Generateing a Color-Ramp
The illustration above shows the full color ramp generated by the
function.
hStart [, , , etc.]
sets the starting hue, at the darkest color in generated ramp.
hCycles [, , , ]
Defines the about of hue variation in the ramp. 1 is a full cycle around the starting hue, 0.5 is half a cycle (complementary color), -0.5 is half a cycle in the opposite direction.