code: def move_distance(self, distance_x_m, distance_y_m, distance_z_m,
                        velocity=VELOCITY):
          
          distance = math.sqrt(distance_x_m * distance_x_m +
                               distance_y_m * distance_y_m +
                               distance_z_m * distance_z_m)
          flight_time = distance / velocity
  
          velocity_x = velocity * distance_x_m / distance
          velocity_y = velocity * distance_y_m / distance
          velocity_z = velocity * distance_z_m / distance
  
          self.start_linear_motion(velocity_x, velocity_y, velocity_z)
          time.sleep(flight_time)
          self.stop()
docs: Move in a straight line.
          positive X is forward
          positive Y is left
          positive Z is up
  
          :param distance_x_m: The distance to travel along the X-axis (meters)
          :param distance_y_m: The distance to travel along the Y-axis (meters)
          :param distance_z_m: The distance to travel along the Z-axis (meters)
          :param velocity: the velocity of the motion (meters/second)
          :return: