[rules-users] How to write a rule which only fires for a closest value?

[velven]

HI, i have a problem
using tileworld model, i'm supposed to write a rule which will cause the
agents to choose the tile in the agent's range which is closest to the
agent.

so a rough idea is

when

agent: Agent(x1:x, y1:y, r:range)

tile1: Tile(<tile's x to be between (x1+r) and (x1-r)> && <tile's y to be
between (y1+r and y1-r)>)

tile2: not Tile( < which is closer than the tile1 to agent> )

desperately need help,
alternatives tried::
i tried to use a query to return a list of tiles which is within the agent's
range then compared which one is closer and other similar implementation,
but this too slow for my simulation... 

I need one single good rule or efficient way of implementing the above rule 


then i tried to do multiple constraints too, say     x (> 30 && < 40) is ok
but 
                                                                  x (>
($x-$r) && < ($x+$r)) gives errors ,due to extra parenthesis? i dunno.. any
workarounds?

Thanks!


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