[AS3]AS3.0键盘控制(键盘控制代码示例)(2)

package   
{  
        import flash.display.Sprite;  
        import flash.display.Stage;  
        import flash.events.Event;  
        import flash.events.KeyboardEvent;  
        /**  
         * ...  
         * @author   
         */  
        public class Control extends Sprite  
        {  
                private static var code:uint;  
                private static var KeyAry:Array = new Array();  
                  
                public static function init(stage:Stage):void   
                {  
                        stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);  
                        stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);  
                }  
                  
                  
                private static function onKeyDown(evt:KeyboardEvent):void  
                {  
                        code = evt.keyCode;  
                        trace("按下了" + code);  
                        KeyAry[code] = true;  
                }  
                  
                  
                private static function onKeyUp(evt:KeyboardEvent) :void  
                {  
                        KeyAry[evt.keyCode] = [];  
                }  
                  
                  
                public static function isDown(KeyCode:uint):Boolean  
                {  
                        return KeyAry[KeyCode] == true;  
                }  
        }  
          
} 

　　全场都是静态函数。稍微分析一下吧。声明了code，uint类型（其实这个可有可无），和KeyAry数组（我承认这样的命名很抽。。。）
　　当键盘按下时，KeyAry数组的第键盘码个元素（= =）就被赋值为true，然后在isDown处返回那个元素是否为true。
　　在另一边，角色就得到那个元素是否为true了。
代码如下。

package  
{  
        import flash.display.Graphics;  
        import flash.display.Shape;  
        import flash.display.Sprite;  
        import flash.events.Event;  
          
        public class rectObj extends Sprite  
        {  
                private var rect:Shape = new Shape();  
                public function rectObj()  
                {  
                        drawRect();  
                        addChild(rect);  
                        this.addEventListener(Event.ENTER_FRAME,EnterFrameHandler);  
                }  
                private function drawRect():void  
                {  
                        var g:Graphics = rect.graphics;  
                        g.beginFill(0xFF0000);  
                        g.drawRect(0,0,50,50);  
                        g.endFill();  
                }  
                public function EnterFrameHandler(evt:Event):void  
                {  
                        //w-87,s-83,a-65,d-68  
                        if(Control.isDown(87)) rect.y -= 5;  
                        if(Control.isDown(83)) rect.y += 5;  
                        if(Control.isDown(65)) rect.x -= 5;  
                        if(Control.isDown(68)) rect.x +=5;  
                }  
        }  
} 

　　在EnterFrame里判断键盘是否被按下。不断调用Control类的isDown函数返回。
　　这样，一个比较满意的键盘控制类就完成了。可以八方向行走，同时按多个键的判断，不会出现停顿。