Am 23.11.2016 um 02:11 schrieb Mike Horvath:

>> I am also not sure if using atan2 is good, since that only covers 90
>> degrees, whereas the hue circle must use all 360 degrees.
>>
>> Mike
> 
> Sorry. Disregard that. It works.

That's the fun thing about `atan2(a,b)`: In contrast to `atan(a/b)` it
doesn't lose the information about the quadrant; it also avoids the
singularity at b=0 (provided a<>0).

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