Transf WD Euler transformation

[CresitelloDittmar, Mark]

Laurent,

This came directly from the implementation group discussions back in Dec
2018.
gWCS has use cases where more than 3 rotations are useful, for example
EulerRotation(angles=[12, 1, 2, 3], axes=‘xyzx’).
So we've taken this approach of having a sequence of EulerAngles which
specify the 'axis of rotation' (of the 3D space as either 'x', 'y', or 'z')
and angle.

Mark


On Thu, Apr 2, 2020 at 8:31 AM Laurent MICHEL <
laurent.michel at astro.unistra.fr> wrote:

> Dear,
>
> My comment #1: Why is the Euler Transformation class so complex?
>
> - It is always a 3D transformation, this there is no reason to setup a
> 1-* aggregation with angles.
>
> - Euler angles (nutation, rotation, intrinsic rotation) are well
> defined, there is no need for a specific datatype (EulerAngle). So we
> could just have 3 class attributes.
>
> - Using a specific datatype where angles are identified by a the name of
> the rotation axis supposes we have a vocabulary for this, which is a bit
> complicated for this purpose with the risk a implementation errors.
>
> Take care of yourself.
>
> LM
>
> --
> ---- Laurent MICHEL              Tel  (33 0) 3 68 85 24 37
>       Observatoire de Strasbourg  Fax  (33 0) 3 68 85 24 32
>       11 Rue de l'Universite      Mail laurent.michel at astro.unistra.fr
>       67000 Strasbourg (France)   Web  http://astro.u-strasbg.fr/~michel
> ---
>
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