R语言 hjust = 0, vjust = 1属性设置

2019-11-06 06:50:50

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The value of hjust and vjust are only defined between 0 and 1: （hjust 和 vjust的值限定在0-1）

0 means left-justified（0表示左适应） 1 means right-justified（1表示右适应） Source: ggplot2, Hadley Wickham, page 196 （资料来源于ggplot2, Hadley Wickham, page 196）

hjust controls horizontal justification and vjust controls vertical justification. （hjust 控制horizontal横轴， vjust控制vertical纵轴）

An example should make this clear（举个例子来说明下）:

td <- expand.grid( hjust=c(0, 0.5, 1), vjust=c(0, 0.5, 1), angle=c(0, 45, 90), text="text")ggplot(td, aes(x=hjust, y=vjust)) + geom_point() + geom_text(aes(label=text, angle=angle, hjust=hjust, vjust=vjust)) + facet_grid(~angle) + scale_x_continuous(breaks=c(0, 0.5, 1), expand=c(0, 0.2)) + scale_y_continuous(breaks=c(0, 0.5, 1), expand=c(0, 0.2))

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To understand what happens when you change the hjust in axis text, you need to understand that the horizontal alignment for axis text is defined in relation not to the x-axis, but to the entire plot (where this includes the y-axis text). (This is, in my view, unfortunate. It would be much more useful to have the alignment relative to the axis.) （想要理解当你改变hjust时对图像的影响，你需要明白在axis text中，horizontal alignment是针对整个plot而不是x-axis）

DF <- data.frame(x=LETTERS[1:3],y=1:3)p <- ggplot(DF, aes(x,y)) + geom_point() + ylab("Very long label for y") + opts(axis.title.y=theme_text(angle=0))p1 <- p + opts(axis.title.x=theme_text(hjust=0)) + xlab("X-axis at hjust=0")p2 <- p + opts(axis.title.x=theme_text(hjust=0.5)) + xlab("X-axis at hjust=0.5")p3 <- p + opts(axis.title.x=theme_text(hjust=1)) + xlab("X-axis at hjust=1")library(ggExtra)align.plots(p1, p2, p3)

这里写图片描述 To explore what happens with vjust aligment of axis labels: （来看看改变vjust产生的影响）

DF <- data.frame(x=c("a/na","b","cdefghijk","l"),y=1:4)p <- ggplot(DF, aes(x,y)) + geom_point()p1 <- p + opts(axis.text.x=theme_text(vjust=0, colour="red")) + xlab("X-axis labels aligned with vjust=0")p2 <- p + opts(axis.text.x=theme_text(vjust=0.5, colour="red")) + xlab("X-axis labels aligned with vjust=0.5")p3 <- p + opts(axis.text.x=theme_text(vjust=1, colour="red")) + xlab("X-axis labels aligned with vjust=1")library(ggExtra)align.plots(p1, p2, p3)

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