/**
* Helper method to move the animal from the edge of the arena, based on its current x and y
* coordinates
*
* @param x - coordinate of the animal's current location
* @param y - coordinate of the animal's current location
*/
private Command moveFromEdge(
int x, int y, ArenaWorld world, ArenaAnimal animal, Location currentLocation) {
Location eastOf = new Location(currentLocation, Direction.EAST);
Location southOf = new Location(currentLocation, Direction.SOUTH);
Location westOf = new Location(currentLocation, Direction.WEST);
Location northOf = new Location(currentLocation, Direction.NORTH);
Location randomLoc;
// if fox is at top left quadrant, move east
if (y <= world.getHeight() / 2
&& x <= world.getWidth() / 2
&& isLocationEmpty(world, animal, eastOf)) {
return new MoveCommand(animal, eastOf);
}
// if fox is at top right quadrant, move south
else if (y <= world.getHeight() / 2
&& x >= world.getWidth() / 2
&& isLocationEmpty(world, animal, southOf)) {
return new MoveCommand(animal, southOf);
}
// if fox is at bottom right quadrant, move west
else if (y >= world.getHeight() / 2
&& x >= world.getWidth() / 2
&& isLocationEmpty(world, animal, westOf)) {
return new MoveCommand(animal, westOf);
}
// if fox is at bottom of arena, move north
else if (y >= world.getHeight() / 2
&& x <= world.getWidth() / 2
&& isLocationEmpty(world, animal, northOf)) {
return new MoveCommand(animal, northOf);
}
// move in random direction
else {
int count = 0;
do {
randomLoc = Util.getRandomEmptyAdjacentLocation((World) world, currentLocation);
if (randomLoc == null) {
return new WaitCommand();
}
count++;
} while (randomLoc.getDistance(currentLocation) > 1 && count < 4);
if (Util.isValidLocation(world, randomLoc)
&& Util.isLocationEmpty((World) world, randomLoc)
&& count < 4) {
return new MoveCommand(animal, randomLoc);
} else {
return new WaitCommand();
}
}
}
@Override
public Command getNextAction(ArenaWorld world, ArenaAnimal animal) {
// TODO: Change this. Implement your own AI to make decisions regarding
// the next action.
final Location CURRENT_LOCATION = animal.getLocation();
final int ENERGY = animal.getEnergy();
final int STRENGTH = animal.getStrength();
final int MAX_ENERGY = animal.getMaxEnergy();
final int VIEW_RANGE = animal.getViewRange();
final int BREEDING_ENERGY = MAX_ENERGY - 20;
// look around fox's surroundings
int proximity;
Set<Item> surroundingItems = new TreeSet<Item>();
surroundingItems = world.searchSurroundings(animal);
// check things closest to fox first
for (proximity = 1; proximity <= VIEW_RANGE; proximity++) {
for (Item currentItem : surroundingItems) {
if (currentItem.getLocation().getDistance(CURRENT_LOCATION) == proximity) {
// if item is a rabbit
if (currentItem.getName().equals("Rabbit")) {
if (proximity == 1) {
// eat rabbit if next to the rabbit
if (currentItem.getStrength() < STRENGTH) {
return new EatCommand(animal, currentItem);
}
} else {
// otherwise go towards the rabbit
Direction toRabbit =
Util.getDirectionTowards(CURRENT_LOCATION, currentItem.getLocation());
Location gotoRabbit = new Location(CURRENT_LOCATION, toRabbit);
if (Util.isLocationEmpty((World) world, gotoRabbit)) {
return new MoveCommand(animal, gotoRabbit);
}
}
}
// if item is fox, spread out, don't compete for food
if ((currentItem.getName().equals("Fox") || currentItem.getName().equals("grass"))
&& proximity < 2) {
Direction awayfromFox =
Util.getDirectionTowards(currentItem.getLocation(), CURRENT_LOCATION);
Location ownTurf = new Location(CURRENT_LOCATION, oppositeDir(awayfromFox));
if (Util.isLocationEmpty((World) world, ownTurf)) {
return new MoveCommand(animal, ownTurf);
}
}
}
}
}
// if nothing is around the fox,
Location randomAdjLoc = Util.getRandomEmptyAdjacentLocation((World) world, CURRENT_LOCATION);
// breed if enough energy
if (ENERGY > BREEDING_ENERGY && randomAdjLoc != null) {
return new BreedCommand(animal, randomAdjLoc);
}
// otherwise move systematically around clockwise
Command move =
moveFromEdge(
CURRENT_LOCATION.getX(), CURRENT_LOCATION.getY(), world, animal, CURRENT_LOCATION);
return move;
}