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). > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
