[ptx] Alternative fisheye projections

[Markku Kolkka]

Bruno Postle kirjoitti viestissään (lähetysaika lauantai, 1. 
huhtikuuta 2006 02:13):

> This looks much better to me, but I know that the math is
> wrong (the picture gets "pinched" in the middle).  Does anyone
> have any idea how to do this properly?

Stereographic projection: 
http://en.wikipedia.org/wiki/Stereographic_projection
Other conformal projections:
http://en.wikipedia.org/wiki/Map_projections#Conformal

-- 
 Markku Kolkka
 markku.kolkka at iki.fi