for (int i = 0; i < numEntities; ++i) {
Entity entity = world.createEntity();
if (Constants.shouldHaveComponent(ComponentType.POSITION, i)) {
PositionComponent pos = new PositionComponent();
pos.pos.x = MathUtils.random(Constants.MIN_POS, Constants.MAX_POS);
pos.pos.y = MathUtils.random(Constants.MIN_POS, Constants.MAX_POS);
entity.addComponent(pos);
}