r - 向 R 气泡图添加基于颜色的区分

Question

我遇到了气泡图教程 here ，我正在重复使用其代码以进行说明。请在下面找到代码:

crime <-read.csv("http://datasets.flowingdata.com/crimeRatesByState2005.tsv", header=TRUE, sep="\t")

popIndex <- crime$population/max(crime$population)
crime.new <- cbind(crime,popIndex)

ggplot(crime, aes(x=murder, y=burglary, size=population, label=state),guide=FALSE)+
geom_point(colour="white", fill="#E69F00", shape=21)+ scale_size_area(max_size = 22)+
scale_x_continuous(name="Murders per 1,000 population", limits=c(0,12))+
scale_y_continuous(name="Burglaries per 1,000 population", limits=c(0,1250))+
geom_text(size=4)+
theme_bw()

在此图中，气泡大小由人口决定。我的问题是，如果我必须使用气泡颜色在绘图中容纳 popIndex 变量，我该怎么做？

Answer 1

我会这样画。请注意，大小现在没有与之关联的颜色，因为此“域”已被 fill = popIndex 接管。

crime$popIndex <- crime$population/max(crime$population)

ggplot(crime, aes(x=murder, y=burglary, label=state))+
  geom_point(aes(size=population, fill = popIndex), shape=21)+ 
  scale_size_area(max_size = 22)+
  scale_x_continuous(name="Murders per 1,000 population", limits=c(0,12))+
  scale_y_continuous(name="Burglaries per 1,000 population", limits=c(0,1250))+
  geom_text(size=4)+
  theme_bw()

要反转 popIndex 比例添加到堆栈

scale_fill_gradient(trans = "reverse") +