Re: Inter-agent communication in Discrete2d

[Steve Railsback]

John Langley wrote:

> Hi,
>
> I have agent running around on a Discrete2d object.
>
> I would like to have them access each others variables when they bump
> into each other, using this kind of approach:
>
> -(int)someMethod
> {
> return somePointer;
> }
>
>
> I cannot find a way of getting one agent to send a message directly to
> another agent, based on grid reference, and be returned some internal
> value, e.g. somePointer.
>
>
> It is possible for one agent to check if a neighbouring cell is occupied
> by e.g.:
>
> if ([world getObjectAtX: newX Y: newY] = 1    -> 'cell occupied'
>
> if ([world getObjectAtX: newX Y: newY] = nil  -> 'cell empty'
>
>
> Where 'world' is the pointer, or 'id' to Discrete2d.
>
> The getObjectAtX: xPos Y:yPos method only allows an agent to detect if
> there is another agent at some other position, but apparently does not
> allow returning of internal values from methods.


Hmm, Discrete2d should do what you want- getObjectAtX: Y: returns the 
object at X,Y, not a 1.  (It is just a typo in your email that you use a 
single "=" instead of "==" ?)

You should be able to do stuff like:

if  ([world getObjectAtX: newX Y: newY] != nil)
  neighborsSize = [[world getObjectAtX: newX Y: newY] getSize];


where getSize is just a method that the agents have that returns their size.

Check for typos or syntax errors...







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