colour.algebra.cartesian_to_polar¶
- colour.algebra.cartesian_to_polar(a: ArrayLike) numpy.ndarray [source]¶
Transform given cartesian coordinates array \(xy\) to polar coordinates array \(\rho\phi\) (radial coordinate, angular coordinate).
- Parameters
a (ArrayLike) – Cartesian coordinates array \(xy\) to transform.
- Returns
Polar coordinates array \(\rho\phi\), \(\rho\) is in range [0, +inf], \(\phi\) is in range [-pi, pi] radians, i.e. [-180, 180] degrees.
- Return type
References
[Wikipedia06a], [Wikipedia05b]
Examples
>>> a = np.array([3, 1]) >>> cartesian_to_polar(a) array([ 3.1622776..., 0.3217505...])