Bombs that hit the edge don't explode

[samm81]

[alanhdu]

ecab147 should fix

[samm81]

Still having some problems. Perhaps if you can't see the whole thing it doesn't render any part of it?

[alanhdu]

Hm... This looks to be pretty tricky.

The problem is how we manage updates. Essentially, for every screen update, we actually move two steps forward in time. What's happening here is that the bomb's exploding on the first time step, and the second time step is clearing away the explosion.

One possible solution is to only move forward one time step for every screen update. But that would require us to double the refresh rate to keep the game from feeling sluggish. And when we double the refresh rate, explosions would only stay on the screen for 0.02 seconds, which would probably be near-impossible to see.

The other (IMO nicer) solution, is to just keep explosions on the screen for the second update. We'd also leave a rule that anything moving into an explosion takes damage (e.g. a bullet hitting an explosion disappears).