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 // Nenya library - tools for developing networked games
 // Copyright (C) 2002-2012 Three Rings Design, Inc., All Rights Reserved
 // 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
// 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
An animation that displays an image fading from one alpha level to another in specified increments over time. The animation is finished when the specified target alpha is reached.
public abstract class FadeAnimation extends Animation
Constructs a fade animation.

bounds our bounds.
alpha the starting alpha.
step the alpha amount to step by each millisecond.
target the target alpha level.
    protected FadeAnimation (Rectangle boundsfloat alphafloat stepfloat target)
         = new FadeEffect(alphasteptarget);
    public void tick (long timestamp)
        if (.tick(timestamp)) {
             = .finished();
    public void paint (Graphics2D gfx)
    protected void willStart (long tickStamp)

Here is where derived animations actually render their image.
    protected abstract void paintAnimation (Graphics2D gfx);

This handles the main work of fading.
    protected FadeEffect _effect;
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