add transparency support

CodeHaus Comment From: cholmes - Time: Tue, 21 Sep 2004 14:56:19 -0500
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<p>I think we've got this working, the only problem is that most of the output formats of GeoServer don't actually support transparency. But the code is there, and we've got some work to produce gifs (which do transparent), on the way as well...</p>

CodeHaus Comment From: ianturton - Time: Sat, 2 Oct 2004 10:10:40 -0500
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<p>further testing needed</p>

CodeHaus Comment From: ianturton - Time: Sat, 2 Oct 2004 10:12:09 -0500
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<p>change at line 303/304

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_ARGB);</p>

CodeHaus Comment From: ianturton - Time: Sat, 2 Oct 2004 10:14:48 -0500
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<p>simple test page - assumes you have geoserver running on 8080.

If all is working correctly you should see the cyan background through the images on the right but not the left. The lower row uses a semi-transparent style so it looks different on the right.</p>

CodeHaus Comment From: ianturton - Time: Sat, 2 Oct 2004 10:16:21 -0500
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<p>now works for png, I haven't tested it for gifs.</p>