  We consider systems described by the two-dimensional Dirac equation where the
Fermi velocity is inhomogeneous as a consequence of mechanical deformations. We
show that the mechanical deformations can lead to deflection and focusing of
the wave packets. The analogy with known reflectionless quantum systems is
pointed out. Furthermore, with the use of the qualitative spectral analysis, we
discuss how inhomogeneous strains can be used to create waveguides for valley
polarized transport of partially dispersionless wave packets.
