Original idea behind options is that options should only be set on pathfinder object creation (or via some special method in case pathfinder become persistent).
This way it's more clear that it's pointer to object on tile and not path node.
It's important because air layer nodes don't have visitable objects while tile under them can have one.
TurnInfo contain information about what movement-related bonuses and MP hero going to have on certain turn.
This way we can collect this information once for each turn so it's huge performance boost.
Initially wanter to name main class differently and back then getCost make sense.
Then renamed class to CPathfinderHelper, but forgot to rename function back.
Now pathfinder take into account different bonuses for different tuns. So if you only have FLYING_MOVEMENT bonus from Fly spell for one turn then pathfinder will only let you use air layer within one turn only.
That work for cost calculations too. Let's say you have two bonuses:
- FLYING_MOVEMENT with 20% penalty for next 2 turns
- FLYING_MOVEMENT with 40% penalty for 5 turns
Now pathfinder using correct penalty for each turn so movements in air layer going to be more expensive on 3-5 turns.
Now when oneTurnSpecialLayersLimit is enabled hero won't be able to stop on blocked or water tiles between turns.
It's default H3 mechanics so it's enabled by default.
CTerrainRect::showPath behaviour changed so it's will only add cross path graphics on embark/disembark and path ending.
We want continuous paths for flying and water walking even when land<-> water transition occur.
No action going to simplify isMovementAfterDestPossible and should be as well useful for cost calculations.
It's can be also used by client interface to show appropriate cursors and path.
There is two exceptions:
- Hero start movement from guarded tile.
- Hero that embarking into boat that standing on guarded tile.
In other cases future movement is impossible.
It's should be possible to go into air layer from visitable object (but opposite isn't allowed).
And when walking on water player can't really interact with any object at all so future movement always possible.
This way we can avoid layer checks when calculating paths by ignoring unitialized tiles entirely.
Also at this point pathfinder and movement actually works for everything except flying.
This still need investigation, but likely most of external code shouldn't be aware of layers in order to work properly because only LAND and SAIL can be targeted and single tile can't have both of these layers.
