Hi Alex,

Thanks for your continued interest in my little project. I have succeeded in 
implementing a multiple polygon approach, but it ain’t elegant as they say!

I seem to recall that I learned a lot from your GraphMaker some time ago, but 
as I try to review your latest on your website, I run into repeated errors 
about “can’t find handler gmSetCustomMarker”. I can’t seem to make any headway 
to resolve this. Am I supposed to do something with the “Library”? I could not 
find instructions anywhere. 

Meanwhile, I should explain further that I am trying to expand on a stack that 
I built 2 or 3 years ago called CoupDeGraph which you can find in the Example 
Stacks of LiveCode. Put simply, I am currently trying to expand on CoupDeGraph 
to be able to handle double-valued equations.

Again, thanks for your help


> On Nov 3, 2020, at 4:48 PM, Alex Tweedly via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> On 31/10/2020 02:28, Roger Guay via use-livecode wrote:
>> Lots of clever ideas here, Alex, but I think you’re missing the point of 
>> what I ultimately want to do. I'm building a plotting program for which I 
>> want to plot any equation including those that have multiple values of y for 
>> a given x. An equation might branch at any point and might even have 
>> multiple branches both of which are unknown before plotting.
>> Of course, there’s always the possibility that I’m not fully comprehending 
>> your suggestions??? What does NB stand for? Are you suggesting creating a 
>> new polygon every time a branch is detected? That just might work?!
> Hi Roger. You're right - I missed the point; I jumped to the assumption that 
> you were asking about a fairly small, specific issue - so leapt too quickly 
> to a code sample. But before I address the general question(s), let me get 
> the little points out of the way :-)
> NB - sorry, kind of common usage in British English. Actually, it's from a 
> Latin phrase - "Nota Bene" - meaning "note well". So basically just 'take 
> note of'.
> "a new polygon every branch" - yes, perfectly possible. Also possible is what 
> I did in the first case of the code sample -  a new 'sequence of points' for 
> each branch, and then stitch those together (with blank lines between) into a 
> single polygon; but that's, for now, a detail.
> The essence of the problem is that your app will (somehow) develop a number 
> of 'sequences of *data* points' - and then those need to be translated into 
> equivalent sets of *display* points (by either a plotting library, or by your 
> own code) to allow it to be displayed appropriately.
> There are at least two possible plotting libraries that might do what you 
> want (or do something close enough that they could be useful). By 
> coincidence, they were both discussed at the San Jose LC conference in 
> 2019.If you have access to the video / papers from that you might already 
> have some of the info you need; I don't know if the conference papers are 
> ever put out for more general usage later.
> Option A. Monte described a wrapper for the JSPlot library. It's a very 
> powerful library capable of many kinds of graphs / plots, and very quick and 
> capable. The most obvious downside is that it needs to be used within a 
> browser widget - but well worth looking at it if you can.
> Option B. I did a library called "GraphMaker" - a pure-Livecode plotting 
> library. It is (I think) fairly easy to use - but that may not be the case 
> for someone else coming to it new. I know it can handle this case of 
> bifurcating plots (using multiple sequences of data points). The conference 
> slides were a decent, if very brief, introduction; the lengthier 
> documentation was, maybe, not quite complete. However, it does come with a 
> demo app that uses the library to draw a variety of graph types. Main 
> advantage is it's pure LC, and hopefully easy to use - both in understanding 
> and in ease of integration into an app (you just create a suitable group to 
> contain the graph, set its rect properly and pass in all the point data along 
> with various parameters.  It has nowhere near the coverage of different graph 
> types that JSPlot does - it's basically line, bar and scatter plots, with 
> primary X-axis, and can have shading, etc.
> Option C. Roll your own.
> I'd certainly suggest investigating the use of an existing library first. 
> There's quite a lot of effort needs to go into determining how to scale the 
> data to the space available, how to label the axes, how to add tick marks, 
> grid lines and (perhaps) multiple Y-axes. That stuff probably accounted for 
> 90% of the effort of creating the library.
> If you'd like to try out my library, the latest version can be found at
> https://www.tweedly.org/lcms.lc/GraphMaker
> (sorry - I haven't formatted it into my usual download structure - so this is 
> simply a page that gives links that allow you to download the 2 files you 
> need and 2 more files you don't need.)
> Of course, I'll be happy to help out in any way I can with it.
> Alex.
> P.S. the demo app includes an example of a 'branching' plot (Graph 3).
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