Dave Hoover
8f2700dcc8
git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@359 ed5b42cb-e716-0410-a449-f6a68f950b19
68 lines
2.1 KiB
ActionScript
68 lines
2.1 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.display.DisplayObject;
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/**
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* An Animation that linearly transitions the alpha attribute of a given display object from
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* one value to another and optionally executes a callback function when the transition is
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* complete.
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*/
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public class AlphaFade extends AnimationImpl
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{
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/**
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* Constructs a new AlphaFade instance. The alpha values should lie in [0, 1] and the
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* duration is measured in milliseconds.
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*/
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public function AlphaFade (disp :DisplayObject, from :Number = 0, to :Number = 1,
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duration :Number = 1, done :Function = null)
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{
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_disp = disp;
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_from = from;
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_to = to;
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_duration = duration;
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_done = done;
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}
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override public function updateAnimation (elapsed :Number) :void
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{
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if (elapsed < _duration) {
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_disp.alpha = _from + ((_to - _from) * elapsed) / _duration;
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return;
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}
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_disp.alpha = _to;
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stopAnimation();
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if (_done != null) {
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_done();
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}
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}
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protected var _disp :DisplayObject;
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protected var _from :Number;
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protected var _to :Number;
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protected var _duration :Number;
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protected var _done :Function;
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}
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}
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