我已经使用了指示here的方法来对齐共享相同横坐标的图。
但是,当我的一些图形有图例而另一些没有图例时,我不能让它工作。
下面是一个示例:
library(ggplot2)
library(reshape2)
library(gridExtra)
x = seq(0, 10, length.out = 200)
y1 = sin(x)
y2 = cos(x)
y3 = sin(x) * cos(x)
df1 <- data.frame(x, y1, y2)
df1 <- melt(df1, id.vars = "x")
g1 <- ggplot(df1, aes(x, value, color = variable)) + geom_line()
print(g1)
df2 <- data.frame(x, y3)
g2 <- ggplot(df2, aes(x, y3)) + geom_line()
print(g2)
gA <- ggplotGrob(g1)
gB <- ggplotGrob(g2)
maxWidth <- grid::unit.pmax(gA$widths[2:3], gB$widths[2:3])
gA$widths[2:3] <- maxWidth
gB$widths[2:3] <- maxWidth
g <- arrangeGrob(gA, gB, ncol = 1)
grid::grid.newpage()
grid::grid.draw(g)
使用这段代码,我得到了以下结果:
我想要的是x轴对齐,缺失的图例由空格填充。这个是可能的吗?
编辑:
下面是Sandy Muspratt提出的最优雅的解决方案。
我实现了它,它在两个图形上工作得很好。
然后我试了三个,有不同的图例大小,它不再起作用了:
library(ggplot2)
library(reshape2)
library(gridExtra)
x = seq(0, 10, length.out = 200)
y1 = sin(x)
y2 = cos(x)
y3 = sin(x) * cos(x)
y4 = sin(2*x) * cos(2*x)
df1 <- data.frame(x, y1, y2)
df1 <- melt(df1, id.vars = "x")
g1 <- ggplot(df1, aes(x, value, color = variable)) + geom_line()
g1 <- g1 + theme_bw()
g1 <- g1 + theme(legend.key = element_blank())
g1 <- g1 + ggtitle("Graph 1", subtitle = "With legend")
df2 <- data.frame(x, y3)
g2 <- ggplot(df2, aes(x, y3)) + geom_line()
g2 <- g2 + theme_bw()
g2 <- g2 + theme(legend.key = element_blank())
g2 <- g2 + ggtitle("Graph 2", subtitle = "Without legend")
df3 <- data.frame(x, y3, y4)
df3 <- melt(df3, id.vars = "x")
g3 <- ggplot(df3, aes(x, value, color = variable)) + geom_line()
g3 <- g3 + theme_bw()
g3 <- g3 + theme(legend.key = element_blank())
g3 <- g3 + scale_color_discrete("This is indeed a very long title")
g3 <- g3 + ggtitle("Graph 3", subtitle = "With legend")
gA <- ggplotGrob(g1)
gB <- ggplotGrob(g2)
gC <- ggplotGrob(g3)
gB = gtable::gtable_add_cols(gB, sum(gC$widths[7:8]), 6)
maxWidth <- grid::unit.pmax(gA$widths[2:5], gB$widths[2:5], gC$widths[2:5])
gA$widths[2:5] <- maxWidth
gB$widths[2:5] <- maxWidth
gC$widths[2:5] <- maxWidth
g <- arrangeGrob(gA, gB, gC, ncol = 1)
grid::grid.newpage()
grid::grid.draw(g)
这将导致下图:
我在这里和其他关于这个主题的问题中找到的答案的主要问题是,人们在没有真正解释他们为什么要这样做的情况下,就“玩”了很多向量myGrob$widths
。我见过有人修改myGrob$widths[2:5]
,其他人修改myGrob$widths[2:3]
,但我找不到任何文档来解释这些列是什么。
我的目标是创建一个泛型函数,例如:
AlignPlots <- function(...) {
# Retrieve the list of plots to align
plots.list <- list(...)
# Initialize the lists
grobs.list <- list()
widths.list <- list()
# Collect the widths for each grob of each plot
max.nb.grobs <- 0
longest.grob <- NULL
for (i in 1:length(plots.list)){
if (i != length(plots.list)) {
plots.list[[i]] <- plots.list[[i]] + theme(axis.title.x = element_blank())
}
grobs.list[[i]] <- ggplotGrob(plots.list[[i]])
current.grob.length <- length(grobs.list[[i]])
if (current.grob.length > max.nb.grobs) {
max.nb.grobs <- current.grob.length
longest.grob <- grobs.list[[i]]
}
widths.list[[i]] <- grobs.list[[i]]$widths[2:5]
}
# Get the max width
maxWidth <- do.call(grid::unit.pmax, widths.list)
# Assign the max width to each grob
for (i in 1:length(grobs.list)){
if(length(grobs.list[[i]]) < max.nb.grobs) {
grobs.list[[i]] <- gtable::gtable_add_cols(grobs.list[[i]],
sum(longest.grob$widths[7:8]),
6)
}
grobs.list[[i]]$widths[2:5] <- as.list(maxWidth)
}
# Generate the plot
g <- do.call(arrangeGrob, c(grobs.list, ncol = 1))
return(g)
}
https://stackoverflow.com/questions/41569817
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