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Re: rasterarray border?

• To: mathgroup at smc.vnet.net
• Subject: [mg56039] Re: rasterarray border?
• From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
• Date: Thu, 14 Apr 2005 08:54:33 -0400 (EDT)
• Organization: Uni Leipzig
• References: <d3ia99$9jj$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

you need a line/circle drawing algorithm that work 
on the
RasterArray[], look in the standard text books on 
computer
raster graphics for "Bresenham Line-Drawing"

Regards
  Jens

"Manuel Marques-Pita" <m.marques-pita at ed.ac.uk> 
schrieb im Newsbeitrag 
news:d3ia99$9jj$1 at smc.vnet.net...
> hello,
>
> I am drawing a rasterarray in which I need to 
> draw a border/stroke round
> some of the elements in the array (all the ones 
> != -1 below).
>
> Show[Graphics[RasterArray[von /.
>           {-1 -> RGBColor[1, 1, 1],
>             0 -> RGBColor[0.97, 0.97, 1],
>             1 -> RGBColor[0.3, 0, 0],
>             2 -> RGBColor[1, .78, .78]}]],
>     AspectRatio -> Automatic];
>
> I haven't found a way to do this yet, any 
> ideas/suggestions?
>
> Thanks in advance!
>
> Manuel
>