Nosebot

Attempts to move the robot one step forward in its current heading (as per advanceCarefully). Failing that, turns the robot 90 degrees clockwise instead.

Checks the square that neighbors the nosebot in the given direction to see if it contains something that the nosebot considers an obstacle. Nosebots are careful: they consider every square that isn’t empty to be an obstacle. This behavior overrides the default implementation from class RobotBrain.

(A consequence of this is that a nosebot will consider itself stuck unless there is at least one empty square next to it. See isStuck and controlTurn.)

Moves the robot. A nosebot first looks at the next square in the direction it is currently facing. If that square is empty, it moves there and ends its turn. If the square was not empty, the bot turns 90 degrees clockwise and immediately tries again (during the same turn): it again moves a step forward if possible, and turns to check the next direction if necessary. In case the robot completes a 360-degree turnabout without finding a suitable square to move in, it ends its turn without changing location.

If other words, a nosebot uses its turn to call attemptMove up to four times.

As a nosebot always looks where it’s going, so it can never collide with anything during its own turn. A nosebot only ever moves a single square per turn.

This method assumes that it is not called if the robot is broken or stuck.

Moves the robot one square forwards, if there is nothing there. If that square isn’t empty, the robot does not move, so this method never causes a collision.

Controls the robot body’s actions for a single turn. If the brain considers the robot to be stuck (see isStuck), this method does nothing. If not stuck, the brain calls its own moveBody method, which carries out the actual robot actions.

Returns the direction this robot is facing in.

Determines whether or not the robot brain considers the robot to be stuck. A brain considers the robot stuck if and only if all the squares surrounding the robot contain unpassable obstacles, as defined by the mayAdvance method. Only the four nearest squares in the main compass directions are considered.

Returns the location of this robot in its robot world.

Returns the coordinates that point at the square that is immediately in front of this robot.

Changes the robot’s name to the given one.

Note to students: In Scala, a method whose name ends in an underscore and an equals sign — like this one’s — can be called using a special syntax. For instance, this method can be called either with the statement bot.name_=("Suzy") or simply with an assignment statement: bot.name = "Suzy". You won’t find many uses for this in O1, but it’s nice to know nonetheless.

Returns the brain of the robot immediately in front of this robot. The brain is returned in an Option wrapper; None is returned if there is no robot in that square or if the robot that is there has no brain.

Returns the square that is immediately in front of this robot.

Returns a textual representation of the robot (which is the robot’s name).

Returns the world that this robot is located in.