CoronaSDK-实现游戏计时器的毫秒计数

问题描述

我正在使用timer.performWithDelay来计时玩家完成一个关卡所需的时间.我希望它可以精确到100秒(因为游戏是多人游戏，并且我不希望领带过多).

I am using timer.performWithDelay to time how long it takes a player to complete a level. I want it to measure down to the 100th of a second (because the game is multiplayer, and I don't want there to be too many ties).

这是我所做的:

local totaltime = 0

local function counter()
    totaltime = totaltime + 0.01
    print(totaltime)
end

timer1 = timer.performWithDelay( 10, counter, 0)

它导致每个秒"持续约4秒.这是不切实际的还是某个地方存在缺陷?

It results in each "second" lasting about 4 seconds. Is this just not practical or is there a flaw somewhere?

推荐答案

为timer.preformWithDelay设置的延迟时间短于帧之间的时间，计时器将等待直到输入下一帧来调用该函数.

When timer.preformWithDelay is given a time delay smaller then the time between your frames the timer will wait until the next frame is entered to call the function.

这意味着，如果您以30或60 fps的速度运行游戏，则帧毫秒"约为16或33ms.因此，您可以设置的最小延迟是帧之间的延迟.

That means if you have a game running at 30 or 60 fps, you would have a 'frame ms' of about 16 or 33ms. So the minimum delay you can put is the delay between your frames.

在您的情况下，您希望每1/100秒或10毫秒设置一次计时器.这意味着，由于您的帧最有可能是16ms(60fps)，因此，每记录10ms，您实际上要等待6ms.

In your case you want to set your timer every 1/100th of a second, or with 10ms. This means, since your frame is most likely 16ms (60fps), that every logged 10ms you are actually waiting an addional 6ms.

现在，如果您以100 FPS的速度运行并达到10毫秒，则可以解决此问题，但这是不推荐的.

Now you could solve this if you ran with 100 FPS and thus achieved said 10 ms, but this is NOT recommendable.

AlanPlantPot为 coronaLabs :

AlanPlantPot provided the answer for following solution on coronaLabs:

local prevFrameTime, currentFrameTime --both nil
local deltaFrameTime = 0
local totalTime = 0

local txt_counter = display.newText( totalTime, 0, 0, native.systemFont, 50 )
txt_counter.x = 150
txt_counter.y = 288
txt_counter:setTextColor( 255, 255, 255 )
group:insert( txt_counter )

和

local function enterFrame(e)
     local currentFrameTime = system.getTimer()

    --if this is still nil, then it is the first frame
    --so no need to perform calculation
    if prevFrameTime then
        --calculate how many milliseconds since last frame
        deltaFrameTime = currentFrameTime - prevFrameTime
     end
    prevFrameTime = currentFrameTime
    --this is the total time in milliseconds
    totalTime = totalTime + deltaFrameTime

    --multiply by 0.001 to get time in seconds
    txt_counter.text = totalTime * 0.001
end

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