It's very useful if you make clip or sprite animation!
I try to move immage across the screen - but can't do this without additional errasing the copies of this immage.
I mean ---->
Tha function in language drawimage(handle, sx, sy) just drawing the copies of image.
But when you want to move image across the screen you must errase the first copies of immage on default rendertarget - that is the screen
try to think about possibility of clip animation - that will make your language more powerfull! In clip animation also you can make things like clip-clip collision, destortion, cycling and so on
ARNOLD, i'm sure you missed the basic rule of animation, the idea followed by fba, like the majority of graphic libs around, is to redraw the full scene inside onmainloop() event.
In other words, fba has all you need to write a full featured game.