geom_tile 和 facet_grid/facet_wrap 用于相同高度的瓷砖 [英] geom_tile and facet_grid/facet_wrap for same height of tiles
问题描述
使用 ggplot,我想用面板表示一个图形图块,但每个面板的图块高度相同.我有这张图:
Using ggplot, I would like represent a graph tile with panel, but with same height tile for each panel. I have this graph :
dataSta <- list(sites=rep(paste("S", 1:31),each=12), month=rep(1:12,31), value=round(runif(31*12, min=0, max=3000)), panel=c(rep("Group 1",16*12),rep("Group 2", 12*12), rep("Group 3", 3*12)))
library(ggplot2)
library(grid)
base_size <- 9
windows()
ggplot(data.frame(dataSta), aes(factor(month), sites)) +
geom_tile(aes(fill = value), colour = "black")+
facet_wrap(~panel, scale="free_y", nrow=3)+
theme_grey(base_size = base_size) +
labs(x = "",y = "") +
scale_x_discrete(expand = c(0, 0)) +
scale_y_discrete(expand = c(0, 0)) +
theme(legend.title = element_blank(),
axis.ticks = element_blank(),
axis.text.x = element_text(size = base_size *0.8, hjust = 0),
panel.margin = unit(0,"lines"),
strip.text = element_text(colour="red3", size=10, face=2))
但是面板之间的瓷砖高度不同.我尝试使用 facet_grid :
But height of tiles is different between panel. I try to use facet_grid :
windows()
ggplot(data.frame(dataSta), aes(factor(month), sites)) +
geom_tile(aes(fill = value), colour = "black")+
facet_grid(panel~., scales="free_y", space="free")+
theme_grey(base_size = base_size) +
labs(x = "",y = "") +
scale_x_discrete(expand = c(0, 0)) +
scale_y_discrete(expand = c(0, 0)) +
theme(legend.title = element_blank(),
axis.ticks = element_blank(),
axis.text.x = element_text(size = base_size *0.8, hjust = 0),
panel.margin = unit(0,"lines"),
strip.text = element_text(colour="red3", size=10, face=2))
瓷砖高度问题已解决,但面板(第 1 组...第 3 组)的标签不在面板顶部.是否可以使用 facet_grid 更改面板标签的位置?或结合 facet_grid 和 facet_wrap ?谢谢你的帮助,对不起我的英语!
The problem with height of tiles is resolved, but labels of panel (Group 1 ... Group 3) are not on top of panel. Is it possible to change position of panel labels with facet_grid ? or combine facet_grid and facet_wrap ? Thanks for your help, and sorry for my English !
推荐答案
您可以在绘图前查看 ggplot 包含的内容,并相应地重新缩放面板.
You can look at what ggplot contains before plotting, and rescale the panels accordingly.
g <- ggplot_build(p)
## find out how many y-breaks are in each panel
## to infer the number of tiles
vtiles <- sapply(lapply(g$panel$ranges, "[[", "y.major"), length)
## convert the plot to a gtable object
gt <- ggplot_gtable(g)
## find out which items in the layout correspond to the panels
## we refer to the "t" (top) index of the layout
panels <- gt$layout$t[grepl("panel", gt$layout$name)]
## replace the default panel heights (1null) with relative sizes
## null units scale relative to each other, so we scale with the number of tiles
gt$heights[panels] <-lapply(vtiles, unit, "null")
## draw on a clean slate
library(grid)
grid.newpage()
grid.draw(gt)
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