[NCLUG] GD Charting Tutorials

[Dave Treece]

Well, again, I'm not looking for just another library. I'm looking for a 
half decent tutorial that says for this set of data, your y axis 
coordinates can be calculated as such, a point on the y-axis can be 
calculated in this manner. At one time I had a book (or maybe manual 
that showed a graphic context (with gd you have a context with a given 
width X height with 0,0 being the top left) and the manual had a good 
explanation of how to fit a set of data within that graphic context. 
Such that given a range of number (say 1 to 10) and a height of 100 
(assuming 100 pixels) there must be a simple, possibly graphical, 
explanation of how to fit that data onto that graphic context. Don't you 
think?

Michael D. Wailes wrote:
> Have you looked at protocharts?
>
> Dave Treece wrote:
>> 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>
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