Challenge: Viewer of Equations 2-D

[compsystems]

Hello, the output "window" or view of the hp-prime (terminal) was designed only for the numeric environment or plain text HOME, so it does not print in pretty-print 2D, symbolic expressions (CAS)

The challenge is to create a viewer of equations, in first step can only be simulated a pretty print witn ascii chars as the following image



Someone knows some source code that can be ported to hp-prime?