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OpenSource Web-Enabled Geographical Information System
Many clients, such as non-profit organizations, cannot afford the expense of a commercial GIS server, which typically costs in the range of $10k to $50k.
At Ocean Group, I built a technology-base comprised of reusable, OpenSource software
components, such as server-side JavaBeans and JSP template pages.
Below is an interactive demo of our most ambitious effort, which was re-purposing and extending a GIS Java Applet called OpenMap
as a scaleable and efficient Java Servlet component, thereby providing similar functionality to "MapQuest" or "Yahoo Maps", but at about one-tenth the cost of those commercial systems. The www.localharvest.org website makes use of this OpenSource mapping technology to put consumers in touch with organic farmers and farmer's markets in their local communities -- nationwide! Author: BBN Technologies/GTE (with significant changes/contributions by Daniel Kopyc while at OceanGroup)
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A "no-plugins" JavaApplet Movie Animator
A simple java-applet (originally Sun Microsystem's demo "Animator" applet) that displays a series of JPG images in rapid sequence along with an audio soundtrack. The original movie was captured on a Canon Elura DV camcorder, captured using dvgrab from the IEEE1394 project for Linux, and then the individual frames exported using a modified version of an "avi2pics" tool. Using this applet to view short movie clips has the advantage that it will work on any browser that supports any version of Java (since the applet is based on the JDK 1.0.2), so does not require the viewer to have RealPlayer, Windows Media Player, or any other proprietary multimedia player.
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JDK 1.3 Image Manipulation / Demo Servlet
A servlet that demonstrates the new, more sophistcated image-manipulation API available in JDK 1.3.
This "BrightenImage" servlet allows you to adjust the brightness on an image -- all computation is done on the server. Author: Daniel Kopyc |
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Linked List Simulator
A small "drawing tool" type of applet. You can add shapes ("nodes") to the
diagram, and link them together. The links are dynamically re-routed as nodes
are moved around. This applet could be used to demonstrate a linked-list navigation algorithm, for example. Author: Daniel Kopyc |
A Form Data Servlet
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A File-Echo Servlet
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The Form Data Servlet
and the File-Echo Servlet are two java servlets that simply echo back to the browser
either the contents of a file, or display data from an HTML "form". The file to be "uploaded" can be selected via a "browse" button on a form that then calls the servlet with a "POST" action.
This might not seem like much, but compared to writing the same CGI-functionality in Perl or C, these examples demonstrate how much cleaner the Servlet implementation is in Java. Future, more sophisticated versions of these applets would accept any type of file data, e.g. binary image data, but currently these simple servlets handle only single-part text data. It is quite a bit more difficult to parse the multi-part POSTs, although other folks have written class-libraries to do this (see links page). Author: Daniel Kopyc
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Java-to-JavaScript Communication Test
This page can be used to test browsers on different platforms and test whether or not JavaScript and the Java Virtual Machine on that platform supports communication between an HTML page and a Java Applet -- in each direction. This bi-directional communication is necessary for "remote scripting" applications to work properly on such a platform. There are many resources on the 'net for JavaScript, such as www.javascript.com. Author: Daniel Kopyc
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Simplest Audio
The simplest audio applet possible -- from one of the old Java Software Development Kit releases from Sun Microsystems, I think.
This applet simply plays an ".au" audio file when you click on the image. |
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Draw Test
The simple "drawing program" -- also from Sun's Java Software Development Kit.
This applet lets you draw straight lines or squiggles (points) with the mouse
in any of six different colors. Granted, it's not "Adobe Illustrator", but probably
has fewer bugs! ;o]. |
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Emblaze Video Demo
This is a demo of the "Emblaze" video streaming technology, which uses a small
applet (only about 40k!) to display a low-quality, yet viewable video clip embedded
in any web page. You can find more info on their site at www.emblaze.com. |
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Image Zoom Applet
This is an interesting applet from www.vivaorange.com. You can zoom-in by clicking the mouse on the image, zoom-out by
holding the "shift" key down while clicking, and pan around
to different portions of the image by moving the mouse (without clicking).
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Simple Servlet
Java Servlets are an exciting new technology that can replace CGI-scripts
written in other, messy little languages like "Perl". ;o]
This is the simplest servlet possible -- simply spits back an HTML page
that says "hello". Copied from the Java Servlet demo page.
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Magnetic Poetry
An applet demonstrating draggable "tiles", simulating the "magnetic poetry" game
found on so many refrigerator doors in the kitchens of the 90s-era enlightened fools.
Copied from the "Yahoo" java applets page (written by Nitric Interactive). |
