AS3 CookBook学习整理(一)

1. 我要改变swf的尺寸和颜色

在flex builder 3里，默认会生成一个全屏、背景色为#869CA7、帧数为24/秒的swf文件，要修改这些参数，只需要在类文件中定义 [SWF(width="800", height="600", backgroundColor="#ffffff", frameRate="31")]

 hxw
{flash.display.Sprite;[SWF(width=, height=, backgroundColor=, frameRate=)]ExampleApplicationSprite{ExampleApplication(){}}
}

2. 我要重复执行某段代码

在enterFrame事件中添加监听器和关联处理方法

 hxw
{flash.display.Sprite;flash.events.Event;Sample1009Sprite{Sample1009(){graphics.lineStyle(3,0xFF0000,1);addEventListener(Event.ENTER_FRAME,onEnterFrame);}onEnterFrame(event:Event):{graphics.lineTo(Math.random()*400,Math.random()*400);}}
}

3. 如何响应鼠标事件

为MouseEvent系列事件添加监听器和关联处理方法

 hxw
{flash.display.Sprite;flash.events.MouseEvent;[SWF(width=, height=, backgroundColor=, frameRate=)]Sample1010Sprite{_sprite:Sprite;Sample1010(){_sprite = Sprite();_sprite.graphics.beginFill(0x27496E);_sprite.graphics.drawRect(5,5,400,400);_sprite.graphics.endFill();_sprite.addEventListener(MouseEvent.MOUSE_DOWN,OnMouseDown);_sprite.addEventListener(MouseEvent.MOUSE_UP,OnMouseUp);.addChild(_sprite);}OnMouseDown(event:MouseEvent):{_sprite.graphics.lineStyle(1,0xFFFF00,1);_sprite.graphics.moveTo(mouseX,mouseY);_sprite.addEventListener(MouseEvent.MOUSE_MOVE,OnMouseMove);}OnMouseUp(event:MouseEvent):{_sprite.removeEventListener(MouseEvent.MOUSE_MOVE,OnMouseMove);}OnMouseMove(event:MouseEvent):{   _sprite.graphics.lineTo(mouseX,mouseY);}}
}

4. 如何响应键盘事件

为KeyboardEvent事件添加监听器和关联处理方法

 {flash.display.Sprite;flash.events.KeyboardEvent;Sample1030Sprite{Sample1030(){stage.addEventListener(KeyboardEvent.KEY_DOWN,OnKeyDown);}OnKeyDown(event:KeyboardEvent):{(event.charCode);}}
}

5. 如何实现定时器(Timer)

初始化一个Timer类，使用addEventListener来设置一个函数处理这个事件，然后使用timer的start( )方法启动或stop( )停止它。

 {flash.display.Sprite;flash.events.TimerEvent;flash.utils.Timer;Sample1101Sprite{_rect:Sprite;_circle:Sprite;Sample1101(){_rect = Sprite();_circle = Sprite();_rect.graphics.beginFill(0xFFFF00);_rect.graphics.drawRect(0,0,100,100);_rect.graphics.endFill();_rect.x = 50;_rect.y = 100;.addChild(_rect);_circle.graphics.beginFill(0x80C56E);_circle.graphics.drawCircle(0,0,50);_circle.graphics.endFill();_circle.x = 100;_circle.y = 200;.addChild(_circle);_timer:Timer = Timer(50);_timer.addEventListener(TimerEvent.TIMER,OnTimerTick);_timer.addEventListener(TimerEvent.TIMER,OnTimerTick2);_timer.start();}OnTimerTick(event:TimerEvent):{_rect.x += 20;}OnTimerTick2(event:TimerEvent):{_circle.y += 30;}}
}

6. 获得客户端的操作系统版本

ActionScript 3.0中，flash.system.Capabilities.os 属性返回操作系统名称和版本字符串。值可能包括Windows XP, Windows 2000, Windows NT, Windows 98/Me, Windows 95, 和Windows CE. 在苹果机上，字符串包括版本号，比如Mac OS 9.2.1 或Mac OS X 10.4.4

 {flash.display.Sprite;flash.system.Capabilities;Sample1101Sprite{Sample1101(){os:String = flash.system.Capabilities.os.substr(0,3);if (os == ) {}else if (os == ) {}else {}}}
}

7. 获得客户端的播放器类型

使用flash.system.Capabilities.playerType属性。它可能是PlugIn, ActiveX,StandAlone和External。

播放器的类型有：

浏览器插件形式存在于Mozilla 或Firefox

ActiveX 控件形式存在于Internet Explorer

独立播放器

外部播放器，它与Flash IDE进行交互

 {flash.display.Sprite;flash.system.Capabilities;Sample1101Sprite{Sample1101(){(flash.system.Capabilities.playerType == ){}else (flash.system.Capabilities.playerType == ){}else{}}}
}

8. 获得客户端的语言与输入法

使用flash.system.Capabilities.language 属性和flash.system.IME 类

 {flash.display.Sprite;flash.system.IME;Sample1101Sprite{Sample1101(){lang:String = flash.system.Capabilities.language.substr(0, 2);> supportedLanguages:Array = [, , ];useLang:String = ;for (i:int = 0; i < supportedLanguages.length; i++){if (supportedLanguages[i] == lang){useLang = lang;break;}}movieURL:String =  + useLang + ;}}
}

9. 获得客户端的分辨率

screenResolutionX 和screenResolutionY 属性返回桌面的显示分辨率：

trace(flash.system.Capabilities.screenResolutionX); // 1024

trace(flash.system.Capabilities.screenResolutionY); // 768

 {flash.display.Sprite;flash.external.ExternalInterface;flash.system.Capabilities;Sample1101Sprite{Sample1101(){screenX:int = flash.system.Capabilities.screenResolutionX;screenY:int = flash.system.Capabilities.screenResolutionY;winW:int = 200;winH:int = 200;winX:int = (screenX / 2) - (winW / 2);winY:int = (screenY / 2) - (winH / 2);jsCode:String =  ++ winW ++ winH +  ++ winX +  + winY + ;ExternalInterface.call(jsCode);}}
}

10. 缩放影片

设置stage.scaleMode，scaleMode属性值并不影响右键菜单里功能，不过你可以禁用菜单里的缩放功能。

stage.scaleMode的值来自flash.display.StageScaleMode类的枚举，有EXACT_FIT, NO_BORDER,NO_SCALE, 和SHOW_ALL

假设原影片如下：