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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Client side (Applet) and Server side (Servlet) Graphics in Java

What is the current release of Java? Is it Java 1.6, Java 2 (1.6) or Java 6? Yes it is - they're all different names for the same thing!

Java started out as Java 1.0 ... and since code that would run on that Virtual Machine / written in that language will still run on today's version, it's still technically "Java 1". But would you seriously 'buy' a product that's not had a major revision in more than a dozen years? You would think twice ... and so it was that the marketing gurus switched to the "Java 2" name, and then to "Java 5" for 1.5 and "Java 6" for 1.6. And in some ways that makes huge sense beyond the marketing side too, because Java 6 is a very different beast to Java 1.0

Java 1.0's main use was in Applets - code running within a user's browser, sandboxed into an internal frame within a browser window and with carefully limited access beyond that frame. A very close parallel to Flash these days. But things have moved on ... Java has moved from browser / client side through to server side, where it's running complete applications (perhaps under Tomcat through the Servlet / JSP interface, tag libraries, Struts, Spring and the rest!)

From its early days, Java supported graphics through the AWT - Abstract Windowing Toolkit - a useful but low level interface. You call methods to paint with a Graphic object on a Frame object - methods with name like setcolor and drawLine and drawString. If you're working at this level, you'll be using pixel addressing so you'll find that you're providing your own utility methods with names like toXPixel and toYPixel - mapping world to screen coordinates; there's an example of such an applet here.

So is such graphics useful now that most Java runs on the server? It turns out that yes, it is!. As well as working on a Frame within a browser window, Java can work on a psuedoFrame in memory ... and then that frame can be stored as - for example - a .jpg file. We have an example of such a Servlet (for that's what it is) here. Technically, it uses a BufferedImage object, on which you run a createGraphics - it took me a while to work out the first time, but the example I'm pointing you at (link on "here") has all the hard word done for you and produces a graphic of data that the server extracts from MySQL database table. A truly 'put it all together' application!
(written 2009-06-17, updated 2009-06-22)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Q913 - Object Orientation and General technical topics - Computer Graphics Principles
  [2633] Why do I teach niche skills rather than mainstream? - (2010-02-13)
  [2758] But what will you DO with all those pictures? - (2010-05-09)
  [2992] Matplotlib - graphing in Python - teaching examples - (2010-10-10)
  [3049] Computer Graphics is fun - even if Java Applets are Old Hat - (2010-11-13)
  [3148] OpenGL / C / C++ - an example to get you started - (2011-01-26)
  [3211] Computer Graphics in PHP - World (incoming data) to Pixel (screen) conversion - (2011-03-24)
  [3261] Scalable Vector Graphics - easy, low bandwidth, high resolution, dynamic. - (2011-04-23)
  [3262] Some SVG Elements, pixel and percent positioning - (2011-04-24)

J953 - Combined Java Web Example: Servlets, JDBC and Graphics
  [1466] Effective Java training - the bootcamp approach - (2007-12-09)

J807 - Java - Images
J802 - Java - Abstract Windowing Toolkit
  [1325] Java - Client side applet applications as well as server side - (2007-08-29)
  [2649] Length, size or capacity in Java? - (2010-02-24)
  [2654] Java - from applets to servlets. JSPs and more - (2010-02-27)

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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