/**
* 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();
}
}
}
