r - 将绘制的线段末端从圆形更改为扁平

Question

当我使用segments()R 绘制线段时，末端总是呈圆形。我怎样才能把两端改成平的？

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)等等。

（您必须非常仔细地看才能看到区别，尤其是“对接”和“方形”大写之间）