Replacing an "Alphanumeric 16x2 LCD" with a "Smart-GPU color 320x240" display...

I have tried using the current library to run the Smart-GPU, but all I can get out of it is a graphical display(colors and shapes).

What "current library" would that be?

Is there a way to display an analog output from an Arduino MEGA 2650?

As text? As a voltage? As a dancing turtle?