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/**
 * constrain a number between an upper and lower bound
 * @param  {num} min   lower bound
 * @param  {num} value value to be constrained
 * @param  {num} max   upper bound
 * @return {num}       the constrained value
 */
function constrain(min, value, max) {
	if (value > max)
		return max;
	else if (value < min)
		return min;
	else
		return value;
}