Some image editors have an option for this purpose. But for a general solution, you can use the xwd utility. You call the program as "xwd -out image.out" and click the window you want. The program dumps the raw image of the window into the file given as the parameter. However, the image files created with the previous command are too big. It is preferred you submit your image in a format such as gif or jpeg. The following command will save the snapshot as a gif file.

xwd | xwdtopnm | ppmquant 256 | ppmtogif > image.gif

The input matrix file has been modified to include one extra line in the beginning to give the coordinates of the goal position. You should not embed the goal position into your source code because your program will be tested with different goal positions. Read the answer below for more details.

You may store all the values but just print the last, say 10 or 20, ones recorded near the wall. There is no point to print 100 values if all of them are near 0. You only need to concentrate on the part where the sensor values change. Instead of a tabular output, you may also use some kind of graph to plot these values. Then, you should not have a problem fitting the graph to the panel.

You will submit your answers in a file as described in the submission procedure below. No hard copy is required (save the forests :)

You will create a directory structure but a little different from the first assignment. This time, name the uppermost directory using last four digits of your Social Security Number. If your SSN is 123-45-6789 than name the directory 6789. In this directory put a readme file including your name, your SSN, the environment you tested your programs (the properties of the machine and the operating system used) and any other relevant information that is necessary to run your programs. Then create a directory structure for each part of the assignment; namely "Part1", "Part2" and "Part3". Each directory will have a Makefile and a directory named "USER" containing your code for this part ("user.c", "user.h", "user_info.c"). You can add a readme file to these directories if there is something you want to say about that part.

The answers for the written questions will also be submitted in this directory structure. In the uppermost directory create one file named answers.[txt|ps|pdf] containing your answers for the written questions. No special format is required for this file. You may just create a plain text file or use a program to create a PostScript or PDF file. Do not forget to include any image files in your document (or as a separate file).

After you are done, create one compressed file (using zip, tar.gzip, etc) containing all the files in the directory structure as described above. Name the compressed file using last four digits of your SSN. If the uppermost directory created was named 6789 then name the compressed file 6789.tar.gz (or 6789.zip if you are using zip)

Assignment is due by Tuesday, April 30. For this assignment you have time until midnight, this means you should submit your assignment before 11:59pm on Tuesday.