternion.</returns>
public static Tuple <Vector3f, float> AxisAngle(Quaternionf value)
{
var s = Functions.Sqrt(1 - value.A - value.A);
return(Tuple.Create(
new Vector3f(value.B / s, value.C / s, value.D / s),
2 * Functions.Acos(value.A)));
}
/// <summary>
/// Transforms a point in cartesian coordinates to spherical coordinates.
/// </summary>
/// <param name="value">The point to transform.</param>
/// <returns>The spherical coordinates of value.</returns>
public static SphericalCoordinate CartesianToSpherical(Point3f value)
{
double r = Functions.Sqrt(value.X * value.X + value.Y * value.Y + value.Z * value.Z);
double theta = Functions.Atan2(value.Y, value.X);
if (theta < 0)
{
theta += 2 * Constants.Pi;
}
return(new SphericalCoordinate(
r,
(double)Functions.Acos(value.Z / r),
theta));
}
/// <summary>
/// Interpolates between two unit quaternions, using spherical linear interpolation.
/// </summary>
/// <param name="start">Start quaternion.</param>
/// <param name="end">End quaternion.</param>
/// <param name="amount">Value between 0 and 1 indicating the weight of <paramref name="end"/>.</param>
/// <returns>The spherical linear interpolation of the two quaternions.</returns>
/// <remarks>
/// Passing <paramref name="amount"/> a value of 0 will cause <paramref name="start"/> to be returned; a value of 1 will cause <paramref name="end"/> to be returned.
/// </remarks>
public static Quaternionf Slerp(Quaternionf start, Quaternionf end, float amount)
{
var cosTheta = Dot(start, end);
//Cannot use slerp, use lerp instead
if (Functions.Abs(cosTheta) - 1 < float.Epsilon)
{
return(Lerp(start, end, amount));
}
var theta = Functions.Acos(cosTheta);
var sinTheta = Functions.Sin(theta);
var t0 = Functions.Sin((1 - amount) * theta) / sinTheta;
var t1 = Functions.Sin(amount * theta) / sinTheta;
return(t0 * start + t1 * end);
}
