【进阶实战】哨戒信标：警戒区域的联动报警封装

local beacons = {}
local function deployBeacon(actor, x, y)
    beacons[#beacons + 1] = { x = x, y = y,
        owner = getplayvar(actor, 0, "ShowName") }
    sendmsg(actor, 1, "信标部署完成，覆盖 10 格。")
end

local function alertNearest(x, y, intruder)
    local best, bestDist = nil, math.huge
    for _, b in ipairs(beacons) do
        local d = math.abs(b.x - x) + math.abs(b.y - y)
        if d < bestDist then
            best, bestDist = b, d
        end
    end
    if best and bestDist <= 10 then
        local owner = getplayerbyname(best.owner)
        if owner then
            sendmsg(owner, 1, "信标报警：(" .. x .. "," .. y
                .. ") 发现入侵者。")
        end
    end
end