解决方案
您可以从 grob
ggplot的对象。然后,您可以使用 grid.arrange
函数来定位所有内容。
library(gridExtra)
g_legend< -function(a.gplot){
tmp< - ggplot_gtable(ggplot_build(a.gplot))
leg< - 其中(sapply(tmp $ grobs ,函数(x)x $ name)==guide-box)
传说< - tmp $ grobs [[leg]]
传说
}
图例< - g_legend(plot1)
grid.arrange(legend,plot1 + theme(legend.position ='none'),
ncol = 2,nrow = 1,widths = c (1 / 6,5 / 6))
网上有很多例子使用 g_legend
函数。
HTH
I am using the grid lpackage to place my graphs that I made with ggplot2:
library(ggplot2)
library(grid)
Layout <- grid.layout(nrow = 4, ncol = 4,
widths = unit(1, "null"),
heights = unit(c(0.4, 0.8, 1.2, 1.2), c("null", "null", "null")))
grid.show.layout(Layout)
plot1 = ggplot(diamonds, aes(clarity, fill = color)) +
geom_bar() +
facet_wrap(~cut, nrow = 1)
print(plot1 + theme(legend.position = "none"),
vp = viewport(layout.pos.row = 3, layout.pos.col = 1:4))
The problem is that I want to put the plot on the third row (3,1) - (3,4) and put the legend at the (4,4) position. Unfortunately, I can't really find a way to create just a legend variable.
I searched online and the closest that I got was using the older
+ opts(keep = "legend_box")
but that has been deprecated.
older solution.
解决方案
You can get the legend from the grob
object of the ggplot. Then you could use the grid.arrange
function to position everything.
library(gridExtra)
g_legend<-function(a.gplot){
tmp <- ggplot_gtable(ggplot_build(a.gplot))
leg <- which(sapply(tmp$grobs, function(x) x$name) == "guide-box")
legend <- tmp$grobs[[leg]]
legend
}
legend <- g_legend(plot1)
grid.arrange(legend, plot1+ theme(legend.position = 'none'),
ncol=2, nrow=1, widths=c(1/6,5/6))
There are lots of examples on the web using the g_legend
function.
HTH
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