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I've made some games on a number of different platforms and I end up with what I'm going to call, "offset hell".

I have several things. I have a multi-screen map, a viewing window on that map (the "camera"), a player sprite, some enemy sprites, some "bullets". Some things are described in "cells" (ie the screen is 30x17 cells, a sprite is one cell in size). Some things are described in pixels (ie the screen is 240x136 pixels, a sprite is 8x8).

And I have to:

• Figure out which bit of map to show on the screen

• Where each sprite is on the screen based on it's map position

• Decides if a player or enemy has

* Hit a wall * Is Standing on anything * Has hit another sprite * Has been hit by a bullet

There just seems to be too many unit conversions and offset calculating. And I spend so much time just calculating this that I get bogged down and give up.

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