【性能调优】AOI九宫格增量同步：进出格事件的收敛广播

local GRID = 8
local function gridKey(x, y)
    return math.floor(x / GRID) * 1000 + math.floor(y / GRID)
end
local function aroundGrids(x, y)
    local gx, gy = math.floor(x / GRID), math.floor(y / GRID)
    local list = {}
    for i = -1, 1 do
        for j = -1, 1 do
            table.insert(list, (gx + i) * 1000 + (gy + j))
        end
    end
    return list
end

local lastGrid = {}
local function onMove(actor, x, y)
    local player = class(actor)
    local nk = gridKey(x, y)
    if lastGrid[player:GetName()] == nk then return end
    lastGrid[player:GetName()] = nk
    for _, gk in ipairs(aroundGrids(x, y)) do
        broadcastEnter(gk, player:GetName())
    end
end