Problem Solving Assignment 8

Due: Tuesday, Feb 24th, 11:59 pm

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There are three problems in this PSA. Don't worry -- 2 of them you are just making small changes to some given code.

Note 1: Besides writing the code there is an interview process required for this PSA. Your interview is worth 10% of the PSA grade and is done individually.

Note 2: You will be required to submit your result from in the class wiki. This will count for 5% of your PSA grade.

This homework requires skills from all Chapters up to Chapter 6 and Chapter 8.

1. Resizing -- Alter these methods so that they accept a resizing of any size.
   • The user should be able to enlarge or shrink any picture by any amount.
   • You will complete a main application we provide to allow the user to interactively control shrinking or enlarging pictures (repeatedly).
2. Checking Boundaries -- Alter PSA5 so that the user can input any location and any size to flip and the program will not get an out of bounds error.
   • Using these methods, and this as your main method, allow the user to enter any coordinates and any size for the picture to flip. If they go out of bounds, make sure they are reprompted so that they have another chance to input their choice. They should still get 3 choices for horizontal flip and 3 choices for vertical flip.
3. Concatenating Sounds -- Using Sound.java, concatenate two sounds together.

Details

You must put a comment at the top of your code that specifies, for both you and your partner, your: real names, login names, and PIDs, And a two to four sentence description of the program (one description for each program).

Use a multi-line comment (/* */).

Comments are important. Code must be properly commented to receive full credit.

You must observe an 80 column limit. No line of your program may be longer than the 80th column on the screen.

Resize

For the following two methods, just alter these methods.
Method: Shrink

• To perform this project these are the minimal requirements.
• Add one method (to Picture.java) called shrink that takes in one paramter int factor that is the factor that the user wants to shrink the image by. This method should return the shrunken picture.
• The calling object should be the picture that is to be resized.
• Instead of shrinking by 2, this method should shrink by factor.

Method: Enlarge

• To perform this project these are the minimal requirements.
• Add one method (to Picture.java) called enlarge that takes in one parameter int factor, which is the factor that the user wants to enlarge the image by. This method should return the enlarged picture.
• The calling object should be the picture that is to be resized.
• Instead of enlarging by 2, this method should nelarge by factor.

Testing your method (in an application):

• Create a new file called PSA8A.java where you will write an application to test your methods. Start by copying in this code.
• Using the above methods for resizing pictures, you will resize the picture according to what the user asked.
• The PSA8A.java provided to you above has a description of what you need to add. NOTE: Remember to keep a loop going you could have a boolean variable that was checked each time. For example, if you want to loop until the user enters "done", first, declared boolean done = false then loop while(!done), finally, once the user enters "done", this method should done = true; so that it can break out of the loop.
• Lastly, You must post your resulting images on the wiki AND include the hyperlink to your wiki submission in your PSA8 comments. You should post 3 images; the original, a shrunken version that has been shrunken by a factor other than 2, and an enlarged version that has been enlarged by a factor other than 2.

Checking Boundaries

Testing your method (in an application):

• For this part of the assignment, you will use these methods in Picture.java, and only make changes to this file.
• Find a way to alter PSA8B.java in order to allow the user to input ANY numbers for a box to flip.
• For example, if the user input 2,5,100, your program should print: This range is out of bounds. Please choose a range that is within (0,0) and (width,height), where width and height are the actual width and height of the picture chosen to alter.
• If the user enters constraints that will not cause an out of bounds error, then flip that portion of the picture and continue.
• If the user enters constraints that will cause an out of bounds error, then reprompt them. This should not count towards the 3 flips for each vertical and horizontal. There should still be a total of 6 FLIPS; 3 horizontal, 3 vertical.

Sound Editing

Method: concatenation

• This method will modify the calling object and the calling object will be assumed to be a silent wave file (there are two in your mediasources directory - sec1silence.wav and sec3silence.wav - and you can create others). It will take as parameters Sound a, Sound b, and an integer "switchPoint" which denotes the frame at which to switch from a to b.
• The method will overwrite the calling object with Sound a, then with Sound b. You will switch between a and b when either Sound a finishes or when you hit the switchPoint (whichever is earlier). You will then (either at the switchPoint or the end of Sound a) begin Sound b. (Your code must support the switchPoint being before or after the end of Sound a, regardless of how you use it when testing.)
• If the length of Sound a and Sound b is less than the length of the calling object your program should not fail and should leave the remaining portion of the calling object as silent.

Testing your method (in an application):

• Create a new file called PSA8C.java where you will write an application to test your methods.
• Your application will do the following:
• Open three Sound files (one of which is silence) and play the two Sound files which are not silence using the method blockingPlay().
• You will then call concatenation using those three files. Play the resulting Sound using the blockingPlay() method.
• IMPORTANT In order for the grader to grade your submission your code must work with different paths. To obtain each media file, do NOT use the file path or MediaPath functions. Copy the sounds you want to use for your final submission into the same folder as your code and rename them Sound1.wav, Sound2.wav and Sounds3.wav. Then ensure that the file path is simply "soundname.wav". For example, if you want to use test.wav, use
• String fileName = "test.wav";
• Sound s = new Sound(fileName);

How to turnin your homework electronically

Before turning in your files, rename all of the sounds you wish to use in this assignment Sound1.wav, Sound2.wav, etc for all sounds you are submitting. If you name them anything else, they will not be collected or turned in.

When you submit, the bundle script will be expecting 10 sounds, if you only have 3 this is OK. You will get a warning saying you are missing files, but as long as you are sure you included all of the sounds you wanted to include, and as long as it says you aren't missing any java files, it it ok and you will not be marked down.

When you are ready to turn in your homework, first open a terminal window by right clicking on the empty area of your computer's desktop (have to use lab computers or remotely connect from your home computer using SSH or Putty) and select "Open a New Terminal". Then, run bundlePSA8 from your PSA8/bookClasses directory. Files are required to be submitted for PSA8:

• Picture.java
• PSA8A.java
• PSA8B.java
• PSA8C.java
• Sound.java
• Any wavs you use in your assignment (should be named Sound1.wav, etc)

If you don't have one of these files present or have misspelled the name of one of these files, the bundle script will complain! Here you can see how you can run these commands:

-bash-2.05b$  cd ~/PSA8/bookClasses 

-bash-2.05b$  bundlePSA8 

Good; all required files are present:

        Picture.java
        PSA8A.java
	PSA8B.java
	PSA8C.java
	Sound.java
	Any wavs you used (should be named Sound1.wav, etc)

Do you want to go ahead and turnin these files? [y/n] y

OK.  Proceeding.


Performing turnin of approx. XXXX bytes
Copying to /home/linux/ieng6/cs8f/turnin.dest/cs8wxx.PSA8
.
Done.
Total bytes written: XXXX
Please check to be sure that's reasonable.
Turnin successful.

Make sure the Turnin is successful, otherwise we won't receive your submission! . If you want to make changes after you've turned in your homework, make the changes and run bundlePSA8 again. The program will warn you that a "previously turned-in file exists" and ask if "you wish to over-write this existing file". Respond in the affirmative by typing y and pressing the Enter key.

Getting your interview done INDIVIDUALLY

10% of your grade on this assignment will come from an interview you will have with one of the tutors during Open Lab Hours. You have 48 weekday hours after the electronic turnin deadline to get your interview done. The deadline for the interview for PSA8 is Thurs Feb 26th (theoretically at midnight, but actually by the end of the last tutor hour scheduled). Remember, the tutors may be busy after 4pm helping CSE8B students

You get an interview by going into B260 during a scheduled tutor hour. Find the tutor, ask them if you can interview for the 8A PSA. If they have others who are waiting for interviews, your name will go on the end of the list of people waiting. Interviews take about 5 minutes each. It is your responsibility to go in early enough that you can get your interview completed. If everyone waits until the last hour on Thurs, this will not work.

For the interview you will need to have a copy of your team's assignment in your account. If you are using your partner's account to submit the files, make sure you email them to yourself and save them under your account so that you have them available for the interview. The tutor will ask you to log in, change to the directory where your work is and then to follow their directions. They will ask you to run your program to show that it works, open files in Dr. Java (or your favorite editor), and ask you questions about HOW your code works. Additionally, they may question you as to how you would (theoretically) make small changes to the program to have it do something slightly different. You will not actually be required to change your code.

Learning to be able to explain your problem solving process and discuss code with another human being is a very important professional skill. We hope that this process will help you develop this skill.