Homework 3: Leader following behavior: 50 points

In this assignment, you will make the wedges in the steering project
follow one another.  To do this you should make a copy of the
Steering project; you probably should change its name so that you
won't get it confused with the original Steering project.

After you have a copy of the Steering project, go to the params.ini
file and change the value of the numAgents parameter from 300 to 20.
Also, change the AlignmentWeight parameter from 1.0 to 0.0. We don't
want wedge flying parallel to their neighbors because of the Alignment
steering function.

Now go to the SteeringBehavior.java file and modify the Cohesion
method (line 586) so that it finds the closest neighbor that is in
front of the vehicle. After you find that neighbor, compute a
position near that neighbor to be the target position you want your
vehicle to go to.  The book suggests using the Arrive method to
compute the steering force, but you will want to try other methods as
well and see if you can get better behavior with another method.

The behavior you want is for the little wedges to line up and follow
one another.  One wedge will take the lead, and others will get in
line behind him.  When several such lines form and get close to each
other, they will merge into a longer line. If the big wedge (the
"Hawk") gets close to a line, the wedges in the line scatter, but then
regroup in a line after they get away from the big wedge.  Experiment
to see what is the best value for the SeparationWeight so that the
wedges in a line spread out and don't bunch up too much.

Turn in to the TA a copy of your definition of the Cohesion method,
a screenshot showing most of the wedges marching in a single line, and
mention in your email the SeparationWeignt value that you found was
the most effective.