Lovebot

Moves the robot. A lovebot tries to home in on its beloved unless it already is in an adjacent square (diagonally adjacent is not good enough). The lovebot blindly follows its primitive urges and doesn’t know how to avoid obstacles. If there is a wall or another bot in the chosen direction, the lovebot will collide with it (as per the moveTowards method of its body, possibly colliding and breaking itself or another robot).

The path of movement is chosen as follows. First the lovebot calculates its distance to its target in both the x and y dimensions. It moves one square at a time so that either the horizontal (x) or the vertical (y) distance decreases by one, choosing the one that is greater. In case the distances are equal, the horizontal distance is chosen. The lovebot only moves one square per turn. It turns to face the direction it attempts to move in, even if that attempt fails because of a collision. The bot does not turn or move if it is already close enough to its beloved.

This method assumes that it is called only if the robot is not 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.

(Note: This method only moves the robot in case the square in front of it is completely empty. This method does not call mayMove and is not affected by that other method’s implementation in any way.)

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 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 obstacles, as defined by the mayMove method. Only four squares are considered: the nearest square in each of the four main compass directions.

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.

Checks the square that neighbors this robot in the given direction to see if it contains something that the robot brain considers an obstacle. This method is abstract; different kinds of robot brains will have different definitions of what counts as an obstacle.

This default implementation (which may be overriden by subtypes) does not consider anything to be an obstacle. Robots that rely on this default implementation are willing to move in any direction and never consider themselves to be stuck (see isStuck).

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.