Bug Fix: each tile of a large unit calculates hit direction as if they were smal

[Phezzan]

There is no 'REAR' on the front tile of a tank.

Edit: Fixed a crash if we hit a unit that doesn't exist.

Details:
BUG:
 A large unit takes up four tiles, but a hit calculates
 the position hit on a single tile and BattleUnit::damage assumes
 that each tile has every side, which is not true for a large unit.

FIX:
 Calculate the relative direction of the hit and then
 classify it as one of 8 cardinal directions.
 Then rotate it according to unit.direction.
 Since direction is relative to the center of the unit instead of the tile,
 large units work fine.

Notes:
 I think I might have gotten the Z calculation correct for body parts.
 I'm still terrible at using git and making patches.

[Warboy1982]

yeah i prefer pull requests, especially since i can easily see if they've been updated.

[Phezzan]

I'll be reading some more git tutorials then 

Currently I work in a branch (local/Kmod -> origin/Kmod)
master is untouched so that... well I'm not sure why...

Anyway, I need to learn the magic sauce for smoothly applying a modded branch's commit to a fresh remote branch.

git is interesting.

On a somewhat separate topic, is anyone working on the AI, and if not, can anyone explain the basic design?
It's been a long time since college, but if I can make them a bit more aggressive (and pick up weapons after they wake up) I'll be very pleased with myself.

[54x]

The not-picking-up-weapons is a deliberate compromise, as this is original game behaviour.

However, it actually only needs a change to some data values in the ruleset to make this happen. I've attached a ruleset I made that does this, although of course you'll need to remove the extra .txt extension, as the board currently doesn't allow you to attach .rul files.

[Warboy1982]

i can explain to you in detail how the AI works, but it'd be a long document, save me some typing and ask some more direct questions

[Phezzan]

ok - but I'll do that in a proper thread.

Thanks 54x - your dataFile got me looking in the right direction...
I merged it with my own, but either I made a mistake or it wasn't very proactive.
So I grepped 'attractive' until I found the right functions in BattlescapeGame.cpp.

Then I had to take some remedial C++ as I broke it.
I learned the best way to modify a vector item by item is:
 create a vector as a local
 push in the stuff you want to keep (Chryssalid Weapon, etc)
 swap with _inventory when you're done.

Other solutions tend to be crashtastic !

Regardless, I now have Chryssalids waking up and killing me, along with panicking leaders and anything that wasn't properly slaughtered.
(I modded in regeneration, and increased the bonus stun damage - waking up is pretty common for Chryssalids)