RandomMoveInGrid/architecture.txt

                        --------------------------------------------------------
                             |     |     |     |     |     |     |     |     |  Tick
                             |     |     |     |     |     |     |     |     | Count: 
                        --------------------------------------------------------
                              Start  Step  Init Stop  Pause Setup       Quit

GUIModel                  DisplaySurface         
extends Model             --------------
---------------           |            |                  Parameters, etc
| durf                    |            |                 ----------------
| worldDisplay            |            |                 | numAgents 20 |           
| colorMap                |            |                 | sizeX     10 |
|                         |            |                 | sizeY     10 |
                          |            |                 ----------------
                          --------------

------------------------------------------------------------------------------------
Model
extends ModelParameters extends SimModelImpl                Object2DDisplay                   
---------------------                                          --------
|                   |                                          |      |      
| numAgents    20   |                                          |      |                
| sizeX        10   |                                          --------
| SizeY        10   |                                      
|                   |                                      
| schedule          |            Schedule                  
|                   |          ---------------------- 
|                   |          | for each time step |
| world             |          |    this.step()     |
| agentList         |          ----------------------           Object2DGrid
---------------------                                       ---------------------
                                                            |                   |
   -----------------                                        |                   |   
   | o  o  ...   o |                                        |                   |  
   -----------------                                        |                   |  
                                                            |                   |  
---------     ---------                      ---------      |                   |  
| ID  0 |     | ID  1 |                      | ID 19 |      ---------------------
| x   8 |     | x   2 |      ...             | x   4 |
| y   1 |     | y   5 |                      | y   3 |
---------     ---------                      ---------

==================================================================================
Model extend ModelParameters extends SimModelImpl

- Inherits methods and IVs:  built-in parameters, report processing, RNG start/access
                             control panel, Settings windows, ...
        
- Model (or its superclass) must implement some methods that respond
    appropriately to GUI buttom presses (and to get things started)

  - main()    create the Model object (instance); init/load the model
              called once at run time (generally don't change)

  - setup()   get ready to build model (setup => "tearDown"!)
              clear/set variables; create new, empty schedule
              called at run time, and by [SETUP] button

  - begin()   build and initialize all the model parts:
              - buildModel()     "conceptual" model parts
              - buildDisplay()   any custom displays (rasters, plots, ...)
              - buildSchedule()  the schedule of activity
             Buttons: [INITIALIZE] or first [STEP] or [RUN]
 
  - getInitParam()  return array of parameter names (instance variables) to
                    display in the Settings-Parameters window
  - getters/setters for instance variables -- to see/change in GUI

  - getSchedule()   returns the schedule (used by Repast)
        advanced by [STEP] and [RUN] buttons