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更新6 :
Fenomenas建议我尽可能简单地重新创建所有内容。我对此表示怀疑,因为算法保持不变,并且性能似乎不是问题,这会产生什么不同。无论如何,这是我得到的唯一建议,所以这里是:
package {
import flash.display.Sprite;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.utils.getTimer;
[SWF(width="800", height="600", frameRate="40", backgroundColor="#000000")]
public class SimpleMovement extends Sprite
{
private static const TURNING_SPEED:uint = 180;
private static const MOVEMENT_SPEED:uint = 400;
private static const RADIAN_DIVIDE:Number = Math.PI/180;
private var playerObject:Sprite;
private var shipContainer:Sprite;
private var moving:Boolean = false;
private var turningMode:uint = 0;
private var movementTimestamp:Number = getTimer();
private var turningTimestamp:Number = movementTimestamp;
public function SimpleMovement()
{
//step 1: create player object
playerObject = new Sprite();
playerObject.graphics.lineStyle(1, 0x000000);
playerObject.graphics.beginFill(0x6D7B8D);
playerObject.graphics.drawRect(0, 0, 25, 50);
//make it rotate around the center
playerObject.x = 0 - playerObject.width / 2;
playerObject.y = 0 - playerObject.height / 2;
shipContainer = new Sprite();
shipContainer.addChild(playerObject);
shipContainer.x = 100;
shipContainer.y = 100;
shipContainer.rotation = 180;
addChild(shipContainer);
//step 2: install keyboard hook when stage is ready
addEventListener(Event.ADDED_TO_STAGE, stageReady, false, 0, true);
//step 3: install rendering update poll
addEventListener(Event.ENTER_FRAME, updatePoller, false, 0, true);
}
private function updatePoller(event:Event):void
{
var newTime:Number = getTimer();
//turning
if (turningMode != 0)
{
var turningDeltaTime:Number = newTime - turningTimestamp;
turningTimestamp = newTime;
var rotation:Number = TURNING_SPEED * turningDeltaTime / 1000;
if (turningMode == 1) shipContainer.rotation -= rotation;
else shipContainer.rotation += rotation;
}
//movement
if (moving)
{
var movementDeltaTime:Number = newTime - movementTimestamp;
movementTimestamp = newTime;
var distance:Number = MOVEMENT_SPEED * movementDeltaTime / 1000;
var rAngle:Number = shipContainer.rotation * RADIAN_DIVIDE; //convert degrees to radian
shipContainer.x += distance * Math.sin(rAngle);
shipContainer.y -= distance * Math.cos(rAngle);
}
}
private function stageReady(event:Event):void
{
//install keyboard hook
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown, false, 0, true);
stage.addEventListener(KeyboardEvent.KEY_UP, keyUp, false, 0, true);
}
private final function keyDown(event:KeyboardEvent):void
{
if ((event.keyCode == 87) && (!moving)) //87 = W
{
movementTimestamp = getTimer();
moving = true;
}
if ((event.keyCode == 65) && (turningMode != 1)) //65 = A
{
turningTimestamp = getTimer();
turningMode = 1;
}
else if ((event.keyCode == 68) && (turningMode != 2)) //68 = D
{
turningTimestamp = getTimer();
turningMode = 2;
}
}
private final function keyUp(event:KeyboardEvent):void
{
if ((event.keyCode == 87) && (moving)) moving = false; //87 = W
if (((event.keyCode == 65) || (event.keyCode == 68)) && (turningMode != 0)) turningMode = 0; //65 = A, 68 = D
}
}
}
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ships[id] = new GameShip();
ships[id].setMovementMode(1); //move forward
addEventListener(Event.ENTER_FRAME, movementHandler);
private final function movementHandler(event:Event):void
{
var newTimeStamp:uint = UtilLib.getTimeStamp(); //set current timeStamp
var distance:Number = (newTimeStamp - movementTimeStamp) / 1000 * movementSpeed; //speed = x pixels forward every 1 second
movementTimeStamp = newTimeStamp; //update old timeStamp
var diagonalChange:Array = getDiagonalChange(movementAngle, distance); //the diagonal position update based on angle and distance
charX += diagonalChange[0];
charY += diagonalChange[1];
if (shipContainer)
{ //when the container is ready to be worked with
shipContainer.x = charX;
shipContainer.y = charY;
}
}
private final function getDiagonalChange(angle:Number, distance:Number):Array
{
var rAngle:Number = angle * Math.PI/180; //convert degrees to radian
return [Math.sin(rAngle) * distance, (Math.cos(rAngle) * distance) * -1];
}
最佳答案
我不知道这里是否有任何黄金答案,但是我有一些建议。
首先,我将不对优化Math.PI / 180等问题进行任何查询。通常较高的帧速率应明确表明,简单的计算不会降低任何速度。
其次,解决偶尔出现的显示延迟尖峰:在我看来,这很像垃圾收集器运行得非常频繁。在对您的代码进行非常简短的浏览后,我没有发现任何频繁出现GC的明显原因,但是我有两个建议。首先,如果您有权访问Flash IDE,我将尝试在不使用Flex框架的情况下重新创建您的项目。 Flash项目除包含您所输入的代码外不包含任何代码,但是Flex使用了很多自己的工具,这可能并不总是很明显,并且您的代码与框架之间的某些交互可能会导致GC。
如果那没有帮助,那么另一件事是尝试制作一个大大简化的代码版本(如果可能的话,在Flash中),希望它足够简单而不触发相同的峰值。我的意思是,例如,附着在图形上的单个类仅具有一个用于键事件的侦听器和一个用于帧(或计时器)事件的第二侦听器,在该侦听器中未创建任何变量。如果最低版本没有显示这些峰值,那么应该有可能在那个版本和您的完整客户端之间进行三角测量,以找出导致峰值的原因。
最后,关于一般的平滑度,我唯一的评论是Flash的屏幕更新本质上有些不均匀,实际上,您只有两种方法可用。您可以根据帧更新来移动actor,这会使它们的移动随帧率的变化而稍微不均匀,或者根据经过的时间对其进行移动,这会使它们的整体移动变得平滑(以每秒像素为单位),但它们的显示会稍微不均匀(以移动像素为单位)每帧)。较高的FPS会放大差异。
另外,请务必记住,Flash进行更新后,它们在屏幕上的显示方式会受到视频卡的严重影响。尤其是您会发现,在一种环境中,剪切和垂直同步问题可能非常明显,而在另一种环境中却没有。开发人员没有真正的解决办法,除非通常避免播放非常高FPS的动画,并尽可能降低总体处理器负担。
编辑:有关帧更新定时“天生不平衡”的更多信息,请参阅this blog post。屏幕更新之间的延迟介于12-16ms之间,您无能为力。这是因为操作系统和浏览器会影响Flash计时工作方式的事实。 (即使在一部空电影中,您也会看到这种东西,这就是为什么该主题中有关优化数学等的许多评论不会对您有所帮助的原因。)您无法避免这种变化,但是正如我如上所述,您可以定制视觉效果来唤起您想要的效果。无论哪种方式,我认为峰值都值得担心。您正在查看的变化是微妙的,在有很多东西在进行的游戏中将很难注意到,但是尖峰令人震惊。
编辑2
您问:“您真的认为那些流畅的游戏使用与我相同的移动算法吗?”
答案是,我认为他们在做简单得多的事情。他们几乎可以肯定正在执行以下一项操作:
function onEnterFrame() { // move at a constant speed per frame
ship.angle += dtheta;
ship.x += speed * Math.cos( ship.angle );
ship.y += speed * Math.sin( ship.angle );
}
function onEnterFrame2() { // move at a constant speed per second
var dt:Number = getTimeSinceLastFrame();
ship.angle += anglePerSecond * dt/1000;
var dist:Number = speedPerSecond * dt/1000;
ship.x += dist * Math.cos( ship.angle );
ship.y += dist * Math.sin( ship.angle );
}
dt
限制为理想帧(1 / fps)的持续时间的最多2或3倍。
关于actionscript-3 - 优化2D Flash游戏的过渡/运动平滑度,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1284886/
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