Demo Applets of MJ

• Drawing tool
• Coffee cup

Drawing tool

Abstract

As an example of a typical object-oriented application, we implemented a drawing tool, by which the user can draw figures such as circles and rectangles. This program is extensible by adding extension modules. Extension modules can add new kinds of figures or new kinds of operations to the figures.

Currently, the following 11 modules have been implemented.

• base : Framework of this tool
• select extends base : Selection of a figure
• delete extends select : Deletion of a selected figure
• move extends select : Moving of a selected figure
• dump extends base : Dumping of information of the displayed figures
• area extends base : Display of the total area of the displayed figures
• line extends base : Lines
• rect extends base : Rectangles
• elli extends base : Ellipses
• tri extends base : Triangles
• oct extends base : Octagons

Screenshot

This is a screenshot of the drawing tool incorporating all modules currently implemented.

Applets

The following are some of the possible combinations:
(If you are using the Netscape browser, the first applet loaded may be cached. To load another applet, restart the browser.)

1. { base }
   
2. { base, line }
   
3. { base, line, rect, elli, tri, oct }
   
4. { base, line, rect, elli, tri, oct, select }
   
5. { base, line, rect, elli, tri, oct, select, delete }
   
6. { base, line, rect, elli, tri, oct, select, move }
   
7. { base, line, rect, elli, tri, oct, dump }
   
8. { base, line, rect, elli, tri, oct, area }
   
9. { base, line, rect, elli, tri, oct, select, delete, move, dump, area }
   

Source code

DrawFrameMJT.txt

Coffee cup

Abstract

This is a simple applet demonstration program: "I-appli" (Java for NTT DoCoMo cellular phones), where a coffee-cup moves with the arrow keys.

This program consists of the following 5 Modules:

• base : The framework
• cup extends base : Drawing of a coffee cup
• multi extends cup : Drawing of a cup with many cups fading along the path to the left
• vapor extends cup : Drawing of vapor
• time extends cup : Drawing of a digital clock

Applets

Three modules (multi, vapor and time) can be arbitrarily selected.
The following are some of the possible combinations:
(If you are using the Netscape browser, the first applet loaded may be cached. To load another applet, restart the browser).

1. { base, cup }
2. { base, cup, multi }
3. { base, cup, vapor }
4. { base, cup, vapor, multi }
5. { base, cup, vapor, multi, time }

I-appli

Only for Japanese NTT DoCoMo cellular phones.
demo/i/index.html

Source code

• Source code for I-appli
• Source code for Applet