我尝试结合 Lee Brimlow 的 blitting 教程系列和 Rex Van der spuy 的“带有 Flash 的高级游戏设计”中的技术
我是一名开发人员，致力于在 Flash 中制作的网络在线虚拟世界。我做了一个电话应用程序（类似于侠盗猎车手游戏中的电话）。无论如何，当发送消息时，我们想要播放一个信封飞来飞去并在其周围闪闪发光的疯狂动画。它很滞后（尤其是在较旧的计算机上），所以我认为这将是一个使用 blitting 的好机会。然而，blitting 动画实际上比普通的movieclip 慢！！这到底是怎么回事？blitting 是否只对移动设备更好，而在计算机上实际上更慢？也许我做错了什么。这是我的代码：
// 这部分发生在电话初始化时
//**
//---------------- Blitting stuff ----------------------------------
// add this bitmap stage to the display list so we can see it
_bitmapStage = new BitmapData(550, 400, true, 0xD6D6D6);
_phoneItself.addChild(new Bitmap(_bitmapStage));
var _spritesheetClass:Class = getDefinitionByName("ESpritesheet_1") as Class;
_spritesheet = new _spritesheetClass() as BitmapData;
_envelopeBlit = new BlitSprite(_spritesheet, BlitConfig.envelopeAnimAry , _bitmapStage);
_envelopeBlit.x = -100;
_envelopeBlit.y = 0;
_envelopePlayTimer = new Timer(5, 0);
_envelopePlayTimer.addEventListener(TimerEvent.TIMER, onEnterTimerFrame);
_envelopeBlit.addEventListener("ENV_ANIM_DONE", onEnvAnimFinished);
// “BlitSprite”是我创建的一个类。它看起来像这样：
package com.fs.util_j.blit_utils
{
import flash.display.BitmapData;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.geom.Point;
import flash.geom.Rectangle;
public class BlitSprite extends EventDispatcher
{
private var _fullSpriteSheet:BitmapData;
private var _rects:Array;
private var _bitmapStage:BitmapData;
private var pos:Point = new Point ();
public var x:Number = 0;
public var y:Number = 0;
public var _animIndex:
整数 = 0; 私有变量_count：int = 0；
public var animate:Boolean = true;
private var _whiteTransparent:BitmapData;
private var _envelopeAnimAry:Array;
private var _model:Object;
public function BlitSprite(fullSpriteSheet:BitmapData, envelopeAnimAry:Array, bitmapStage:BitmapData, model:Object = null)
{
_fullSpriteSheet = fullSpriteSheet;
_envelopeAnimAry = envelopeAnimAry;
_bitmapStage = bitmapStage;
_model= model;
init();
}
private function init():void
{
// _whiteTransparent = new BitmapData(100, 100, true, 0x80FFffFF);
this.addEventListener("ENV_ANIM_DONE", onEvnAnimDone);
}
protected function onEvnAnimDone(event:Event):void
{
}
public function render():void
{
// pos.x = x - _rects[_animIndex].width*.5;
// pos.y = y - _rects[_animIndex].width*.5;
// if (_count % 1 == 0 && animate == true)
// {
// trace("rendering");
if (_animIndex == (_envelopeAnimAry.length - 1) )
{
// _animIndex = 0;
dispatchEvent(new Event("ENV_ANIM_DONE", true));
animate = false;
// trace("!!!!animate over " + _model.animOver);
// if (_model != null)
// {
// _model.animOver = true;
// }
// trace("!!!!animate over " + _model.animOver);
}
else
{
_animIndex++;
}
pos.x = x + _envelopeAnimAry[_animIndex][1];
pos.y = y + _envelopeAnimAry[_animIndex][2];
_bitmapStage.copyPixels(_fullSpriteSheet, _envelopeAnimAry[_animIndex][0], pos, null, null, true);
}
}
}
// THIS PART HAPPENS WHEN PHONE'S SEND BUTTON IS CLICKED
_envelopeBlit.animate = true;
_envelopeBlit._animIndex = 0;
_darkSquare.visible = true;
_envelopePlayTimer.addEventListener(TimerEvent.TIMER, onEnterTimerFrame);
_envelopePlayTimer.start();
它还使用 BlitConfig 存储有关由 TexturePacker 吐出的 spritesheet 的信息
package com.fs.pack.phone.configuration
{
import flash.geom.Rectangle;
public final class BlitConfig
{
public static var _sending_message_real_20001:Rectangle = new Rectangle(300,1020,144,102);
public static var _sending_message_real_20002:Rectangle = new Rectangle(452,1012,144,102);
public static var _sending_message_real_20003:Rectangle = new Rectangle(852,852,146,102);
public static var _sending_message_real_20004:Rectangle = new Rectangle(2,1018,146,102);
public static var _sending_message_real_20005:Rectangle = new Rectangle(702,822,148,102);
.
.
.
public static var _sending_message_real_20139:Rectangle = new Rectangle(932,144,1,1);
public static var envelopeAnimAry:Array = [
// rectangle, x offset, y offset
[ _sending_message_real_20001, 184,155],
[ _sending_message_real_20002, 184,155],
[ _sending_message_real_20003, 183,155],
[ _sending_message_real_20004, 183,155],
.
.
.
[ _sending_message_real_20139, 0,0]
]
public function BlitConfig()
{
}
}
}