protected boolean isValidPos(Vector pos) throws OutOfBoundsException {

        if (getWorld() == null) {
            if (pos.getElemx() >= 0 && pos.getElemy() >= 0){
                return true;
            } else{
                throw new OutOfBoundsException(new Vector(0,0));
            }
        }else if ((pos.getElemx() >= 0) && (pos.getElemy() >= 0)
                && pos.getElemx() < this.getWorld().getWorldSizeInPixels()[0]
                        && pos.getElemy() < this.getWorld().getWorldSizeInPixels()[1]){
            return true;
        }else{
            return false;
        }

    }