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-- PlayerAreas.lua
-- Implements the cPlayerAreas class representing the per-player area storage object
--[[
Each player instance is expected to have a separate object of type cPlayerAreas.
Each object has an array of {cuboid, IsAllowed} tables, one for each area that is "within reach"
The code can then ask each object, whether the player can interact with a certain block or not.
A player can interact with a block if either one of these is true:
1, There are no areas covering the block
2, There is at least one area covering the block with IsAllowed set to true
The object also has a m_SafeCuboid object that specified the area within which the player may move
without the PlayerAreas needing a re-query.
Also, a global table g_PlayerAreas is the actual map of PlayerID -> cPlayerAreas
--]]
cPlayerAreas = {};
g_PlayerAreas = {};
function cPlayerAreas:new(a_SafeMinX, a_SafeMinZ, a_SafeMaxX, a_SafeMaxZ)
assert(a_SafeMinX);
assert(a_SafeMinZ);
assert(a_SafeMaxX);
assert(a_SafeMaxZ);
local obj = {};
setmetatable(obj, self);
self.__index = self;
self.m_SafeCuboid = cCuboid(a_SafeMinX, 0, a_SafeMinZ, a_SafeMaxX, 255, a_SafeMaxZ);
return obj;
end
-- Adds a new cuboid to the area list, where the player is either allowed or not, depending on the IsAllowed param
function cPlayerAreas:AddArea(a_Cuboid, a_IsAllowed)
table.insert(self, {m_Cuboid = a_Cuboid, m_IsAllowed = a_IsAllowed});
end
--- returns true if the player owning this object can interact with the specified block
function cPlayerAreas:CanInteractWithBlock(a_BlockX, a_BlockZ)
assert(self);
-- iterate through all the stored areas:
local IsInsideAnyArea = false;
for idx, Area in ipairs(self) do
if (Area.m_Cuboid:IsInside(a_BlockX, 1, a_BlockZ)) then -- We don't care about Y coords, so use a dummy value
if (Area.m_IsAllowed) then
return true;
end
-- The coords are inside a cuboid for which the player doesn't have access, take a note of it
IsInsideAnyArea = true;
end
end
if (IsInsideAnyArea) then
-- The specified coords are inside at least one area, but none of them allow the player to interact
return false;
end
-- The coords are not inside any area
-- TODO: Have a config saying whether a player can build in the non-areated space or not
return true;
end
--- Calls the specified callback for each area contained within
-- a_Callback has a signature: function(a_Cuboid, a_IsAllowed)
-- Returns true if all areas have been enumerated, false if the callback has aborted by returning true
function cPlayerAreas:ForEachArea(a_Callback)
assert(self);
for idx, Area in ipairs(self) do
if (a_Callback(Area.m_Cuboid, Area.m_IsAllowed)) then
return false;
end
end
return true;
end
--- Returns true if the player is withing the safe cuboid (no need to re-query the areas)
function cPlayerAreas:IsInSafe(a_BlockX, a_BlockZ)
assert(self);
return self.m_SafeCuboid:IsInside(a_BlockX, 0, a_BlockZ);
end
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