【进阶实战】伏击陷阱：区域伏击的触发与解除封装

local traps = {}
local function placeTrap(actor, x, y)
    traps[#traps + 1] = { x = x, y = y,
        owner = getplayvar(actor, 0, "ShowName"),
        untilTs = os.time() + 1800 }
    takeitem(actor, "绊马索", 1, 0, "布置伏击")
    sendmsg(actor, 1, "伏击点已布置，持续 30 分钟。")
end

local function checkTrap(x, y)
    for i = #traps, 1, -1 do
        local t = traps[i]
        if math.abs(t.x - x) <= 1 and math.abs(t.y - y) <= 1
            and os.time() < t.untilTs then
            table.remove(traps, i)
            return t
        end
    end
    return nil
end