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Scrolling line chart

Posted: Fri Jan 16, 2026 11:12 pm
by RGV250
Hi,
I have been looking at the enviroment monitor demo which is close to what I am looking for. The bit I am not happy with is the line chart as when it is full it carries on showing new data but the x axis compresses so over time it will get unreadable.
I would like to have a scrolling chart of the last x samples, I changed the x axis autoscale to "no" but that just meant that as soon as the chart was full it stopped showing live data.
I have a thought that to do what i require I need to write the data to a FIFO buffer and then write the contents to the chart.
This seems like a lot of work and possibly will make the display very slow so I wondered if I am on the right lines or if anyone has any better solution.

Regards,
Bob

Re: Scrolling line chart

Posted: Sat Jan 17, 2026 10:06 am
by BenR
Hi Bob,

Try the historic chart and hopefully that will do what you need.

Re: Scrolling line chart

Posted: Sat Jan 17, 2026 12:49 pm
by chipfryer27
Hi Ben

Admittedly I'm thicker than a porridge milk shake but I can't see any historic chart option in Web Developer.

Regards

Re: Scrolling line chart

Posted: Sat Jan 17, 2026 1:37 pm
by medelec35
Hi Iain.
Historic chart is within PC developer, which the environmental monitor demo uses.

Re: Scrolling line chart

Posted: Sat Jan 17, 2026 3:00 pm
by chipfryer27
Hi Martin

Thanks. Glad to hear I'm not such an idiot after all :) I really should get back into Web / PC developer as I've not touched it in a long while. It is such a useful feature.

Regards

Re: Scrolling line chart

Posted: Sat Jan 17, 2026 3:42 pm
by RGV250
Hi Martin,
Unfortunately I need something for the web developer. I am assuming there are technical reasons why this and xy chart and circular buffers are not in web developer.

Regards,
Bob