Homework 6 - Virtual Pest (part 2) by JLPopyack & Paul Zoski Due Date: Wednesday, November 20 at Midnight Late Due Date: Friday, November 22 at Noon

PURPOSE:

After completing this assignment, you will have use interface design methods while working on your "virtual pest." You will also have experience building(virtual) logic circuits

THE ASSIGNMENT:

This assignment consists of three sections:

1. Suggested problems (not to be turned in) from the text.
2. Written problems to be turned in.
3. A design project (Virtual Pests).

1. Suggested Problems (from the Decker & Hirshfield text):
   

   Module 6, pp. 231 - 232, problems 11, 13, 15

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2. Problems to be turned in:
   

   1. (9 points) Construct truth tables for P + Q', Q'+PQ, and (P'Q)'.
   2. (10 points) Suppose you had three inputs, say P, Q and R. Write truth tables for (P AND Q) OR R and P AND (Q OR R).
   3. (10 points) Using the truth tables you created above, build logic circuits for (P AND Q) OR R and P AND (Q OR R) using the Logg-o tool provided on the Analytical Engine CD. Provide screen shots of your working logic circuits.(Similar to those in the lecture notes).

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3. Virtual Pests, part 2:
   

   In the previous assignment , you created a design for a "virtual pest". Your design consists of

   • a user interface in the form of an HTML web page featuring form elements and pictures
   • a finite-state machine describing
     • the various states in which your pest may find itself,
     • which states are directly reachable from each other state,
     • "transition rules" describing what causes the system to change from one state to another.
   • a behavior specification showing in more detail how the pest's state is displayed on the user interface, how the owner's actions affect the pest, etc.

   For this exercise, you are to implement the user interface (often referred to as a front end) and submit a program design for the HTML/JavaScript code necessary to implement your virtual pest. NOTE: You do not need to complete implementation of the pest for this assignment; you need only specify the code that needs to be written, as described below.

   USER INTERFACE:

   You are to create a user interface you described in your previous assignment, as a web page consisting of at least one HTML form with at least two text boxes, two buttons, and some pictures. You must have a different picture to represent each of the different states that your pest can have. You may choose to include other form elements (pop-up menus, radio buttons, etc.) for extra credit.

   You need to provide a brief written description on a separate sheet of paper that describes how the interface works. Think of this as a "user manual" for your virtual pest.

   You should endeavor to match the original design as closely as possible - if you have decided to change or improve your original design, you need to describe the improvements in your user manual.

   PROGRAM DESIGN:

   Note that you are also to provide a preliminary program design for your virtual pest. The design must be done before you try to write the code. The program design contains the names of all functions you need to provide. It also provides verbal descriptions (not "JavaScript code") for each of the functions - what the function does, what form elements does it change values for and under what conditions?

   Your program should contain a "startup" function that is invoked when the page is loaded and which sets the initial state. It should also have a "display" function that changes values of form elements as appropriate according to the state. It should have a function that investigates the current state periodically (cycling by using "setTimeout()" as explained in lecture) and makes state transitions as described in your design. It should also have a function for each button you defined, which investigates the state and makes state transitions as described in your design. Each time the state is changed, your program will call the "display" function to update the form elements as needed. For instance, for the example given with Part I, illustrated through the finite state machine and behavior table shown below, there will be the following functions:

   • "Display" which shows the value of the state, changes the value of "pet action" to "Wag Tail" or "Bite" as appropriate, changes the value of "pet sound" to "Grrr..." or "Woof woof" as appropriate, and changes the pests picture to go with it's current state.
   • "Initialize" which is run automatically when the program is loaded, sets the state to "happy", then calls "Display".
   • "Simulate" which examines the state, generates a random number, updates the state as appropriate, then calls "Simulate" again using the "setTimeout" function.
   • "Pat" which is run when the "Pat Dog" button is pressed, updates the state as appropriate, then calls "Simulate" again using the "setTimeout" function.

    

   

   Element	Type	Possible values	Meaning	Action
   PetSound	text box	Grrr... Woof woof	state=angry state= lonely
   OwnerHand	button		pat the dog	changes state to "provoked" if angry, and to "happy" if lonely.
   PetAction	text box	Bite Wag Tail	state=provoked state= happy
   ...	...	...	...	...

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4. Extra Credit

   Students wishing to earn extra credit can do so by completing as many of the following additional tasks as desired:
   

   • (5 points) Use AND, OR and NOT gates to construct a circuit with two inputs, P and Q, and one output Z, that obey the following truth table:

     P	Q	Z
     1	1	0
     1	0	1
     0	1	1
     0	0	1

   • (10 points) Use AND, OR and NOT gates to construct a circuit with three inputs, P, Q, and R, and one output Z, that obey the following truth table:

     P	Q	R	Z
     1	1	1	1
     1	1	0	0
     1	0	1	1
     1	0	0	0
     0	1	1	0
     0	1	0	1
     0	0	1	0
     0	0	0	1

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WHAT TO TURN IN:

All work is to be submitted electronically via WebCT. It is suggested you complete your work early so that a TA can help you if you have difficulty with this process.

• Submit an electronic copy of your answers to "Written problems to be turned in."
• Print out a grade sheet using our grade sheet generator and submit it to your TA in lab (even if you have not submitted your assignment yet). Your TAs will record your grades and comments for you, and return the sheets to you the following week.
• Submit an electronic copy of a word document contain the design specifications for your virtual pest.

ACADEMIC HONESTY:

You must compose all written material yourself, including answers to book questions. All material taken from outside sources must be appropriately cited. If you need assistance with this aspect of the assignment, see a consultant during consulting hours.