Identify the trisection points of every line segment in the triangulation

def segment_tripoints(self, ratio=0.33333):
        """
        Identify the trisection points of every line segment in the triangulation
        """

        segments = self.identify_segments()
        points = self.points

        mids1 = ratio*points[segments[:,0]] + (1.0-ratio)*points[segments[:,1]]
        mids2 = (1.0-ratio)*points[segments[:,0]] + ratio*points[segments[:,1]]

        mids = np.vstack((mids1,mids2))
        mid_xpt, mid_ypt = mids[:,0], mids[:,1]

        return mid_xpt, mid_ypt