I assume the expanded version will be called SedanDeGraph.
—
Scott

> On Nov 4, 2020, at 10:09 AM, Roger Guay via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> 
> 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
> 
> Roger
> 
>> 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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