帧频内存FPS类

转载
//直接addChild(new FPS())

//////////////////////////////////////////////

package {
        import flash.display.*;
        import flash.events.*;
        import flash.geom.*;
        import flash.system.*;
        import flash.text.*;
        import flash.utils.*;

        public class FPS extends Sprite {
                private var currentY:int;
                private var diagramTimer:int;
                private var tfTimer:int;
                private var diagram:BitmapData;
                private var mem:TextField;
                private var fps:TextField;
                private var tfDelay:int = 0;
                static private const maxMemory:uint = 4.1943e+007;
                static private const diagramWidth:uint = 60;
                static private const tfDelayMax:int = 10;
                static private var instance:FPS;
                static private const diagramHeight:uint = 40;
                public function FPS():void {
                        this.addEventListener(Event.ADDED_TO_STAGE,run);
                }

                private function run(e:Event):void {
                        if (instance == null) {
                                instance=this;
                                fps = new TextField();
                                mem = new TextField();
                                this.mouseEnabled = false;
                                this.mouseChildren = false;
                                fps.defaultTextFormat = new TextFormat("Tahoma", 10, 13421772);
                                fps.autoSize = TextFieldAutoSize.LEFT;
                                fps.text = "FPS: " + Number(stage.frameRate).toFixed(2);
                                fps.selectable = false;
                                fps.x = -diagramWidth - 2;
                                addChild(fps);
                                mem.defaultTextFormat = new TextFormat("Tahoma", 10, 13421568);
                                mem.autoSize = TextFieldAutoSize.LEFT;
                                mem.text = "MEM: " + bytesToString(System.totalMemory);
                                mem.selectable = false;
                                mem.x = -diagramWidth - 2;
                                mem.y = 10;
                                addChild(mem);
                                currentY = 20;
                                diagram = new BitmapData(diagramWidth, diagramHeight, true, 0x20ffff00);
                                var _loc_2:Bitmap = new Bitmap(diagram);
                                _loc_2.y = currentY + 4;
                                _loc_2.x = -diagramWidth;
                                addChildAt(_loc_2, 0);
                                this.addEventListener(Event.ENTER_FRAME, onEnterFrame);
                                this.stage.addEventListener(Event.RESIZE, onResize);
                                onResize();
                                diagramTimer = getTimer();
                                tfTimer = getTimer();
                        }
                }
                private function bytesToString(memory:uint):String {
                        var _str:String;
                        if (memory < 1024) {
                                _str = String(memory) + "b";
                        } else if (memory < 10240) {
                                _str = Number(memory / 1024).toFixed(2) + "kb";
                        } else if (memory < 102400) {
                                _str = Number(memory / 1024).toFixed(1) + "kb";
                        } else if (memory < 1048576) {
                                _str =int(memory / 1024) + "kb";
                        } else if (memory < 10485760) {
                                _str = Number(memory / 1048576).toFixed(2) + "mb";
                        } else if (memory < 104857600) {
                                _str = Number(memory / 1048576).toFixed(1) + "mb";
                        } else {
                                _str = int(memory / 1048576) + "mb";
                        }
                        return _str;
                }

                private function onEnterFrame(e:Event):void {
                        tfDelay++;
                        if (tfDelay >= tfDelayMax) {
                                tfDelay = 0;
                                fps.text = "FPS: " + Number(1000 * tfDelayMax / (getTimer() - tfTimer)).toFixed(2);
                                tfTimer = getTimer();
                        }
                        var _loc_2:* = 1000 / (getTimer() - diagramTimer);
                        var _loc_3:* = _loc_2 > stage.frameRate ? (1) : (_loc_2 / stage.frameRate);
                        diagramTimer = getTimer();
                        diagram.scroll(1, 0);
                        diagram.fillRect(new Rectangle(0, 0, 1, diagramHeight), 0x20ffff00);
                        diagram.setPixel32(0, diagramHeight * (1 - _loc_3), 0xffcccccc);
                        mem.text = "MEM: " + bytesToString(System.totalMemory);
                        var _loc_5:Number = System.totalMemory / maxMemory;
                        diagram.setPixel32(0, diagramHeight * (1 - _loc_5), 0xffff6600);
                }
                private function onResize(e:Event = null):void {
                        var _point:Point = parent.globalToLocal(new Point(80, 90));//stage.stageWidth
                        this.x = _point.x;
                        this.y = _point.y;
                }
        }
}