function isPointsSame(points1, points2) {
	        if (points1.length !== points2.length) {
	            return;
	        }
	        for (var i = 0; i < points1.length; i++) {
	            var p1 = points1[i];
	            var p2 = points2[i];
	            if (p1[0] !== p2[0] || p1[1] !== p2[1]) {
	                return;
	            }
	        }
	        return true;
	    }
@param {module:echarts/coord/cartesian/Cartesian2D|module:echarts/coord/polar/Polar} coordSys
@param {module:echarts/data/List} data
@param {Array.<Array.<number>>} points
@private