Allusion is the type of figurative language used here, I believe.
Try this pdf.
It's quite easy to understand and to formulate your opinion on the subject.
Hope it helps and good luck!
Oedipus Rex, also known by its Greek title, Oedipus Tyrannus, or Oedipus the King, is an Athenian tragedy by Sophocles that was first performed around 429 BC. Originally, to the ancient Greeks, the title was simply Oedipus, as it is referred to by Aristotle
