Function wrapRange

Performs a calculation within a wrapping number range. This is a lower-level function. See also: wrapInteger for simple wrapping within a range.

min and max define the start and end of the valid range, inclusive. Eg for hue degrees it'd be 0, 360. a and b is the range you want to work in.

For example, let's say you want to get the middle point between a hue of 30 and a hue of 330 (ie warmer colours):

wrapRange(0,360, (distance) => {
 // for a:0 and b:330, distance would be 90 from 30 degrees to 330 (via zero)
 return distance * 0.5; // eg return middle point
}, 30, 330);
Copy

The return value of the callback should be in the range of 0-distance. wrapRange will subsequently conform it to the min and max range before it's returned to the caller.