R语言_ggplot2_Lv1_Polishing

R语言_学习笔记

玩转内置的元素函数

• element_text()

(1)、生肉

> hgramt <- ggplot(movies,aes(rating)) + geom_histogram(binwidth=1,fill="lightblue") + labs(title="This is a histogram")
> hgramt

(2)、开始微调

> hgramt + theme(plot.title = element_text(size = 30))

> hgramt + theme(plot.title = element_text(size = 30, color="orange"))

> hgramt + theme(plot.title = element_text(size = 30, hjust=1))

> hgramt + theme(plot.title = element_text(size = 30, face="bold.italic"))

> hgramt + theme(plot.title = element_text(size = 30, angle=180))

• element_line()

> hgram <- ggplot(movies,aes(rating)) + geom_histogram(binwidth=1,fill="lightblue")
> hgram + theme(panel.grid.major = element_line(linetype="dotted",size=2,color="orange"))

> hgram + theme(axis.line = element_line(color="red",size=1.2,linetype="dashed"))

• element_rect()

> hgram + theme(plot.background = element_rect(fill = "lightgoldenrod1",colour=NA))

> hgram + theme(panel.background = element_rect(fill="tan1",color=NA, linetype="dotted"))

• element_blank() 逐个逐个地删掉那些不感兴趣的绘图元素

> hgramt + theme(panel.grid.minor = element_blank())

> last_plot() + theme(panel.grid.major = element_blank())

> last_plot()  + theme(panel.background = element_blank())

> last_plot()  + theme(axis.title.x = element_blank(),axis.title.y = element_blank())

> last_plot()  + theme(axis.line=element_line(color="orange"))