library(grid)
plot(0:10, 0:10, type="n", xlab="X", ylab="Y")
grid.roundrect(gp=gpar(fill="#00000000", col="grey"))

如果您发现边框被切断,您可以随时减小圆角矩形的大小:
plot(0:10, 0:10, xlab="X", ylab="Y")
grid.roundrect(height=0.99, width=0.99, gp=gpar(fill="#00000000", col="grey"))
