PlotJuggler VS uPlot

If you use ROS, you will have similar facilities with ROS bags and e.g. PlotJuggler. ROS bags are not as convenient to manipulate as MessagePack/JSON dictionaries, although they hold similar data, because the ecosystem is smaller (i.e. less people manipulating them and developing tools to manipulate them more efficiently).

I can also recommend using Plotjuggler instead: https://github.com/facontidavide/PlotJuggler

This is great!! Also see the open source plot juggler (not mine) https://www.plotjuggler.io/

If you want to visualize data on the plot I would recommend using PlotJuggler. Great piece of visualization tool working with ROS. It is available as snap package, so it will be easy to set up. Here's the link with all the details: https://github.com/facontidavide/PlotJuggler

For work sometimes I will use a program called PlotJuggler, where there is a splash screen but it is just a couple seconds of displaying a random, plotting related meme.

Based on your comment, I assume you mean a GUI program for interactive exploration and manipulation, rather than a library?

This was posted on HN a few months ago and came to mind: https://github.com/facontidavide/PlotJuggler

In a past job, we used the commercial app nCode Glyphworks for graphical / interactive signal processing from field tests with hundreds of sensors.

Here is a very efficient 2D canvas lib that is extremely efficient https://github.com/leeoniya/uPlot i recommend looking through their readme and seeing if it solves your current problems.

BACKEND:

It's about 3000 lines of Crystal code https://crystal-lang.org/ -- it's been an absolute dream to program in. Ruby-like syntax, statically compiled performance. Nice standard library. Would recommend :)

Performance == caching

Local ephemeral filesystem for shortest-term caching.

Redis for shared medium-term caching and locking.

S3-compatible object storage for longest-term caching (for raw data feeds pulled every evening by a cronjob).

FRONTEND:

Bootstrap

uPlot https://github.com/leeoniya/uPlot

Just a sprinkle of inline JS+CSS on the page.

you can use matchMedia to detect devicePixelRatio changes and re-sync:

https://github.com/leeoniya/uPlot/blob/190134aa844cfa2a0c052...

everything stays crisp even as you browser-zoom. e.g. https://leeoniya.github.io/uPlot/demos/area-fill.html

Safari's slow release cadence (typically tied to OS version upgrades) does leave it more broken and for longer than Firefox, Chrome, Opera and other browsers that are updated more frequently and not tied to the OS.

just recently i ran into incompatibilities with Safari < 14 needing the old-spec matchmedia api:

https://github.com/leeoniya/uPlot/issues/538#issuecomment-87...

uPlot will handle this. https://github.com/leeoniya/uPlot

If you are showing 100s of thousands of points, I'd still go with canvas eg uPlot. It's a really, really excellent library.

The existing node red chart tools is not great. I'd like to be able to use uplot instead. The uplot-charts node should work very much like that charts node built into node-red-dashboard.

super cool!

i've done my share of optimizations and benchmarking charting libs [1] but this goes deeper still.

SVG is not a good choice for large raw datasets when you need performance.

[1] https://github.com/leeoniya/uPlot#performance