def get_moves(pos, xs, ys, step):
    """
    Get the 5 possible moves from a position given a constant speed.
    (left, right, forward, back, stay still)
    :param pos:
    :param xs:
    :param ys:
    :param step:
    :return:
    """
    moves = []
    for dx, dy in [(-step, 0), (step, 0), (0, -step), (0, step), (0, 0)]:
        x = pos[0] + dx
        y = pos[1] + dy

        moves.append((x, y))

    return moves