如何在grid.newpage中使用R基图？

Question

有没有可能在grid package的grid.newpage中“强制”R基图？例如，这可以很好地工作：

library(grid)
grid.newpage()
vp1 <- viewport(x=0,y=0.5,width=0.5, height=0.5, just = c("left", "bottom"))
vp2 <- viewport(x=0.5,y=0,width=0.5, height=0.5, just = c("left", "bottom"))
pushViewport(vp1)
grid.rect()
grid.text("vp1", 0.5, 0.5)
upViewport()
pushViewport(vp2)
grid.rect()
grid.text("vp2", 0.5, 0.5)

​

。

但是如果我尝试这样的东西：

grid.newpage()
vp1 <- viewport(x=0,y=0.5,width=0.5, height=0.5, just = c("left", "bottom"))
vp2 <- viewport(x=0.5,y=0,width=0.5, height=0.5, just = c("left", "bottom"))
pushViewport(vp1)
grid.rect()
print(plot(1,2))
grid.text("vp1", 0.5, 0.5)
upViewport()
pushViewport(vp2)
grid.rect()
print(plot(1,2))

R基础图刚刚覆盖了grid.newpage。使用par(new=T)也无济于事。

Answer 1

因为没有人回答这个问题，所以我自己来做。正如Andrie所说，这个问题的答案是here。您需要gridBase包中的gridFIG()函数在plot.new()中绘制R底图，而不是在grid.newpage()中绘制

library(grid)
library(gridBase)
plot.new()
vp1 <- viewport(x=0,y=0.5,width=0.5, height=0.5, just = c("left", "bottom"))
vp2 <- viewport(x=0.5,y=0,width=0.5, height=0.5, just = c("left", "bottom"))
pushViewport(vp1)
grid.rect()
grid.text("vp1", 0.5, 0.5)
par(new=TRUE, fig=gridFIG())
plot(1,2)
upViewport()
pushViewport(vp2)
grid.rect()
grid.text("vp2", 0.5, 0.5)
par(new=TRUE, fig=gridFIG())
plot(1,2)

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