Flash components we've made, display-related utils.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@161 ed5b42cb-e716-0410-a449-f6a68f950b19
2007-02-28 22:50:05 +00:00
parent 6e7b1741ff
commit 8e791eb994
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+//
+// $Id$
+//
+// Nenya library - tools for developing networked games
+// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/nenya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.flash {
+
+import flash.events.Event;
+
+import flash.text.TextField;
+
+import flash.utils.getTimer; // function import
+
+public class FPSDisplay extends TextField
+{
+    public function FPSDisplay (framesToTrack :int = 150)
+    {
+        background = true;
+        text = String(Number.MIN_VALUE);
+        height = textHeight + 4;
+
+        _framesToTrack = framesToTrack;
+
+        addEventListener(Event.ENTER_FRAME, handleEnterFrame);
+    }
+
+    protected function handleEnterFrame (event :Event) :void
+    {
+        var curStamp :Number = getTimer();
+        _frameStamps.push(curStamp);
+        if (_frameStamps.length > _framesToTrack) {
+            _frameStamps.shift(); // forget the oldest timestamps
+        }
+
+        var firstStamp :Number = Number(_frameStamps[0]);
+        var seconds :Number = (curStamp - firstStamp) / 1000;
+        // subtract one from the frames, since we're measuring the time
+        // elapsed over the frames (when there are two timestamps, that's
+        // the difference between 1 frame)
+        var frames :Number = _frameStamps.length - 1;
+
+        this.text = String(frames / seconds);
+    }
+
+    /** Timestamps of past ENTER_FRAME events. */
+    protected var _frameStamps :Array = [];
+
+    /** The number of running frames we track. */
+    protected var _framesToTrack :int;
+}
+}