FPS counter

该类在任何一个flash/flex程序都可以用，用于计算帧频  和程序占用的内存 。

package{import flash.display.Sprite;import flash.text.TextField;import flash.utils.getTimer;import flash.system.System;public class FrameRater extends Sprite{public var frameRate_tf:TextField;public var memory_tf:TextField;public var lastTen:Array;public var lastTime:Number;public function FrameRater (){frameRate_tf = new TextField();frameRate_tf.x = 0;frameRate_tf.y = 0;frameRate_tf.selectable = false;addChild (frameRate_tf); memory_tf = new TextField();memory_tf.x = 0;memory_tf.y = 15;memory_tf.selectable = false;addChild (memory_tf); lastTen = new Array();lastTime = getTimer();}public function Update (){var timeTaken:Number = getTimer() - lastTime;lastTime = getTimer();lastTen.push (1000/timeTaken);var average:Number;var sum:Number = 0;for (var i in lastTen){sum += lastTen[i];}average = sum/lastTen.length;if (lastTen.length > 10){lastTen.splice (0,1);}frameRate_tf.text = ""+Math.round(average)+" FPS";memory_tf.text = ""+Math.round(System.totalMemory/1024/1024)+" MB";}}}

只需在每帧调用Update :  下面是例子：

package{public class Project{public var fps:FrameRater;public function Project (){fps = new FrameRater ();addChild (fps);addEventListener (Event.ENTER_FRAME,Update);}public function Update (e:Event){fps.Update ();}}}