Hi,
Finally functional scale.. I am using blitString as EgonOlsen suggested.
All calculations are done at onDrawFrame() and speed is very good.
I am using absolute scale and positioning now (800x480 lanscape) of scale, so I have to think of how to make it relative to the screen size and HUD frame..
You can check result here:
http://quadrodynamics.com/PrimaryFlightDisplay.apkGreetings!