Ray Greenwell
fd665f3f83
2 decimal places. - Size our width accurately. git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@179 ed5b42cb-e716-0410-a449-f6a68f950b19
69 lines
2.2 KiB
ActionScript
69 lines
2.2 KiB
ActionScript
//
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// $Id$
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//
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// Nenya library - tools for developing networked games
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// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/nenya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.flash {
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import flash.events.Event;
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import flash.text.TextField;
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import flash.utils.getTimer; // function import
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public class FPSDisplay extends TextField
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{
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public function FPSDisplay (framesToTrack :int = 150)
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{
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background = true;
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text = "fps: 000.00";
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width = textWidth + 5;
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height = textHeight + 4;
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_framesToTrack = framesToTrack;
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addEventListener(Event.ENTER_FRAME, handleEnterFrame);
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}
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protected function handleEnterFrame (event :Event) :void
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{
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var curStamp :Number = getTimer();
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_frameStamps.push(curStamp);
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if (_frameStamps.length > _framesToTrack) {
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_frameStamps.shift(); // forget the oldest timestamps
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}
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var firstStamp :Number = Number(_frameStamps[0]);
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var seconds :Number = (curStamp - firstStamp) / 1000;
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// subtract one from the frames, since we're measuring the time
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// elapsed over the frames (when there are two timestamps, that's
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// the difference between 1 frame)
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var frames :Number = _frameStamps.length - 1;
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this.text = "fps: " + (frames / seconds).toFixed(2);
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}
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/** Timestamps of past ENTER_FRAME events. */
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protected var _frameStamps :Array = [];
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/** The number of running frames we track. */
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protected var _framesToTrack :int;
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}
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}
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