【网络通信】状态同步：移动插值与位置校验

---移动插值：两包之间匀速补齐
function Interp.onMove(id, x, y)
    local a = Interp.actors[id]
    if not a then
        Interp.actors[id] = { x = x, y = y, tx = x, ty = y }
        return
    end
    a.fx, a.fy = a.x, a.y          -- 插值起点
    a.tx, a.ty = x, y              -- 插值终点
    a.t0 = os.clock()
end

function Interp.tick()
    local now = os.clock()
    for _, a in pairs(Interp.actors) do
        if a.t0 then
            local k = math.min((now - a.t0) / 0.1, 1)
            a.x = a.fx + (a.tx - a.fx) * k
            a.y = a.fy + (a.ty - a.fy) * k
        end
    end
end

---移动包的服务端校验：速度上限
local MAX_SPEED = 6.5   -- 格/秒，含容差
function MoveCheck.validate(actor, nx, ny)
    local dt = os.time() - (actor.lastMoveAt or os.time())
    if dt <= 0 then dt = 1 end
    local dx, dy = nx - actor.x, ny - actor.y
    local dist = math.sqrt(dx * dx + dy * dy)
    if dist > MAX_SPEED * dt then
        sendmsg(actor, 1, "位置已校正")
        return actor.x, actor.y
    end
    actor.lastMoveAt = os.time()
    actor.x, actor.y = nx, ny
    return nx, ny
end