Graphics in Lua - an example using the gd library

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For 2023 (and 2024 ...) - 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 Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own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))

Graphics in Lua - an example using the gd library

In answer to the question "how would you generate graphics from Lua?" ... I would (personally) look at a binding to the gd library - http://luaforge.net/projects/lua-gd/ - as this is an excellent library, under the MIT license so there's no issue with ongoing licensing being different to Lua's.

This image is an example produced using the gd module within Lua. The principle is that you create an image using gd.create which returns a table on which you run various methods such as colorAllocate and fillRectangle ... before finishing with a method such as jpeg or png to output the Image.

The complete source code of the program I used to generate the image that illustrates this article is on our web site here. We will give you a brief introduction on our public Lua course; Computer Graphics (and the GD library) are something of a speciality of mine, so if you need to know more, please ask for an "extra day" or alert me ahead of time on a private course, and I'll be delighted to cover the topic!

For graphs (as opposed to graphics), look at http://luagraph.luaforge.net/ which is a binding to the Graphviz library. And there are also OpenGL, SDL and .pdf bindings ... see http://lua-users.org/wiki/LibrariesAndBindings
(written 2009-08-02)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

U118 - Lua - Resources.
  [1111] Training in Lua - (2007-03-16)
  [1695] Lua Course - here is the index - (2008-07-03)
  [1847] Lua - IAQ (Infrequently Answered Questions) - (2008-10-18)

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Some other Articles

Java Collection Objects in the java.util package
Looking for a practical standards course
Uploading and Downloading files - changing names (Perl and PHP)
Helping new arrivals find out about source code examples
Graphics in Lua - an example using the gd library
For Lua Programmers AND for Town Planners
How to make a Risotto (PHP build style)
Guadalajara - a special tour of a lovely city
New Lua Examples - for last weeks delegates
Passing parameters to a coroutine in Lua

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