Lua位移校验：坐标跳跃的阈值判定

local function move(actor, x, y)
    setplayvar(actor, "X", x)       -- 直接采信坐标，可瞬移
    setplayvar(actor, "Y", y)
end

local MAX_STEP = 50
local function move(actor, x, y, lastX, lastY)
    local dx, dy = x - lastX, y - lastY
    if math.sqrt(dx * dx + dy * dy) > MAX_STEP then
        setplayvar(actor, "X", lastX)
        setplayvar(actor, "Y", lastY)
        sendmsg(actor, 1, "位移异常，已回退")
        return false
    end
    setplayvar(actor, "X", x)
    setplayvar(actor, "Y", y)
    return true
end