更改复合图例标题

Question

如果我有以下数据并使用ggplot2我得到它:

a  <-c(0.3,0.3,0.3,0.3,0.3)
b  <-c(1:5,0.9,0.9,0.9,0.9,0.9)
c  <-c(1:5,0.5,0.5,0.5,0.5,0.5)
z  <-rep(1:5,5)
df <- data.frame(y=c(a,b,c),x=c(z),line=c(rep("1",5),
rep("2",5),rep("3",5),rep("2",5),rep("3",5)))

library(ggplot2)

a <- ggplot(df,aes(x=x,y=y,fill=line,shape=line,group=line)) +       
          geom_line(aes(linetype=line),size=1) +            
     scale_linetype_manual(values=c("dashed","solid", "dotdash")) +
          geom_point(size=3) + scale_shape_manual(values=c(25,23,21,25,23)) +    
     scale_fill_manual(values=c("red", "blue", "yellow","red", "blue"))

如果我想指定图例的标题,我可以做很多事情

a + labs(shape = "MY TITLE HERE")   # or

a <- ggplot(df,aes(x=x,y=y,fill=line,shape=line,group=line)) +       
          geom_line(aes(linetype=line),size=1) +            
     scale_linetype_manual(values=c("dashed","solid", "dotdash")) +
          geom_point(size=3) + scale_shape_manual(values=c(25,23,21,25,23),name="MY 
          TITLE HERE") +    
     scale_fill_manual(values=c("red", "blue", "yellow","red", "blue"))

但是,所有这些选项都会将复合图例分解为单独的映射参数.

如何维护与复合的传说linetype,shape以及fill和更改图例标题？

Answer 1

在ggplot2具有相同标签的所有比例中,将组合在一起,因此您需要这样做:

1. (可选)使用您的标签创建变量,例如 scale_label
2. 将相同的标签传递给每个比例作为第一个参数.

例如:

scale_label <- "My custom title"

a <- ggplot(df,aes(x=x,y=y,fill=line,shape=line,group=line)) +       
    geom_line(aes(linetype=line),size=1) +            
    scale_linetype_manual(scale_label, values=c("dashed","solid", "dotdash")) +
    geom_point(size=3) + 
    scale_shape_manual(scale_label, values=c(25,23,21,25,23)) +    
    scale_fill_manual(scale_label, values=c("red", "blue", "yellow","red", "blue")) 
    #scale_shape("Title")
print(a)