function edgeGetParent(path) {
                path = this.parsePath(path);
                return (path && path[0] === 'label')
                    ? fakeSeriesModel
                    : (path && path[0] === 'emphasis' && path[1] === 'label')
                    ? emphasisFakeSeriesModel
                    : this.parentModel;
            }
Line path for bezier and straight line draw