【策划架构】Lua九宫格AOI：祖玛教主同屏目标的网格索引

local function targets(actor)
    local out = {}
    for _, u in pairs(UNITS) do   -- 全场景2000个逐个算距离
        if near(u) then out[#out + 1] = u end
    end
    return out
end

local GRID = {}
local function cellOf(x, y)
    return math.floor(x / 200) .. "_" .. math.floor(y / 200)
end
local function enter(u, x, y)
    local c = cellOf(x, y)
    GRID[c] = GRID[c] or {}
    GRID[c][#GRID[c] + 1] = u     -- 坐标映射入格
    u.cell = c
end
sendmsg(actor, 1, "祖玛教主所在格 " .. cellOf(300, 500))