[NCLUG] GD Charting Tutorials

[Dave Treece]

Curiosity getting the best of me, but can anyone recommend a good book 
or web site that can explain in somewhat basic terms the process of 
building charts? Generally I'd like something that referenced the use of 
GD, but, really that shouldn't be necessary. I know there are lots of 
libraries out there, but I'd really like to get into the nuts and bolts. 
For example, given a set of data points, how do you map all that into a 
specific area, define they limits, scale the data into those limits, 
define a viewport, extents, etc. I guess I'm looking for some basic 
concepts that could be applied to just about any language with 
graphical/charting capabilities. I used to have a book that defined some 
of these concepts and for the life of me I cannot find it anywhere in my 
library and I've yet to find anything on Amazon, or the web the just 
does that.

Any Ideas?
--
   Dave Treece
   
   <incredibly philosophical sig under construction>