Resize fit/fill

resize.js

	/**
	 * @param {[number, number]} src
	 * @param {[number, number]} max
	 * @return {[number, number]}
	 */
	function fit (src, max) {
		var ratio = Math.min(max[0] / src[0], max[1] / src[1])
		return [src[0] * ratio, src[1] * ratio]
	}

	/**
	 * @param {[number, number]} src
	 * @param {[number, number]} max
	 * @return {[number, number]}
	 */
	function fill (src, max) {
		var ratio = Math.max(max[0] / src[0], max[1] / src[1])
		return [src[0] * ratio, src[1] * ratio]
	}

	/**
	 * @param {[number, number]} obj (width, height)
	 * @param {[number, number]} container (width, height)
	 * @return {[number, number]} (x, y)
	 */
	function center (obj, container) {
		return [container[0] / 2 - obj[0] / 2, container[1] / 2 - obj[1] / 2]
	}