[Freeciv-Dev] Re: (PR#3936) introducing native coordinates

[Raimar Falke <rf13@xxxxxxxxxxxxxxxxx>]

On Wed, Apr 09, 2003 at 06:30:12AM -0500, Jason Dorje Short wrote:
> >That is quite possible. I'm still trying to understand.

Another try. See the two attached pictures. So there is a compact form
and a rotated form. Both are identical for non-iso maps. In addition
there is the view form which it hard to draw so I use ascii here.

View form (iso tileset):

    a b c d e f g h i
1   # # # # # # # # #       Since it isn't clear I specify that the
2    # # # # # # # # #      tile right below b1 is called b2 and not a2.
3   # # # # # # # # #
4    # # # # # # # # #
5   # # # # # # # # #

View form (non-iso tileset):
  Similar to grid_rot.png.

The view form is irrelevant for the semantics of the functions since
it depends on the view (iso tileset or non-iso one)?! It looks like
this is untrue: you specify the semantics of the function based on the
iso tileset view form since otherwise the semantic of
square_map_iterate doesn't changes (it is the same for compact and
rotated form). Yes/no?

So square_map_iterate(d3) is

    a b c d e f g h i
1   # # # o # # # # #
2    # # o o # # # # #
3   # # o + o # # # #
4    # # o o # # # # #
5   # # # o # # # # #

which is in the compact form

    a b c d e f g h i
1   # # # o # # # # #
2   # # o o # # # # #
3   # # o + o # # # #
4   # # o o # # # # #
5   # # # o # # # # #

That is [c2, c3, c4, d1, d2, d4, d5, e3]. Yes/no?

Just for completeness: if we define this semantics of the operations
at the compact or the rotated for the answer would be:

square_map_iterate(d3)
    a b c d e f g h i
1   # # # # # # # # #
2   # # o o o # # # #
3   # # o + o # # # #
4   # # o o o # # # #
5   # # # # # # # # #

That is [c2, c3, c4, d2, d4, e2, e3, e4].

I'm hoping that we get slowly get to the core of the things.

        Raimar

-- 
 email: rf13@xxxxxxxxxxxxxxxxx
 "How about the new language C&? No, that's not 'c ampersand', 'c reference', 
  'reference to c' or 'c and'. It's pronounced 'campersand', to confuse the 
  hell out of people who are unfamiliar with it, and it will, of course, 
  have no pointers."
    -- Xazziri in comp.lang.c++ about C#

grid_compact.png
Description: PNG image

grid_rot.png
Description: PNG image