[英]Clip lines to plot area and display text outside plot area
我想限制我的情节的可见y范围。 为了保留超出此范围的值,我需要将oob
( 越界 )设置为rescale_none
,这很有效。
不过,我还想在情节之外的边缘添加一些文字。 为了做到这一点,我需要关闭剪辑。 这具有以下效果:超出边界的值被绘制在边距中的绘图区域之外。
无论如何,在边距和剪辑值中绘制文本以绘制区域?
# Data
set.seed(1)
df <- data.frame( x=1:100,y=rnorm(100,mean=1,sd=1) )
# Basic plot
library(ggplot2)
library(scales)
library(grid)
g <- ggplot(df)+
geom_line(aes(x,y))
# Values exceeding scale limits are dropped
g1 <- g + scale_y_continuous( limits = c(0,2) )
# This is what I want
g2 <- g + scale_y_continuous( limits = c(0,2) , oob = rescale_none )
# ...But, I would like to plot some text outside the plotting region
# and need to turn off clipping to get the text to display...
g3 <- g + scale_y_continuous( limits = c(0,2) , oob = rescale_none ) +
# Some text to sit above the plot
geom_text( aes(label = "Nonsense", y = Inf, x = 0), hjust = 0, vjust = -1) +
# Add some space for the text
theme(plot.margin = unit(c(2,1,1,1), "lines"))
# Turning off clipping makes geom_line also go outside plot area...
# See here for clipping... http://stackoverflow.com/a/12417481/1478381
g4 <- ggplot_gtable(ggplot_build(g3))
g4$layout$clip[g4$layout$name == "panel"] <- "off"
grid.draw(g4)
从这里开始 ,这是我的解决方案:
library(gtable)
gg <- ggplotGrob(g2)
gg <- gtable_add_grob(gg, textGrob("Nonsense", x=0, hjust=0), t=1, l=4)
grid.draw(gg)
使用ggplot2::labs()
。 ggplot2的最后一个版本包括此功能,用于在每个图形上打印标题,副标题和字幕。
p = ggplot(mtcars, aes(mpg, wt, colour = cyl)) + geom_point() p + labs(colour = "Cylinders") p + labs(x = "New x label", title='Plot title', caption='Source: IMF.')
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