【安全加密】加速外挂识别：移动轨迹的速度画像

---跑步触发
function run(actor, x, y)
    local rec = speedProfile[actor:GetUserId()]
    if not rec then
        rec = { samples = {}, sum = 0, count = 0 }
        speedProfile[actor:GetUserId()] = rec
    end
    local last = rec.last
    if last then
        local dist = math.sqrt((x - last.x) ^ 2 + (y - last.y) ^ 2)
        local dt = os.time() - last.t
        if dt >= 1 then
            rec.sum = rec.sum + dist / dt
            rec.count = rec.count + 1
            rec.last = { x = x, y = y, t = os.time() }
        end
    else
        rec.last = { x = x, y = y, t = os.time() }
    end
end

function SpeedProfile.judge(userId)
    local rec = speedProfile[userId]
    if not rec or rec.count < 60 then return false end
    local avg = rec.sum / rec.count
    -- 常规跑速约 4 格每秒，加速外挂稳定在 8 格以上
    if avg > 6.5 then
        QF_AlarmSpeed(userId, avg)
        return true
    end
    return false
end