REPAST JAVA GETTING STARTED 7
update the Zombies position in the Grid by converting its location in the ContinuousSpace
to int coordinates appropriate for a Grid.
Once you’ve written this moveTowards() method, add a call to it in the step() method.
The end of the step() should now look like:
1 for ( GridCell < Human > cell : gri dCells ) {
2 if ( cell . size () > maxCou nt ) {
3 p oi ntW it hMo st Hum an s = cell . getPoint ();
4 maxCo unt = cell . size ();
5 }
6 }
7 moveTowards ( p ointW ithMo stH um ans );
Listing 5. Step with MoveTowards Added
Note the addition of the call to moveTowards() following the for loop.
We want the step method to be called every iteration of the simulation. We can do this
by adding an @ScheduledMethod annotation on it. Obviously, the method itself is part of a
class, and thus what we are actually scheduling are invocations of this method on instances
of this class. For example, if we have 10 Zombies, then we can schedule this method to be
called on each of those Zombies. The annotation has a variety of parameters that are used
to specify when and how often the method will be called, the number of object instances
to invoke the method on, and so on.
5
1 @S che du le dMe th od ( start = 1, int erval = 1)
2 public void step () {
3 // get the grid l oca tion of this Zombie
4 GridPoint pt = grid . ge tL ocation ( this );
Listing 6. Step Method with Annotation
The parameters here in line 1 will schedule the step method to be called on all Zombies
starting at tick (timestep) 1 and every tick thereafter.
Let’s now turn to the code for the Humans. Select Human.java in Eclipse’s editor
pane. The basic behavior for a Human is to react when a Zombie comes within its local
neighborhood by running away from the area with the most Zombies. Additionally, Humans
have a certain amount of energy that is expended in running away. If this energy is 0 or
less then a Human is unable to run. We begin by creating the relevant field variables and
constructor.
5
See the Repast Java API documentation and the Repast Reference for more information on the
@ScheduledMethod annotation.
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