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-module(btl_movement).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-export([cross/4]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec cross
(
btl_map:type(),
list(btl_location:type()),
list(btl_direction:enum()),
non_neg_integer(),
btl_location:type()
)
-> {btl_location:type(), non_neg_integer()}.
cross (_Map, _ForbiddenLocations, [], Cost, Location) ->
{Location, Cost};
cross (Map, ForbiddenLocations, [Step|NextSteps], Cost, Location) ->
NextLocation = btl_location:apply_direction(Step, Location),
NextTileID = btl_map:get_tile_id(NextLocation, Map),
NextTileClassID = btl_tile:extract_main_class_id(NextTileID),
NextTile = btl_tile:from_class_id(NextTileClassID),
NextCost = (Cost + btl_tile:get_cost(NextTile)),
IsForbidden =
lists:foldl
(
fun (ForbiddenLocation, Prev) ->
(Prev or (NextLocation == ForbiddenLocation))
end,
false,
ForbiddenLocations
),
IsForbidden = false,
cross(Map, ForbiddenLocations, NextSteps, NextCost, NextLocation).
-spec cross
(
btl_map:type(),
list(btl_location:type()),
list(btl_direction:enum()),
btl_location:type()
)
-> {btl_location:type(), non_neg_integer()}.
cross (Map, ForbiddenLocations, Path, Location) ->
cross(Map, ForbiddenLocations, Path, 0, Location).
|
