The charts, especially when exportedToImage are oversized/scaled - discovered on a MacBook in Chrome and Safari - while testing for an issue with Primefaces (Pf uses JqPlot for charts)
See on the jqplot test-page, but it is also reproducible on Linux/Ubuntu with a Chromium-based browser when opening developer tools and selecting any mobile-device (in this case I set it to "responsive")
!! - reload the page after opening dev-tools !! - at any resolution the image keeps getting oversized. To disable the effect, just close dev-tools and reload. Now the image looks correct again.
There was an issue on GitHub, but it was closed. Also the showcase of PrimeFaces using this library works.
How can that be? I've checked this with all my available devices to rule that out - but it's somehow strange - can someone also reproduce this?
What does developer tools and Chromium on Mac do to get these results? - ignoring media-queries? I've also experimented with that, no success.
If your read that jqPlot ticket you posted here it has a solution in it: https://github.com/jqPlot/jqPlot/issues/119
PrimeFaces 8.0 Showcase has the following manually patched fix applied from that ticket: https://github.com/primefaces/primefaces/issues/4655
That is why the PrimeFaces showcase does not exhibit the issue if you read through that ticket it is a two line fix applied to the JQPlot code.