[Freeciv-Dev] Re: (PR#8624) New clima function to best handle terrain place, used to place poles.

["Marcelo Burda" <mburda@xxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=8624 >

Le sam 29/05/2004 à 10:51, Jason Short a écrit :
> <URL: http://rt.freeciv.org/Ticket/Display.html?id=8624 >
> 
> Just a question...
> 
> Your clima projection puts the poles at the midpoints of the boundaries, 
> right?  But in a quincunx isn't this where the singularities go?  Or is 
> it different if you use a 2x1 quincunx instead of a 1x1 one?
> 
> jason
in quincutial_sq the singularities are in midle point.(this is the base
quincutial topo)
if this topo is rotated 45° we can get:
A) quincutial (wrapx simple, wrapy reversed the singulairitesare
1 at midle point of reversed wrap edge
2 at corners see
http://rt.freeciv.org/Ticket/Attachment/46023/33599/WorldVQuincV0.jpeg
B)in twisted quincuntial (wrap x simple, wrap y reversed and offset)
the 4 singularities are in the reverse edge at 1/4 of the corners

all 3 quincutial way are topological (math) the some

the actual code put poles over 4 of 4 singularities in quincutial_sq
this make maps with 4 poles!, this code can be change to make only 2,
see the quincutial patch
with only 2 poles on syngularities you get a map
http://rt.freeciv.org/Ticket/Attachment/46023/33602/WorldSqQuinc_PolarV0.jpeg

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