Programming graphic systems

[Olivier Scalbert <olivier.scalbert@algosyn.com>]

Hello,

When playing with my GPS, I was thinking of the beautiful graphic 
systems used in safety critical environment (medical, aircraft, ATC, ...).
I assume lots of them must be written in Ada. I was asking myself how 
are they programmed mainly at the graphic level. Does the application 
part use a graphic toolkit provided by the graphic board manufacturer or 
do you have to program all the graphic primitives yourself in Ada (as 
Bresenham line algorithm, ...) and written to the raster memory (which 
must be very cool!) ?

Thanks for your info,

Olivier