Function getDistance

js/mui.gestures.js:49–56

(p1, p2, props)

	 * @returns {Number}
	 */
	var getDistance = function(p1, p2, props) {
		if (!props) {
			props = ['x', 'y'];
		}
		var x = p2[props[0]] - p1[props[0]];
		var y = p2[props[1]] - p1[props[1]];
		return sqrt((x * x) + (y * y));
	};
	/**
	 * scale
	 * @param {Object} starts