[Freeciv-Dev] Re: flying AI (PR#1162)

[Petr Baudis <pasky@xxxxxxxxxxx>]

Dear diary, on Sat, Dec 29, 2001 at 07:16:05AM CET, I got a letter,
where Raahul Kumar <raahul_da_man@xxxxxxxxx> told me, that...
>  b = unit_types[n].build_cost + 40;
> 
> I have no idea why we add 40 to build cost. If someone knows, speak up.
> Ross, Petr?
Quick recapitulation where's 40 used for which...

First, it's used as city walls and coastal defense value. Probably just a
coincidence, but probably not.

Then, it's used in setting up the value of the unit, everytime we add the
value BUT one case:

      if (!is_ground_unit(myunit) && !is_heli_unit(myunit) &&
         (!(acity->ai.invasion&1))) b -= 40; /* boats can't conquer cities */

So it appears to me that 40 is the 'value of ability to conquer' :). Ross?

To fix less desire for building boats for invasion (?), we also do:

    if (is_ground_unit(myunit) && !sanity && !boatid)
      needferry = 40; /* cost of ferry */

and add needferry to fprime later, on the same place where we use + 40 in
similiar calculations.

-- 

                                Petr "Pasky" Baudis

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