so im checking out the SpaceInvaders tutorial found here:
http://www.cokeandcode.com/node/6
im trying to wrap my head around why you need to know the last loop time to calculate movement? i would think that you would just need to look at the current position and increment that x-axis and/or y-axis by .01, 1, 30 or whatever needed for each loop.
below are a few snippets of the code listed in the above link: