如何将颜色和大小的比例组合成一个图例? [英] How to combine scales for colour and size into one legend?

问题描述

我想知道如何在大小和颜色来自相同数据的绘图中为 scale_size() {ggplot2} 中的 size_scale 着色.

I would like to know how to colorize the size_scale in scale_size() {ggplot2} in a plot where the size and color are from the same data.

示例:

 library(ggplot2)
    df<-as.data.frame(cbind(rep(1:10,10),
                            rep(1:10,each=10),
                            rnorm(100)))

    ggplot(df,aes(V1,V2))+
      geom_point(aes(colour=V3,size=V3))+
      scale_colour_gradient(low="grey", high="black")+
      scale_size(range=c(1,10))

如您所见，V3 的颜色和数据点大小是相同的.如何将颜色渐变合并到大小比例(除非在 Illustrator 等程序中手动执行此操作...)?谢谢！

As you can see the V3 is the same for the color and the size of the data points. How can I merge the color gradient to the size scale (except do this manually in program such as Illustrator...)? Thanks!

推荐答案

使用ggplot2的guides()函数.在这种情况下:

Use the guides() function of ggplot2. In this case:

ggplot(df,aes(V1,V2))+
  geom_point(aes(colour=V3,size=V3))+
  scale_colour_gradient(low="grey", high="black")+
  scale_size(range=c(1,10)) +
  guides(color=guide_legend(), size = guide_legend())

ggplot2 会尝试为您整合尺度.在这种情况下不是，因为色阶的默认指南是颜色条，而尺寸的默认指南是普通图例.一旦您将它们都设置为图例，ggplot 2 就会接管并将它们组合起来.

ggplot2 will try to integrate the scales for you. It doesn't in this case because the default guide for a color scale is a colorbar and the default guide for size is a normal legend. Once you set them both to be legends, ggplot 2 takes over and combines them.

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