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

[Raahul Kumar <raahul_da_man@xxxxxxxxx>]

--- Petr Baudis <pasky@xxxxxxxxxxx> wrote:
> Dear diary, on Sat, Dec 29, 2001 at 07:40:18AM CET, I got a letter,
> where Raahul Kumar <raahul_da_man@xxxxxxxxx> told me, that...
> > Some additional titbits for you. Hope this makes the function clearer.
> > I strongly suspect you want me to explain the 
> > 
> > else b0 = ((b * a - f * d) * SHIELD_WEIGHTING / (a + d)) - 
> > 1412 c * (unhap ? SHIELD_WEIGHTING + 2 * TRADE_WEIGHTING :
> SHIELD_WEIGHTING);
> > 
> > Sorry. I'm still trying to figure out the behaviour of amortise myself.
> > Will send in  a patch sometime next century when I figure out what the
> > hell Syela was thinking. Basic summary of amortise - we figure out what
> > the effect of unhappiness will be from building this unit, affect on
> trade(only
> > matters for caravans/freights), the shield weighting( to prevent cities
> > building
> > one more unit that exhausts all shields). Unfortunately, the devil is in
> the
> > details. 
> 
> I didn't find that line anywhere, however Syela use very similiar formulas
> here. So let's have a look at a bit different version of this ;-).
> 
> First, original version, so that we can find similiarity with the above:
> 
>       else {
>         b0 = (b * a - (f + (acity ? acity->ai.f : 0)) * d) * g *
> SHIELD_WEIGHTING / (a + g * d);
>         if (acity && b * acity->ai.a * acity->ai.a > acity->ai.f * d)
>           b0 -= (b * acity->ai.a * acity->ai.a - acity->ai.f * d) *
>                            g * SHIELD_WEIGHTING / (acity->ai.a * acity->ai.a
> + g * d);
>       }
>       if (b0 > 0) {
>         b0 -= l * SHIELD_WEIGHTING;
>         b0 -= c * (unhap ? SHIELD_WEIGHTING + 2 * TRADE_WEIGHTING :
> SHIELD_WEIGHTING);
>       }
> 
> and a bit more coder-friendly version:
> 
>       } else {
>         desire = (value * attack - (build_cost + (acity ? acity->ai.f : 0)) *
> resist) * protect * SHIELD_WEIGHTING /
>                  (attack + protect * resist);
> 
>         if (acity && value * acity->ai.a * acity->ai.a > acity->ai.f *
> resist)
>           desire -= (value * acity->ai.a * acity->ai.a - acity->ai.f *
> resist) *
>                     protect * SHIELD_WEIGHTING / (acity->ai.a * acity->ai.a +
> protect * resist);
>       }
> 
>       if (desire > 0) {
>         desire -= tech_cost * SHIELD_WEIGHTING;
>         desire -= move_cost * (unhap ? SHIELD_WEIGHTING + 2 * TRADE_WEIGHTING
> : SHIELD_WEIGHTING);
>       }
> 
> Sorry, but I've currently no time to explain this more, as I must go outdoors
> now ;p. However you are welcome to have a look at CVS to see how are these
> values initialized (so what they mean), send me some comments patches etc
> ;-).
> 
> -- 
> 
>                               Petr "Pasky" Baudis
> 
> UN*X programmer, UN*X administrator, hobbies = IPv6, IRC, FreeCiv, (e)links
> .
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> doorkeeper
> will not permit you to enter. In some extreme cases these doorkeepers will
> not
> let you out, or at least give you a hard time before they finally let you
> out.
> .
> Public PGP key, geekcode and stuff: http://pasky.ji.cz/~pasky/
> 


That sounds good. The problem always lies in naming the goddamn variables.
I just lack the ideas for good names that are not already used elsewhere in
Freeciv in mean other things.

Desire, is this like want? I assume the 0-100 stuff all applies here, I just
wish I knew exactly how all these weights interact to decide what gets built.


Are you sure b is equal to value? How does the build_cost + 40 fit in?

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