检测FPS和内存占用

转自：http://as3blog.com/as3/fps-memory-leak-monitor-of-as3/

使用：

var monitor:MonitorKit = new MonitorKit(MonitorKit.MKMODE_T);
addChild(monitor);

MonitorKit类：

package com.as3blog.utils
{
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.events.Event;
    import flash.system.System;
    import flash.text.TextField;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextFormat;
    import flash.utils.getTimer;

    public class MonitorKit extends Sprite
    {
        public static const MKMODE_T:String = "MKMODE_T";
        public static const MKMODE_B:String = "MKMODE_B";
        public static const MKMODE_L:String = "MKMODE_L";
        public static const MKMODE_R:String = "MKMODE_R";
        public static const MKMODE_TL:String = "MKMODE_TL";
        public static const MKMODE_TR:String = "MKMODE_TR";
        public static const MKMODE_BL:String = "MKMODE_BL";
        public static const MKMODE_BR:String = "MKMODE_BR";

        private static var stageInstance:Stage;

        private var lastTime:uint = getTimer();
        private var frames:Number = 0;
        private var monitorKitTextField:TextField;
        private var mode:String;
        private var textColor:uint;
        private var backgroundColor:uint;
        private var transparent:Boolean;
        public static var delay:Number = 0;

        public function MonitorKit(_mode:String = MKMODE_T, _transparent:Boolean = true, _textColor:uint = 0xffffff, _backgroundColor:uint = 0x000000)
        {
            mode = _mode;
            transparent = _transparent;
            textColor = _textColor;
            backgroundColor = _backgroundColor;
            // Initialize it when rendered on the stage.
            addEventListener(Event.ADDED_TO_STAGE, initMonitorHandler);
        }

        private function initMonitorHandler(event:Event):void
        {
            // Unregister the event handler
            removeEventListener(Event.ADDED_TO_STAGE, initMonitorHandler);
            stageInstance = this.stage;
            monitorKitTextField = new TextField();
            monitorKitTextField.selectable = false;
            monitorKitTextField.background = transparent;
            monitorKitTextField.textColor = textColor;
            monitorKitTextField.backgroundColor = backgroundColor;
            monitorKitTextField.autoSize = TextFieldAutoSize.LEFT;
            var format:TextFormat = new TextFormat();
            format.font = "Courier New";
            format.size = 15;
            monitorKitTextField.setTextFormat(format);
            monitorKitTextField.defaultTextFormat = format;
            monitorKitTextField.text = "[ Loading ]";
            addChild(monitorKitTextField);
            stageInstance.addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }

        public function enterFrameHandler(evt:Event):void
        {
            frames++;
            var currentTime:uint = getTimer();
            var deltaTime:uint = currentTime - lastTime;
            var fps:Number = frames / deltaTime * 1000;
            monitorKitTextField.text = "FPS: " + fps.toFixed(1);
            monitorKitTextField.appendText("\nMem: " + Number(System.totalMemory / 1024 / 1024).toFixed(3) + "(M)");
            frames = 0;
            lastTime = currentTime;
            // Replace the monitor object
            switch (mode)
            {
                case MKMODE_T:
                    monitorKitTextField.x = stageInstance.stageWidth / 2 - monitorKitTextField.width / 2;
                    monitorKitTextField.y = 0;
                    break;
                case MKMODE_B:
                    monitorKitTextField.x = stageInstance.stageWidth / 2 - monitorKitTextField.width / 2;
                    monitorKitTextField.y = stageInstance.stageHeight - monitorKitTextField.height;
                    break;
                case MKMODE_L:
                    monitorKitTextField.x = 0;
                    monitorKitTextField.y = stageInstance.stageHeight / 2 - monitorKitTextField.height / 2;
                    break;
                case MKMODE_R:
                    monitorKitTextField.x = stageInstance.stageWidth - monitorKitTextField.width;
                    monitorKitTextField.y = stageInstance.stageHeight / 2 - monitorKitTextField.height / 2;
                    break;
                case MKMODE_TL:
                    monitorKitTextField.x = 0;
                    monitorKitTextField.y = 0;
                    break;
                case MKMODE_TR:
                    monitorKitTextField.x = stageInstance.stageWidth - monitorKitTextField.width;
                    monitorKitTextField.y = 0;
                    break;
                case MKMODE_BL:
                    monitorKitTextField.x = 0;
                    monitorKitTextField.y = stageInstance.stageHeight - monitorKitTextField.height;
                    break;
                case MKMODE_BR:
                    monitorKitTextField.x = stageInstance.stageWidth - monitorKitTextField.width;
                    monitorKitTextField.y = stageInstance.stageHeight - monitorKitTextField.height;
                    break;
                default:
                    break;
            }
        }
    }
}