如何从ggplot2图例中删除审美 [英] How to remove an aesthetic from a ggplot2 legend

问题描述

我正在寻找一种方法来隐藏下面代码创建的情节中的一个传奇故事。要按日期缩放点颜色，我不得不将日期转换为数字，而且我宁愿不在日历上显示日期图例。另一方面，形状图例是显示的重要信息。我知道 legend.position =none会完全删除这个图例，但这就给我带来了如何沟通形状背后的意义的问题。

I am looking for a way to hide one of the aestetic legends from the plot created with the code below. To scale the point color by date, I had to convert the dates into numbers, and I'd rather not show the date legend on the plot. On the other hand, the shape legend is important information to display. I understand that legend.position="none" will completely remove the legend, but then that leaves me with the problem of how to communicate the meaning behind the shapes.

library(ggplot2)
w<-read.table("data.txt", header=TRUE)
pt.data <- w[w$dt==min(w$dt),]
p <- ggplot(data=w, aes(OAD,RtgValInt,color=dt,shape=Port)) +
     geom_jitter(size=3, alpha=0.75) +
     scale_colour_gradient(limits=c(min(w$dt), 
             max(w$dt)),
         low="#9999FF", high="#000066") +
     geom_point(data=pt.data, 
         color="red", size=3, aes(shape=Port))
print(p)

data.txt 文件包含下面的行。

Date          Port    OAD         RtgValInt   dt
12/31/2010  Grp1    1.463771    1.833333    14974
12/31/2010  Grp2    1.193307    2.071429    14974
11/30/2010  Grp1    1.454115    1.833333    14943
11/30/2010  Grp2    1.127755    2.071429    14943
10/29/2010  Grp1    1.434965    2.000000    14911
10/29/2010  Grp2    1.055758    2.071429    14911
09/30/2010  Grp1    1.441773    2.000000    14882
09/30/2010  Grp2    1.077799    2.071429    14882

推荐答案

层级。如果将色彩审美从最初的调用移动到ggplot到抖动层，那么似乎会产生您所追求的效果。我有点困惑，至于为什么你会想根据日期着色，而没有提供关于颜色的含义的关键......但这是一个更哲学的问题让你思考。

You can suppress the legends at the layer level. If you move the colour aesthetic from the initial call to ggplot to the jitter layer, that seems to give the effect you are after. I'm a bit confused though as to why you would want to colour based on date and not provide the key as to what the colors mean...but that's a more philosophical question for you to ponder.

ggplot(data=w, aes(OAD,RtgValInt,shape=Port)) +
  geom_jitter(size=3, alpha=0.75, color=dt, legend = FALSE) +
  scale_colour_gradient(limits=c(min(w$dt), max(w$dt)),low="#9999FF", high="#000066") +
  geom_point(data=pt.data, color="red", size=3, aes(shape=Port))

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