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r - 如何将 grobs 存储在列表中并将它们传递给 grobTree()?

转载 作者:行者123 更新时间:2023-12-04 18:01:57 25 4
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所以我试图制作一个 grob 列表,然后将它们传递给 grobTree() ,但我的列表项不会被 do.call() 读入.

这是我的代码:

library(purrr)
library(grid)
library(gridExtra)
library(ggplot2)
qplot(displ, year, data = mpg)

title_segments <- c('Help ', 'me ', 'please', '!')
colors <- c('red', 'orange', 'green', 'blue')
nudge_x = 0

grobs <- NULL
grobs[1] <- list(gp = gpar(fontsize = 14, fontface = 'bold'))
grobs[2] <- list(textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])))

if(length(title_segments) > 1){
x <- unit(2.24 - nudge_x, "lines")
more_grobs <- pmap(list(title_segments[-1], colors[-1],
seq_along(title_segments)[-1]), function(segment, color, i){
grob <- textGrob(label = segment, name = paste0('title', i, sep = ''),
x = x + grobWidth(paste0('title', i - 1, sep = '')),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = color))
})
}
grobs <- c(grobs, more_grobs)

grobs <- do.call(what = grobTree, args = grobs) ### ERROR HERE

# Turn off clipping and draw plot
gb <- ggplot_build(last_plot())
gt <- ggplot_gtable(gb)
gt$layout$clip[gt$layout$name=="panel"] <- "off"
gg <- arrangeGrob(gt, top = grobs, padding = unit(2.6, "line"))
grid.newpage()
grid.draw(gg)

当我到达 do.call() 时发生错误声明,因为我的列表元素不会被读取为 grobs。

当我尝试这段代码时,它的计算结果为真。
var <- NULL
is.grob(var <- textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])))

当我尝试这一点时,它评估为 false
var2 <-NULL
var2[1] <- textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])))
is.grob(var2[1])

编辑::这就是我试图用 pmap 函数实现的目标。
grobs <- grobTree(
gp = gpar(fontsize = 14, fontface = 'bold'),

textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])),

if(length(title_segments) > 1){
textGrob(label = title_segments[2], name = "title2",
x = grobWidth("title1") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[2]))
},

if(length(title_segments) > 2){
textGrob(label = title_segments[3], name = "title3",
x = grobWidth("title1") + grobWidth("title2") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[3]))
},
if(length(title_segments) > 3){
textGrob(label = title_segments[4], name = "title4",
x = grobWidth("title1") + grobWidth("title2") + grobWidth("title3") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[4]))
},
if(length(title_segments) > 4){
textGrob(label = title_segments[5], name = "title5",
x = grobWidth("title1") + grobWidth("title2") + grobWidth("title3") + grobWidth("title4") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[5]))
}
)

最佳答案

让我们尝试回答所写的问题。我读到的问题如下:

此代码有效:

grobs <- grobTree(
gp = gpar(fontsize = 14, fontface = 'bold'),

textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])),

if(length(title_segments) > 1){
textGrob(label = title_segments[2], name = "title2",
x = grobWidth("title1") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[2]))
},

if(length(title_segments) > 2){
textGrob(label = title_segments[3], name = "title3",
x = grobWidth("title1") + grobWidth("title2") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[3]))
},
if(length(title_segments) > 3){
textGrob(label = title_segments[4], name = "title4",
x = grobWidth("title1") + grobWidth("title2") + grobWidth("title3") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[4]))
},
if(length(title_segments) > 4){
textGrob(label = title_segments[5], name = "title5",
x = grobWidth("title1") + grobWidth("title2") + grobWidth("title3") + grobWidth("title4") + unit(2.24 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[5]))
}
)

但是,此代码旨在作为先前代码的计算重新创建,并没有:
grobs <- NULL
grobs[1] <- list(gp = gpar(fontsize = 14, fontface = 'bold'))
grobs[2] <- list(textGrob(label = title_segments[1], name = "title1",
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = colors[1])))

if(length(title_segments) > 1){
x <- unit(2.24 - nudge_x, "lines")
more_grobs <- pmap(list(title_segments[-1], colors[-1],
seq_along(title_segments)[-1]), function(segment, color, i){
grob <- textGrob(label = segment, name = paste0('title', i, sep = ''),
x = x + grobWidth(paste0('title', i - 1, sep = '')),
y = unit(-.5, "lines"),
hjust = 0, vjust = 0, gp = gpar(col = color))
})
}
grobs <- c(grobs, more_grobs)

grobs <- do.call(what = grobTree, args = grobs) ### ERROR HERE

这是怎么回事?答案是问题出在前两行:
grobs <- NULL
grobs[1] <- list(gp = gpar(fontsize = 14, fontface = 'bold'))

任务 grobs[1] <-删除 gp = ... 的命名用于列表元素,因此函数 grobTree()不明白第一个参数不是grob。修复很简单。将这两行替换为:
grobs <- list(gp = gpar(fontsize = 14, fontface = 'bold'))

现在一切正常。 do.call()行不再导致错误。但是字间距还是不对,因为 pmap() call 不会创建从第一个到第 n 个所有 grob 宽度的总和。相反,它只使用前一个 grob 的 grob 宽度。这个问题最好用递归函数解决,我认为:
make_grobs <- function(words, colors, x, y, hjust = 0, vjust = 0, i = 0) {
n <- length(words)
colors <- rep_len(colors, n)
name <- paste0('title', i)
grob <- textGrob(label = words[1], name = name,
x = x, y = y, hjust = hjust, vjust = vjust,
gp = gpar(col = colors[1]))
if (n == 1) {
list(grob)
}
else {
c(list(grob),
make_grobs(words[-1], colors[-1],
x + grobWidth(grob), y, hjust, vjust, i + 1))
}
}

定义此函数后,整个可重现示例变为:
library(purrr)
library(grid)
library(gridExtra)
library(ggplot2)

title_segments <- c('Help ', 'me ', 'please', '!')
colors <- c('red', 'orange', 'green', 'blue')
nudge_x = 0

grobs <- do.call(what = grobTree,
args = c(make_grobs(title_segments, colors,
x = unit(2.33 - nudge_x, "lines"),
y = unit(-.5, "lines")),
list(gp = gpar(fontsize = 14, fontface = 'bold'))))

qplot(displ, year, data = mpg)
gb <- ggplot_build(last_plot())
gt <- ggplot_gtable(gb)
gt$layout$clip[gt$layout$name=="panel"] <- "off"
gg <- arrangeGrob(gt, top = grobs, padding = unit(2.6, "line"))
grid.newpage()
grid.draw(gg)

enter image description here

关于r - 如何将 grobs 存储在列表中并将它们传递给 grobTree()?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47862191/

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