Murrell, Paul Variable-Width Line Ends and Line Joins This document describes algorithms for generating line-end and<br> line-join styles for lines that have a variable width.<br> The algorithms are implemented in the ‘vwline’ package for R. graphics;X-spline;line styles;Computer Graphics 2017-06-07
    https://auckland.figshare.com/articles/dataset/Variable-Width_Line_Ends_and_Line_Joins/5084701
10.17608/k6.auckland.5084701.v1