AS3：有多准确的getTimer（）方法和Timer类？有多、准确、方法、getTimer

2023-09-08 11:05:23 作者：剧情再美ヽ终究是戏

我在做一个游戏（一shmup）的过程中，我已经开始质疑在ActionScript定时器的准确性。当然，他们是不够准确，当你想不想来一次的东西几秒钟或deciseconds的量级，但它似乎不佳执行pretty的，当你到更精细的范围。这使得它pretty的很难做的事情一样有一个飞船发射每秒一百激光器。

I'm in the process of making a game (a shmup) and I've started to question the accuracy of the timers in ActionScript. Sure, they're accurate enough when you want to time things on the order of a few seconds or deciseconds, but it seems to perform pretty poorly when you get to finer ranges. This makes it pretty tough to do things like have a spaceship firing a hundred lasers per second.

在下面的示例，我测试的间隔时间有多长（平均）分别在1000计时器滴答用于30毫秒。一次又一次，结果是〜35-36ms。减少的时候，我发现地板上的计时器延迟是〜16-17ms。这给了我〜60最大的FPS，这是伟大的视觉，也意味着我不可能解雇每秒:-( 60多个激光器。我跑这个测试了几次，在100和1000环，但无论是。30ms的测试和1ms的测试结果并没有改变我打印到TextField在最后，因为使用trace（）和启动SWF在调试模式似乎在测试产生消极影响那么是什么我不知道的是：

In the following sample, I tested how long (on average) the intervals were between 1000 timer ticks intended for 30ms. Time and time again, the results are ~35-36ms. Decreasing the time, I found the floor on the timer delay to be ~16-17ms. This gives me a max fps of ~60, which is great visually but also means I can't possibly fire more than 60 lasers per second :-(. I ran this test a few times at 100 and 1000 loops, but for both the 30ms test and the 1ms test the results didn't change. I print to a textField at the end because using trace() and launching the swf in debug mode seems to negatively affect the test. So what I'm wondering is:

这是测试的定时器类的性能体面的措施，或者是我的成绩有疑问？在将这些成果显着其他机器上的变化？

据我所知，这是取决于中的getTimer（）方法的准确度，但讨论，我觉得对这个话题通常围绕的getTimer（）的精度中心在更大的区间。

I understand this is dependent on the getTimer() method's accuracy, but the discussions I find on this topic usually center around getTimer()'s accuracy on larger intervals.

package 
{   
    import flash.display.Sprite;
    import flash.events.TimerEvent;
    import flash.text.TextField;
    import flash.utils.getTimer;
    import flash.utils.Timer;

public class testTimerClass extends Sprite
{
	private var testTimer:Timer = new Timer(30, 1000);
	private var testTimes:Array = new Array();
	private var testSum:int = 0;
	private var testAvg:Number;
	private var lastTime:int;
	private var thisTime:int;

	public function testTimerClass()
	{
		testTimer.addEventListener(TimerEvent.TIMER, step);
		testTimer.addEventListener(TimerEvent.TIMER_COMPLETE, printResults);
		lastTime = getTimer();
		testTimer.start();
	}

	private function step(event:TimerEvent):void
	{
		thisTime = getTimer();
		testTimes.push(thisTime - lastTime);
		lastTime = thisTime;
	}

	private function printResults(event:TimerEvent):void
	{
		while (testTimes.length > 0)
		{
			testSum += testTimes.pop();
		}
		testAvg = testSum / Number(testTimer.repeatCount);				
		var txtTestResults:TextField = new TextField();
		txtTestResults.text = testAvg.toString();
		this.addChild(txtTestResults);	
	}		
}

}

我想取是只绘制多个激光器在同一帧不同的位置，并避免多个Timer对象的最佳途径。

I guess the best route to take would be to just draw multiple lasers in the same frame with different positions and avoid having more than one Timer object.

编辑：我用stage.frameRate改变渲染帧率和运行测试在几个帧速率，但并没有改变

edit: I used stage.frameRate to change the render frameRate and ran the test on several framerates but there was no change.

AS3：有多准确的getTimer（）方法和Timer类？有多、准确、方法、getTimer

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