function computeOffsets(table, ticks, min, max, options) {
	var start = 0;
	var end = 0;
	var first, last;

	if (options.offset && ticks.length) {
		first = interpolate$1(table, 'time', ticks[0], 'pos');
		if (ticks.length === 1) {
			start = 1 - first;
		} else {
			start = (interpolate$1(table, 'time', ticks[1], 'pos') - first) / 2;
		}
		last = interpolate$1(table, 'time', ticks[ticks.length - 1], 'pos');
		if (ticks.length === 1) {
			end = last;
		} else {
			end = (last - interpolate$1(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
		}
	}

	return {start: start, end: end, factor: 1 / (start + 1 + end)};
}
Returns the start and end offsets from edges in the form of {start, end}
where each value is a relative width to the scale and ranges between 0 and 1.
They add extra margins on the both sides by scaling down the original scale.
Offsets are added when the `offset` option is true.