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/*
* hexagon framework - Multi-Purpose ActionScript 3 Framework.
* Copyright (C) 2007 Hexagon Star Softworks
* __ __
* __/ \__/ \__ __
* / \__/HEXAGON \__/ \
* \__/ \__/ FRAMEWORK_/
* \__/ \__/
*
* ``The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*/
package com.hexagonstar.util.debug
{
import flash.display.Stage;
import flash.events.Event;
import flash.events.EventDispatcher;
import flash.events.TimerEvent;
import flash.utils.Timer;
/**
* Simple Stage framrate measuring class.
*/
public class FPSMeter extends EventDispatcher
{
// Properties /////////////////////////////////////////////////////////////////
public static const FPS_UPDATE:String = "fpsUpdate";
private var _stage:Stage;
private var _timer:Timer;
private var _fps:int;
private var _isRunning:Boolean;
// Constructor ////////////////////////////////////////////////////////////////
/**
* Constructor
*/
public function FPSMeter(stage:Stage)
{
_stage = stage;
_fps = 0;
_isRunning = false;
}
// Public Methods /////////////////////////////////////////////////////////////
/**
* Starts FPS polling.
*/
public function start(pollInterval:uint = 1000):void
{
if (!_isRunning)
{
_isRunning = true;
_timer = new Timer(pollInterval, 0);
_timer.addEventListener(TimerEvent.TIMER, onTimer);
_stage.addEventListener(Event.ENTER_FRAME, onEnterFrame);
_timer.start();
}
}
/**
* Stops FPS polling.
*/
public function stop():void
{
if (_isRunning)
{
_isRunning = false;
_timer.stop();
_timer.removeEventListener(TimerEvent.TIMER, onTimer);
_stage.removeEventListener(Event.ENTER_FRAME, onEnterFrame);
_timer = null;
}
}
/**
* Returns the current FPS.
*
* @return The currently polled frames per second.
*/
public function getFPS():int
{
return _fps;
}
// Private Methods ////////////////////////////////////////////////////////////
/**
* Called on every Timer event.
* @private
*/
private function onTimer(event:TimerEvent):void
{
dispatchEvent(new Event(FPSMeter.FPS_UPDATE));
_fps = 0;
}
/**
* Called on every EnterFrame event.
* @private
*/
private function onEnterFrame(event:Event):void
{
_fps++;
}
}
}
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