[Swarm-Support] Observer Swarm Not updating

[Williamson, Robert J]

I'm having trouble getting my observer swarm to correctly update.

There are three obvious problems, that likely have the same root. I believe 
it's something i'm just not grasping about the library.

1) I have a grid2dImpl that holds resources at each space. I want to display 
the amount of resources on the "world", much like heat is displayed in the 
HeatBugs simulation. The only discernible difference i have found between my 
code and the HeatBugs code is that I am using a grid2dImpl while HeatBug uses a 
Diffuse2dImpl. However, teh resources are not painted on the grid.

2) Only the the initial agents created at the model start-up are drawn on the 
world. New ones are being created, i can see that the ArrayList of agents is 
growing, but they are not being drawn. 

3) I have an EZgraph plotting the population average of some parameter. The 
graph is also only using the initial population to get the average, my getter 
method for the parameter of interest does not even seem to be being called on 
newly created Agents.

To get the Agent list i have tried just passing the Selector my getAgents() 
method, and also having a running list in the ObserverSwarm that gets 
continuously updated (in the _update_ method i call getAgents() and assign the 
result to the list). However the results are the same in both instances.

I have tried looking up ways to do dynamic populations in Swarm, but haven't 
found much help. I considered making hierarchical swarms as suggested in this 
(http://www.swarm.org/pipermail/support/1999-November/007315.html) post, but 
this seems to be over complicating matters; especially since this looks like it 
is just an observer swarm issue.

I'm just looking for suggestions on this, or general suggestions on better ways 
to work a dynamic population simulation.

this is my basic current architecture:
ObserverSwarm ----> ModelSwarm --has Many--> Species --has many--> Agents

ModelSwarm has the getAgents() method that gets the list of Agents from each 
Species and compiles them into one ArrayList, that the ModelSwarm then returns.

I'm using Java.

Robert Williamson
Applied Biology/Software Engineering
Rose-Hulman Institute of Technology
CM# 909
432-294-0088