1. Karel J Robot

2. Karel J Robot
Karel provides an OOP approach to learning computer science
It provides visual feedback to students – you get to see your mistakes and triumphs.
It will cover some of the major CS concepts in a short period of time:
Inheritance, Polymorphism, Abstraction, Encapsulation, OOP-Design, Recursion, Iteration, Selection, …
Filters out many(relevant) details so one can focus on the major concepts:
Not in danger of losing sight of the Forest (computer science) through the details of the Trees (java details)

3. Karel J Robot It’s pure Java
It introduces many major topics in a short period of time – not too much detail
then, as the year goes on, we will spiral back through those topics introducing more and more detail as required
1st term timeframe which includes lectures, homework, labs, quizzes, and assessments

4. Karel's World Robot World
A flat plane of streets (east-west) and AVenues (north-south)
Streets
Corner (many robots may occupy)
Avenues

5. Karel's World
Bounded on west side by an infinitely long vertical wall and on south side by infinitely long horizontal wall
Streets and avenues have numbers
Corner is identified by street and avenue. Origin is street 1, avenue 1.
Position of robots and other things can be referred to by an absolute or relative location

6. Karel's World Contains Beepers and Walls Beepers Walls
Beep very softly. Robots cannot sense a beeper until they are on the same corner.
May be picked up, carried, and placed again
Several beepers can be placed on a corner and they don’t interfere with Robot movement
Walls
Placed half way between street corners
Impenetrable, blocks robots
Used to create rooms, mazes, hurdles

7. Wall Segments

8. Robot Capabilities Moves Turns Senses surroundings
Only moves forward in direction top of its head is facing
Turns
Turns 90 degrees to the left
Senses surroundings
Hears beepers (on same corner)
Determines direction it is facing
Picks up, carries, and puts down beepers
Turns itself off
I am facing West and have no beepers
I am turned OFF. I can’t do anything else.

9. Karel-Werke Factory - Builds the robots Factory – Delivers the robots
“factory” (auf Deutsch)
Factory - Builds the robots
Standard model
New model
Extension of an existing base model
Factory – Delivers the robots

10. Robot Tasks and Situations
Examples:
Move to a corner (3rd St. & 5th Ave.)
Run a hurdle race
Escape from a maze
Find a beeper and deliver it to the origin
Draw a pattern with beepers

11. Robot Tasks and Situations
Fig A: A room has one door. A robot is at the origin and facing North. Robot must enter the room.
Fig B: A diagonal line of beepers. Robot is facing East and must pick up all beepers.
Fig C: A “+” wall arrangement with beepers. From a starting position, Robot must pick up all beepers.
Fig D: Robot must escape the maze.

12. Robot Tasks and Situations
Fig E: Beepers are scattered in a box. Robot is facing South in the Northwest corner and must pick up all beepers in the box..
Fig F: Box with a beeper. Robot is facing North in the Northeast corner. Robot must find the beeper.

13. Karel Program

14. Using Eclipse Java Environment
Before you begin to write programs for Karel or Java, you will need to obtain a copy of Eclipse from website.
The process for downloading Eclipse depends on what system you are using.
The process may take a while, so be patient!

15. The Eclipse Interface

16. Coding Karel import stanford.karel.*;
public class OurFirstKarelClass extends Karel {
public void run() {
turnLeft();
move();
pickBeeper(); }

17. Defining new methods Yes you can define new methods for Karel
private void turnRight() {
turnLeft(); }