[as3]as3实现屏幕切换震动的效果 as3屏幕

[as3]as3实现屏幕切换震动的效果 as3屏幕

package tools { 
    import flash.display.DisplayObject; 
    import flash.events.TimerEvent; 
    import flash.utils.Timer;    
  
    public class Earthquake { 
       /** 
        * 参数 
        */ 
        private var _timer:Timer; 
        private var _displayObject:DisplayObject; 
        private var _originalX:int; 
        private var _originalY:int; 
        private var _intensity:int; 
        private var _intensityOffset:int; 
        /** 
         * 时间 
         */ 
        private var _seconds:Number; 
        /** 
         * 方向 
         */ 
        public static const LEFT_RIGHT_UP_DOWN:int = 0; 
        public static const LEFT_RIGHT:int = 1; 
        public static const UP_DOWN:int = 2; 
        /** 
         * 帧频 
         */ 
        public static const FRAME_RATE:int = 60; 
        /** 
         * 方向 
         */ 
        private var _direction:int; 
        /** 
         * 震动中 
         */ 
        private var _bShaking:Boolean = false; 
        /** 
         * 是否自动销毁 
         */ 
        private var _bDestroy:Boolean = false; 
          
         /** 
          * 对一个显示对象应用地震效果。 
          * @param  displayObject 抖动对象 
          * @param  intensity 强度 
          * @param  seconds 持续时间 秒 
          * @param  direction 方向 
          * @param  autoDestroy 自动销毁 
          */ 
        public function Earthquake(displayObject:DisplayObject, intensity:Number = 10, seconds:Number = 1, direction:int = 0, autoDestroy:Boolean = false):void 
        { 
            _displayObject = displayObject; 
            _originalX = displayObject.x; 
            _originalY = displayObject.y; 
            _intensity = intensity; 
            _intensityOffset = intensity / 2; 
            _seconds = seconds; 
            _direction = direction; 
            _bDestroy = autoDestroy; 
        } 
        /** 
         * 开始后抖动 
         */ 
        public function go():void 
        { 
            if (_bShaking) return; 
            _bShaking = true; 
            var msPerUpdate:int = int(1000 / FRAME_RATE); 
            var totalUpdates:int = int(_seconds * 1000 / msPerUpdate); 
              
            if (!_timer) 
            { 
                _timer = new Timer(msPerUpdate, totalUpdates); 
                _timer.addEventListener(TimerEvent.TIMER, quake); 
                _timer.addEventListener(TimerEvent.TIMER_COMPLETE, resetImage); 
            } 
            else 
            { 
                _displayObject.x = _originalX; 
                _displayObject.y = _originalY; 
                _timer.reset(); 
            } 
            _timer.start(); 
        } 
        /** 
         * 抖动 
         * @param   event 
         */ 
        private function quake( event:TimerEvent ):void 
        { 
            var newX:int = _originalX; 
            var newY:int = _originalY; 
              
            switch(_direction) 
            { 
                case LEFT_RIGHT_UP_DOWN: 
                    newX = _originalX + Math.random() * _intensity - _intensityOffset; 
                    newY = _originalY + Math.random() * _intensity - _intensityOffset; 
                    break; 
                case LEFT_RIGHT: 
                    newX = _originalX + Math.random() * _intensity - _intensityOffset; 
                    break; 
                case UP_DOWN: 
                    newY = _originalY + Math.random() * _intensity - _intensityOffset; 
                    break; 
            } 
            _displayObject.x = newX; 
            _displayObject.y = newY; 
        } 
        /** 
         * 重置 
         * @param   event 
         */ 
        private function resetImage( event:TimerEvent = null ):void 
        { 
            _displayObject.x = _originalX; 
            _displayObject.y = _originalY; 
            cleanup(); 
        } 
        /** 
         * 清除 
         */ 
        private function cleanup():void 
        { 
            _bShaking = false; 
            /*_timer = null; 
            _timer.stop();*/ 
            _timer.reset(); 
            if (_bDestroy) 
            { 
                _timer.removeEventListener(TimerEvent.TIMER, quake); 
                _timer.removeEventListener(TimerEvent.TIMER_COMPLETE, resetImage); 
                _timer = null; 
                _displayObject = null; 
            } 
            delete [this]; 
            //_displayObject = null; 
        } 
    } 
} 

[as3]as3实现屏幕切换震动的效果 as3屏幕