is there a way to read signals from an ADC on Raspberry Pi with FLTK ?

I already have installed FLTK on Raspberry Pi and make some Apps and it works.

But now i need to read data for example from a potentiometer which goes on a ADC MCP3008 and show the data on my FLTK on a scope like a oszilloskop.

I have the Oszilloskop-App to show the data.

And i can read the data from the ADC on my Raspberry Pi with a make-file (without FLTK).

The problem is that i have to read it with fltk to show it with the app.

Every data input should be shown instead, so there is no way to first put the data in a txt-file.

If you have any idea,

Thank you very much