Variable-Width Bezier Splines in R

This report describes support for a new type of variable-width line in the 'vwline' package for R that is based on Bezier curves. There is also a new function for specifying the width of a variable-width line based on Bezier curves and there is a new linejoin and lineend style, called "extend", that is available when both the line and the width of the line are based on Bezier curves. This report also introduces a small 'gridBezier' package for drawing Bezier curves in R.本报告介绍了R语言vwline包中对基于贝塞尔曲线（Bezier curves）的新型变宽度线条的支持。此外，还新增了一款用于定义基于贝塞尔曲线的变宽度线条宽度的函数；同时新增了一种名为"extend"的线条连接与线条端点样式，仅当线条本身及线条宽度均基于贝塞尔曲线时，方可使用该样式。本报告同时介绍了一款用于在R语言中绘制贝塞尔曲线的轻量型gridBezier包。