Welcome to the Garbage World!

The garbage world uses the basic grid world functionality 
from the Russell/Norvig code, so your experience working
with the Vacuum world should serve you well.   There are 
differences both in the domain itself, and in how the 
code works, however.

The Domain
=============

The objects in the world are:
	-- the agent
	-- garbage
	-- paper
	-- recycling bins
	-- garbage cans

The agent's basic task is to put paper in the recycling
bins, and garbage in the garbage bin.  The agent has finite
capacity to carry objects (default 5). You will see in 
the world's performance measure that positive points 
are gathered for each piece of paper put in a bin and 
each piece of garbage put in a can.  There are penalties
for leaving garbage and paper in the world, for putting
garbage or paper in the wrong receptacle, and in addition 
each step is penalized.

Another difference in the way the world works is the nature
of the percept the agent gets.  Recall in the vacuum world 
the agent got only three pieces of information:
	-- bump;  whether the last action caused a bump
            against an obstacle
	-- dirt;  whether or not there is dirt here
	-- home;  whether or not the agent is back at its
		home position.

In contrast, a garbage world agent gets the following:
	-- agent;  the agent itself
	-- location;  an xy-coordinate indicating the 
		agent's current location in the grid
	-- heading;  the direction the agent is pointed in
	-- a list of all the objects at the current location
	-- the bump indicator as above.

Including the agent in the percept may seem a little strange, 
but it allows the agent to "remember" things about the world
or to maintain an "inner mental state."  See the examples to 
see how this might work.

=====================
The Code
=====================

There are a few differences between this code and the 
vacuum world code you saw:
	-- loader file.  This file will let you load
	    the entire environment
	-- examples file.  Several simple agents
	-- bug fixes.  All known bugs fixed!!

You might start by loading the full environment
(load-garbage-world), then running one of the examples
in examples.lsp, such as (cga-test), (hga-test), or 
(hga-test-2).  Also, you may want to change the font for the
toplevel window to be a monospace font, such as Courier New.
Go to the Preferences Menu, Main Preferences option.  From the 
Toploop tab, click on the *top-font* button, and then select 
Courier New (8 point).  Then click OK, then Apply, and then
Save (to have it be the new default), or Close (to just use it
until you next restart ACL).