Variability regions of close-to-convex functions

M. Biernacki gave in 1936 concrete forms of the variability regions of $z/f(z)$ and $zf'(z)/f(z)$ of close-to-convex functions $f$ for a fixed $z$ with $|z|<1$. The forms are, however, not necessarily convenient to determine the shape of the full variabil