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RGraph is a JavaScript charts library based on HTML5 SVG and canvas. RGraph is mature (over 15 years old) and has a wealth of features making it an ideal choice to show charts on your website.

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SVG paths for canvas

Written by Richard Heyes, RGraph author, on 3rd September 2015

As stated elsewhere canvas paths are (unnecessarily) verbose. The W3C has attempted to aid the issue by introducing support for svg paths in the new Path2D object.

This new object, however, is not currently widely supported. So RGraph provides a work-around using the RGraph.path function.

This is a description of that function and a version of it that has been extracted from the RGraph code and works standalone.

https://www.rgraph.net/blog/paths.html