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mazewalker [2019/08/29 23:24]
frchris
mazewalker [2019/08/29 23:59] (current)
frchris
Line 1: Line 1:
-Write an instruction ''​followWallRight''​ for the ''​MazeWalker''​ class, assuming that whenever a robot executes this instruction there is a wall directly to the right.  ​ +Write an instruction ''​followWallRight''​ for the ''​MazeWalker''​ class, assuming that whenever a robot executes this instruction there is a wall directly to the right.  ​It should be able to handle these four possible situations
-{{::​maze_moves.png|}}+
  
-Here are four of the different position changes that the robot must be able to make.  This instruction is the cornerstone for the program that directs a robot to escape from a maze.  It isn't the most efficient algorithm, and it won't work on mazes that have islands (Can you imagine why?​). ​ Do you think following the left walls would be better? ​+====== Before ======
  
-{{ ::mazewalker.java |MazeWalker.java}}+{{::turnrightbefore.png|}} 
 +====== After ====== 
 +{{::​turnrightafter.png|}} 
 + 
 +These four different position changes is the cornerstone for the algorithm that directs a robot to escape from a maze simply by following the right wall.  It isn't the most efficient algorithm, and it won't work on mazes that have islands (Can you imagine why?​). ​ Do you think following the left walls would be better?  
 + 
 + 
 +<​code ​java
 +import kareltherobot.*;​ 
 +public class MazeWalker extends Robot 
 +
 + 
 + public MazeWalker(int street, int avenue,  
 +                       ​Direction direction, int beepers)  
 +       { 
 + super(street,​ avenue, direction, beepers); 
 +  
 + } 
 +    /** 
 +     * This is an algorithm to run a maze. It isn't the fastest method, 
 +     * and won't work if the maze has any islands (Can you imagine why?) 
 +     * Would it be better to follow the leftWalls?​ 
 +     */ 
 + public void escapeMaze() { 
 + while (! nextToABeeper() ) 
 + followRightWall();​  
 + } 
 +    /** 
 +     * This will move the Robot according to the diagram 
 +     * above. ​ Use if () else statements to handle the 4 cases 
 +     */ 
 + public void followRightWall()  
 +
 +  
 +
 + 
 + public void turnRight() { 
 + for (int i=0; i<3; i++) 
 + turnLeft();​ 
 +
 + 
 +
 +</​code>​ 
 + 
 + 
 +First use the ''​MazeWalkerTester''​ to see if your code deals with the four situations correctly.
    
 {{ ::​mazewalkertester.java |MazeWalkerTester.java}} {{ ::​mazewalkertester.java |MazeWalkerTester.java}}
Line 11: Line 55:
  
 {{ ::​mazewalkerrunner.java |MazeWalkerRunner.java}} {{ ::​mazewalkerrunner.java |MazeWalkerRunner.java}}
 +
 +Hints:
 +  * Case One check: is the front clear?
 +  * Case 2,3,4 you can move
 +  * Case 2 versus case 3,4: is there a wall on the right?
 +  * In case 3 and 4 you can move to the right.
 +  * Case 3 versus case 4: is there a wall on the right?
mazewalker.1567135452.txt.gz · Last modified: 2019/08/29 23:24 by frchris