在ggplot2中带有npc坐标的custom_annotation [英] custom_annotation with npc coordinates in ggplot2
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问题描述
我想在每个面板的底部绘制一个框(不同的y范围!)。箱子在x轴上应始终为3到7,从面板底部的边框到y轴高度的5%。
因此,我想指定例如单位中的annotation_custom或geom_rect。
类似于:
I would like to draw a box at the bottom of each panel (different y-ranges!). The box should always be from 3 to 7 on the x-axis and from the border at the bottom of the panel to about 5% of y-axis high. So I would like to specify the coordinates of e.g. annotation_custom or geom_rect in units. something like:
xmin=unit(3, "native"), xmax=unit(7,"native"), ymin=unit(0,"npc"), ymax=unit(0.05,"npc")
I can do it, but the units seem to be ignored, its always native.
library("grid")
library("ggplot2")
df <- data.frame(x=c(1:10,1:10),y=c(1:10,1001:1010),condition=rep(c("A","B"),each=10))
g <- rectGrob(gp=gpar(fill="black"))
p <- ggplot(df, aes(x=x,y=y)) + geom_line() + facet_wrap(~ condition, scales="free_y")
p + geom_rect(xmin=3,xmax=7,ymin=0.56,ymax=1,colour="black", fill="black")
g <- rectGrob(gp=gpar(fill="black"))
p + annotation_custom(g, xmin=3, xmax=7, ymin=0, ymax=1 )
p + annotation_custom(g, xmin=unit(3, "native"), xmax=unit(7,"native"),ymin=unit(0,"npc"),ymax=unit(1,"npc") )
推荐答案
您可以这样做,
You could do,
g <- rectGrob(y=0,height = unit(0.05, "npc"), vjust=0,
gp=gpar(fill="black"))
p + annotation_custom(g, xmin=3, xmax=7, ymin=-Inf, ymax=Inf)
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