R语言ggplot2 title设置教程(main,axis和legend titles)

1. ggplot2中添加title函数

ggtitle(label) # for the main title,主题目
xlab(label) # for the x axis label, xlab
ylab(label) # for the y axis label, ylab
labs(...) # for the main title, axis labels and legend titles,可以同时设定多个lab和tittle

2. 实际应用

(1)添加title、xlab和ylab

ToothGrowth$dose <- as.factor(ToothGrowth$dose)
library(ggplot2)
p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot()
## 方法1:
p + ggtitle("Plot of length \n by dose") +
xlab("Dose (mg)") + ylab("Teeth length")

## 方法2:
p +labs(title="Plot of length \n by dose",
      x ="Dose (mg)", y = "Teeth length")

(2)修改legend名字

# Default plot
p <- ggplot(ToothGrowth, aes(x=dose, y=len, fill=dose))+
geom_boxplot()
p
# Modify legend titles
p + labs(fill = "Dose (mg)")

(3)修改title的字体,位置,颜色等

参数,其中hjust和vjust可以调节位置, anglexlab和ylab调节角度,size可以调节label大小:

family : font family
face : font face. Possible values are “plain”, “italic”, “bold” and “bold.italic”
colour : text color
size : text size in pts
hjust : horizontal justification (in [0, 1])
vjust : vertical justification (in [0, 1])
lineheight : line height. In multi-line text, the lineheight argument is used to change the spacing between lines.
color : an alias for colour
angle: angle

使用:

# Default plot
p <- ggplot(ToothGrowth, aes(x=dose, y=len)) + geom_boxplot() +
ggtitle("Plot of length \n by dose") +
xlab("Dose (mg)") + ylab("Teeth length")
p
# Change the color, the size and the face of
# the main title, x and y axis labels
p + theme(
plot.title = element_text(color="red", size=14, face="bold.italic"),
axis.title.x = element_text(color="blue", size=14, face="bold"),
axis.title.y = element_text(color="#993333", size=14, face="bold")
)

此外,修改坐标轴的angle也是相似的构造:

require(ggplot2)
ggplot(data=mtcars, aes(x=mpg, y=wt)) + geom_point()  + theme(axis.text.x = element_text(angle=90))
ggplot(data=mtcars, aes(x=mpg, y=wt)) + geom_point()  + theme(axis.text.y = element_text(angle=90))

(4)删除xlab和ylab

# Hide the main title and axis titles
p + theme(
plot.title = element_blank(),
axis.title.x = element_blank(),
axis.title.y = element_blank())

总之,一次性设定ggplot相关title的话, labs(title=" ", x=" ",y=" ")即可,修改需要使用后面的theme(axis.text.x = element_text(angle=90)),类似这种设定。

翻译来源:

http://www.sthda.com/english/wiki/ggplot2-title-main-axis-and-legend-titles

总结

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