[bartread]

Thanks - that might be interesting. See my comment above but, yes, I'd quite like to avoid implementing those primitives. I could get round it by drawing one image, and then processing the bytes for the rotations, but:

- This might lead to the odd jaggy artifact because I'm rotating bitmaps rather than vectors,

- It might not speed things up that much because I still need to create images from these arrays,

- It starts to seem like quite a lot of work; maybe I'd be better off reducing the number of images slightly, and compensating by speeding up the minimum angular velocity.

You can see what I'm up against at https://arcade.ly/games/asteroids/. (Also, see my comment above, where I've made substantially the same points.)