r - 将绘制的线段末端从圆形更改为扁平

Question

当我使用 segments()要使用 R 绘制线段，末端总是呈圆形。如何将末端改平？

Answer 1

来自 ?par :

 ‘lend’ The line end style.  This can be specified as an integer or
      string:

      ‘0’ and ‘"round"’ mean rounded line caps [_default_];

      ‘1’ and ‘"butt"’ mean butt line caps;

      ‘2’ and ‘"square"’ mean square line caps.

例如:

plot(0:1,0:1,type="n")
par(lend=0); segments(0,0.2,1,0.2,lwd=8)
par(lend=1); segments(0,0.4,1,0.4,lwd=8)
par(lend=2); segments(0,0.6,1,0.6,lwd=8)

或 segments(0,0.2,1,0.2,lwd=8, lend=1)等。


(您必须非常仔细地查看差异，尤其是“对接”和“方”帽之间的区别)