def set_boundaries(self, world):
        boundary_list = []
        landmark_size = 1
        edge = 1 + landmark_size
        num_landmarks = int(edge * 2 / landmark_size)
        for x_pos in [-edge, edge]:
            for i in range(num_landmarks):
                l = Landmark()
                l.state.p_pos = np.array([x_pos, -1 + i * landmark_size])
                boundary_list.append(l)

        for y_pos in [-edge, edge]:
            for i in range(num_landmarks):
                l = Landmark()
                l.state.p_pos = np.array([-1 + i * landmark_size, y_pos])
                boundary_list.append(l)

        for i, l in enumerate(boundary_list):
            l.name = 'boundary %d' % i
            l.collide == True
            l.movable = False
            l.boundary = True
            l.color = np.array([0.75, 0.75, 0.75])
            l.size = landmark_size
            l.state.p_vel = np.zeros(world.dim_p)

        return boundary_list
    def set_boundaries(self, world):
        boundary_list = []
        landmark_size = 1
        edge = 1 + landmark_size
        num_landmarks = int(edge * 2 / landmark_size)
        for x_pos in [-edge, edge]:
            for i in range(num_landmarks):
                l = Landmark()
                l.state.p_pos = np.array([x_pos, -1 + i * landmark_size])
                boundary_list.append(l)

        for y_pos in [-edge, edge]:
            for i in range(num_landmarks):
                l = Landmark()
                l.state.p_pos = np.array([-1 + i * landmark_size, y_pos])
                boundary_list.append(l)

        for i, l in enumerate(boundary_list):
            l.name = 'boundary %d' % i
            l.collide = True
            l.movable = False
            l.boundary = True
            l.color = np.array([0.75, 0.75, 0.75])
            l.size = landmark_size
            l.state.p_vel = np.zeros(world.dim_p)

        return boundary_list
def create_noise_field(world_dim):
    noise_field = Landmark()
    noise_field.name = 'noise field'
    noise_field.collide = False
    noise_field.movable = False
    noise_field.boundary = False
    noise_field.size = ENV_NOISE_DISTANCE
    noise_field.state.p_pos = np.random.uniform(-1, 1, world_dim)
    noise_field.state.p_vel = np.zeros(world_dim)
    noise_field.color = np.array([0.3,0.3,0.3])
    return noise_field