Color Wheels, Pi and Degrees

Trigonometry (zero is up instead of right)

TP color wheel

(TP "Hue" is from 0 to almost 6 (e.g. 5.9999, but 6 will return black)

Saturation and Value are both values from 0.0 to 1.0 (e.g. 0 to 100%)

With "zero" facing to the right (in X-positive direction):

With "zero" facing up (in Y-positive direction):