Part 2
Once you get the basic version
working, we would like you to jazz it up a bit. Here are the
extensions we would like you to make:
- Add labels (Text items) at the bottom of the picture showing
the number of correct and incorrect placements. This makes it
clearer when the student succeeds in placing the item correctly.
They should read something like "correct = nn", "incorrect =
mm". The value in the first Text item will be formed by
concatenating the string "correct =" with an integer instance
variable which keeps track of the number of correct answers. The
other is similar.
- Users should drag the items to the correct laundry basket
rather than just clicking on the basket. Recall from the example
in class that you will need an instance variable to label the last
mouse position before the drag so you can determine how far to
drag the item. If the user presses the mouse button down outside
the laundry item, it should not increase the correct or the
incorrect counter.
- Assign the item a randomly generated color by randomly
choosing integers redNum, greenNum, and
blueNum between 0 and 255 for each of the red, blue, and
green components of the color. You can create a color from those
components by writing new
Color(redNum,greenNum,blueNum)).
Now define criteria for determining where each color
should go. The simplest criterion is based on the sum of the
three color components. If the sum of the component numbers is
less than 230, decide it is dark, if it is greater than 600,
decide it is white. Otherwise it is colored. After you get the
program working you might want to experiment with other criteria.
We will let you figure out most of the details of how to add the
features for the more advanced versions. One piece of advice is that
for the second enhancement you will be dropping the
onMouseClick method in favor of using the three methods:
- onMousePress - for when the user first clicks on
the item - though remember that they might miss.
- onMouseDrag - to do the actual dragging.
- onMouseRelease - check to see if they've dropped
it in the right place when the mouse is released.
|
Value | Feature |
|
| Style, Design, and Efficiency (10 pts total) |
|
2 pts. | Descriptive comments |
|
2 pts. | Good variable names |
|
2 pts. | Good use of constants |
|
2 pts. | Appropriate formatting |
|
1 pt. | Does not generate new objects unnecessarily |
|
1 pt. | Design issues |
|
|
|
| Correctness (10 pts total) |
|
2 pts. | Generates a new color swatch only if previous one
placed correctly |
|
2 pts. | Swatch displayed in the correct initial position;
returns to original location if incorrectly sorted |
|
2 pts. | Updates number correct and incorrect properly |
|
2 pts. | Drags swatch properly (-1 pt if can use clicking instead
of dragging |
|
2 pts. | Appropriate behavior if user does unexpected things
like starting to drag outside the swatch |
|
|
|
| Extra credit (1 pt) |
|
1 pt. | Does not update either # correct or # incorrect if
user misses all baskets |
|
|
Be sure to do the basic version of the lab before attempting the more
advanced features. Just work on adding one feature at a time, testing
each thoroughly before working on the next.
Your program is due at 11p.m. on Tuesday evening. Turn in your
program as you did last week. Here are the instructions again:
- First, return to Eclipse and make sure you included your name
and course number in a comment at the start of the program.
- Next, click on the "Laundry" project in the Package
Explorer panel on the left side of the Eclipse window.
- Now, select "Export" from the "File menu.
- Select "File system" in the dialog box and click next.
- Click the "Browse" button next to the "To directory:" entry.
- Double click on "Home".
- Click the "Create Folder" button. Type in a name for the
folder. A good folder name is one that identifies you and the lab you
are working on, such as "Yourname-Lab2" or "Yourname-Laundry" and
then click "OK". (Dashes in names are OK, but don't include spaces
or periods.) Then click "Finish".
- Quit Eclipse.
- Double click on your Home folder. You should see the folder
you just created.
- Open a second window by double-clicking the cs051 folder icon
on the left side of the screen. Within the "CSC 051" folder you
should see a "dropbox" folder.
- Drag your new folder into the dropbox folder. When you do
this, the computer may warn you that you will not be able to look at
this folder. That is fine. Just click "OK".
- The new folder will still show up in your home folder. Drag it
into the trash both to save space and to keep anyone from copying it.
(Files in your CSC 051 folder are protected so that others cannot read
them.) Press the right mouse button on the trash icon to bring up a
menu and select "empty trash".
If you should accidentally turn in a bad version of your program, you
may drag another copy in as long as you change the name to be slightly
different from the one you used before (e.g. Jane Doe - lab 2a). The
new name should make it clear which is the newer version.
Good luck and have fun!
Computer Science
051
Department of Computer Science
Pomona College
