可能有一种简单的方法可以做到这一点,但我不确定它是什么。我正在尝试使图例中的文本与其旁边的颜色框相匹配。我已经尝试了一段时间,还没有找到一种使用element_text函数向图例添加多种颜色的方法。让每个标签都有相同的颜色没有问题,但是有没有办法让每个图例标签都有不同的颜色呢?

data<-data.frame(count=c(39,36,19,6), category=c("a","b","c","d"))
data$fraction = data$count / sum(data$count)
data = data[order(data$fraction), ]
data$ymax = cumsum(data$fraction)
data$ymin = c(0, head(data$ymax, n=-1))
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#Create Plot
fill <- c("blue3","cyan3","darkgrey","forestgreen")
library(ggplot2)
p1 = ggplot(data, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3.5)) +
geom_rect(colour="White") +
coord_polar(theta="y") +
scale_fill_manual(values=fill)+
theme_bw()+
geom_label(aes(label=paste(data$fraction*100,"%"),x=4,y=
(ymin+ymax)/2),inherit.aes = F)+
theme(panel.grid=element_blank())+
theme(axis.ticks=element_blank()) +
xlim(c(0, 4)) +
theme(axis.text=element_blank()) +
theme(legend.text=element_text(color=fill,size=12))+
theme(legend.key.size=unit(2,'lines'))+
theme(legend.key=element_rect(size=5))+
labs(title="donut plot")
print(p1)发布于 2017-04-28 07:36:20
对这个答案做几处修改,match-legend-text-color-in-geom-text-to-symbol,你就得到了你想要的。但请注意,答案使用了grid的编辑功能。
# Your data and plot
data<-data.frame(count=c(39,36,19,6), category=c("a","b","c","d"))
data$fraction = data$count / sum(data$count)
data = data[order(data$fraction), ]
data$ymax = cumsum(data$fraction)
data$ymin = c(0, head(data$ymax, n=-1))
fill <- c("blue3","cyan3","darkgrey","forestgreen")
library(ggplot2)
p1 = ggplot(data, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3.5)) +
geom_rect(colour="White") +
coord_polar(theta="y") +
scale_fill_manual(values=fill)+
theme_bw()+
geom_label(aes(label=paste(data$fraction*100,"%"),x=4,y=
(ymin+ymax)/2),inherit.aes = F)+
theme(panel.grid=element_blank())+
theme(axis.ticks=element_blank()) +
xlim(c(0, 4)) +
theme(axis.text=element_blank()) +
theme(legend.text=element_text(color=fill,size=12))+
theme(legend.key.size=unit(2,'lines'))+
theme(legend.key=element_rect(size=5))+
labs(title="donut plot")
# Get the ggplot grob
g <- ggplotGrob(p1)
# Check out the grobs
library(grid)
grid.ls(grid.force(g))浏览一下grobs的列表。您想要编辑的grobs位于列表的底部,在grobs的'guide-box‘集合中-名称以"label“开头。有四个grobs:
标签-3-3.4-4-4-4
label-4-3.5-4-5-4
label-5-3.6-4-6-4
标签-6-3.7-4-7-4
# Get names of 'label' grobs.
names.grobs <- grid.ls(grid.force(g))$name
labels <- names.grobs[which(grepl("^label", names.grobs))]
# Edit the 'label' grobs - change their colours
# Use the `editGrob` function
for(i in seq_along(labels)) {
g <- editGrob(grid.force(g), gPath(labels[i]), grep = TRUE,
gp = gpar(col = fill[i]))
}
# Draw it
grid.newpage()
grid.draw(g)

发布于 2020-05-02 09:28:04
通过使用ggtext包,可以在不编辑grobs的情况下实现这一点。将图例文本标签指定为element_markdown,并将它们包含在使用所需颜色的<span>标记中。
data<-data.frame(count=c(39,36,19,6), category=c("a","b","c","d"))
data$fraction = data$count / sum(data$count)
data = data[order(data$fraction), ]
data$ymax = cumsum(data$fraction)
data$ymin = c(0, head(data$ymax, n=-1))
fill <- c("blue3","cyan3","darkgrey","forestgreen")
library(ggplot2)
library(ggtext)
ggplot(data, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3.5)) +
geom_rect(colour="White") +
coord_polar(theta="y") +
scale_fill_manual(labels = paste("<span style='color:",
fill,
"'>",
unique(data$category),
"</span>"),
values = fill)+
theme_bw()+
geom_label(aes(label=paste(data$fraction*100,"%"),x=4,y=
(ymin+ymax)/2),inherit.aes = F)+
theme(panel.grid=element_blank())+
theme(axis.ticks=element_blank()) +
xlim(c(0, 4)) +
theme(axis.text=element_blank()) +
theme(legend.text=element_markdown(size=12))+
theme(legend.key.size=unit(2,'lines'))+
theme(legend.key=element_rect(size=5))+
labs(title="donut plot")

https://stackoverflow.com/questions/43661251
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