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Re: OT: Need a graphics algorithm

A better solution would be (I assume that you have B in a separate bitmap, since you want to adjust the transparency) to pre-process B before it gets copied into A. Just scan each line and when you encounter an edge, perform "antialiasing" by manipulating the alpha value of the pixels around (just like the traditional antialiasing techniques)

Florent

On 8 nov. 03, at 01:00, Trygve Inda wrote:

Any ideas on this?...

In a rectangular 24bit RGB pixel field, two areas A & B, both are contiguous
(no islands), but B is an island within A. Given a point in B, find the
straight line distance to the nearest point in A... And do it quickly.

What I am ultimately trying to do is antialias the edge of a "blob" (B). I
figure if I can find the distance to the edge I can just adjust the
transparency when it gets within 2 pixels or so. Maybe there is a better
way, but this was my initial thought.

Thanks for any suggestions.

Trygve
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--
Florent Pillet, Code Segment email@hidden
Developer tools and end-user products for Palm OS & Mac OS X
ICQ: 117292463 http://perso.wanadoo.fr/fpillet
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References: 
 >OT: Need a graphics algorithm (From: Trygve Inda <email@hidden>)



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