public void update(float delta) {
for (EntityRef entity :
entityManager.iteratorEntities(
SimpleAIComponent.class, CharacterMovementComponent.class, LocationComponent.class)) {
LocationComponent location = entity.getComponent(LocationComponent.class);
SimpleAIComponent ai = entity.getComponent(SimpleAIComponent.class);
CharacterMovementComponent moveComp = entity.getComponent(CharacterMovementComponent.class);
Vector3f worldPos = location.getWorldPosition();
moveComp.getDrive().set(0, 0, 0);
// TODO: shouldn't use local player, need some way to find nearest player
LocalPlayer localPlayer = CoreRegistry.get(LocalPlayer.class);
if (localPlayer != null) {
Vector3f dist = new Vector3f(worldPos);
dist.sub(localPlayer.getPosition());
double distanceToPlayer = dist.lengthSquared();
if (distanceToPlayer > 6 && distanceToPlayer < 16) {
// Head to player
ai.movementTarget.set(localPlayer.getPosition());
ai.followingPlayer = true;
entity.saveComponent(ai);
} else {
// Random walk
if (Terasology.getInstance().getTimeInMs() - ai.lastChangeOfDirectionAt > 12000
|| ai.followingPlayer) {
ai.movementTarget.set(
worldPos.x + random.randomFloat() * 500,
worldPos.y,
worldPos.z + random.randomFloat() * 500);
ai.lastChangeOfDirectionAt = Terasology.getInstance().getTimeInMs();
ai.followingPlayer = false;
entity.saveComponent(ai);
}
}
Vector3f targetDirection = new Vector3f();
targetDirection.sub(ai.movementTarget, worldPos);
targetDirection.normalize();
moveComp.setDrive(targetDirection);
float yaw = (float) Math.atan2(targetDirection.x, targetDirection.z);
AxisAngle4f axisAngle = new AxisAngle4f(0, 1, 0, yaw);
location.getLocalRotation().set(axisAngle);
entity.saveComponent(moveComp);
entity.saveComponent(location);
}
}
}
