1. GridWorld Part 4
Meet the Critters

2. Critter’s act() if (getGrid() == null) return;
ArrayList<Actor> actors = getActors();
processActors(actors);
ArrayList<Location> moveLocs = getMoveLocations();
Location loc = selectMoveLocation(moveLocs);
makeMove(loc);

3. getActors() Gets all neighbors
Override to get Actors from different locations

4. processActors()
Eats surrounding Actors unless they’re a Rock or a Critter
Use instanceOf
if (!(a instanceof Rock) && !(a instanceof Critter))
a.removeSelfFromGrid();
Override to
Add
Not eat
Eat differently

5. getMoveLocations() Returns empty neighbors
Override to get possible locations differently
Locations that are not empty

6. selectMoveLocation(ArrayList)
Randomly picks a location from ArrayList<Location>
Override to select by other method

7. makeMove(Location) Moves to the new Location Override to
Leave something in previous spot
turn

8. Extending Critter

9. Chameleon Critter Overrides processActors makeMove
If there is a neighbor, Matches their color
makeMove
Turn in direction that it’s moving

10. CrabCritter Overrides getActors getMoveLocations() makeMove
Only look front, front right, and front left
getMoveLocations()
Returns empty locations to the right and left
makeMove
Will randomly turn left or right if it doesn’t move