The code for the game has been divided into a collection of individual
files, but for convenience there is a single "master file" called
game.scm which loads all the others in. The first thing
you should do is to copy the whole collection of files, so that you
will be able to modify any of them as the need arises. If you add any
additional files (for example, for newly added classes), you should
extend your copy of
game.scm to load in the new files as
To make a copy of all the files, the simplest approach would be to use the shell to copy the whole directory containing the files. If you are in a shell window, type:
cp -r ~mc28/labs/gack/gack .(note that this command ends with a space and then a period), you will get a subdirectory called gack containing all the files. Ask for help with this if you need it.
You should open your own copy of
game.scm in DrScheme.
To play the game, press the Execute button in this window and then
(play) in the associated interaction window.
If you want to edit one of the other files, open it up in its own
window in DrScheme, make your changes, and save the file back out.
But don't press the Execute button in that window.
Instead, press the Execute button back in the window that holds
Following are links to the various files that comprise the program, together with short descriptions. These links should be useful when you are programming, since you will typically be working on one of the class files, but will need information about various other classes or utility procedures.
(go north)instead of
(person/go player 'north):
Once you have copies of the files made and loaded in, you are to do exercises 14.33, 14.34, and 14.35, on pages 568 through 570. In coming up with ideas for the open-ended exercise 14.35, you may also want to look at exercise 14.42 on pages 572 and 573.
For the open-ended exercise, be sure to make changes which require some change or addition to the class hierarchy, some additional method, and some additional instance variable.
Our implementation of the object-oriented programming system contains
two useful procedures, not mentioned in the text, called
(oops-describe arg) will give a reasonable
arg even if
recursively contains itself.
oops-display is the one that the
object/describe method uses for displaying each of the
instance variables values in a summary form -- for example
object of class witch] or
[a 3421 element
vector]. The procedure
oops-display the first few elements of a
3421 element vector followed by
Both procedures are useful when debugging, when you don't know for sure in advance what type of value you are going to encounter (because the bug may be precisely that you have the wrong type, for example the person object rather than the symbolic name of the person).
Your audience for this report is a fellow programmer (or team of
programmers) who will be extending your game. You can assume
the audience knows Scheme and the
from the book, but is not familiar with The Land of Gack. All aspects
of your report, including the
introduction, should be addressed to this audience. (If there are
comments that you wish to make to the grader, you can put those in an
appendix.) As always, your report should focus on what the final
product is, and not on the assigment. Sentences starting, "We were
asked to..." and "The first thing we did in lab is..."
should not appear in your project report.
You'll want to briefly describe your game to the audience (with emphasis placed on those parts that differ from the original version.) One thing I'll be looking for is a clear description of your final class hierarchy early in the report. (A diagram helps!) As always, emphasize the final product rather than each incremental change you made. Make sure that your English text provides context for the Scheme code rather than echoing it; after all, the reader can read Scheme code.
Suggest one or two specific further improvement(s) to the audience. Clearly explain how components of the program will need to be adapted to incorporate these improvements. I'd rather you explain one suggested improvement in detail than explain several vague ideas. For instance, the programmer may need to
One way to sketch your idea is to specify the information required by
define-class in any new classes, or changes required to
define-class in existing classes. You should specify
any arguments and return values for new methods.
Although you need not provide explicit testing information in this report, you are expected to adequately test the code you wrote. If your program has bugs, provide a bug report.
The gradesheet for the project is available in PostScript or PDF format. (If you print a copy out, you can staple it to the front of your project report to save paper.)
~max/public/178/submit *.scmPlease print out your project report and submit it in class. Your project report should not include all your code.