从ggplot2获取图例名称和颜色?[复制]

#get the colours as mentioned in your question
#and you could get the levels from the plot's data
data.frame(colours = unique(g$data[[1]]["colour"]), 
             label = levels(g$plot$data[, g$plot$labels$colour]))

     colour      label
1   #F8766D     setosa
51  #00BA38 versicolor
101 #619CFF  virginica

更新:

如果有 p <- p + scale_color_discrete(labels=c("sp1","sp2","sp3")) 然后你可以:

g <- ggplot_build(p)
data.frame(colours = unique(g$data[[1]]["colour"]), 
             label = g$plot$scales$scales[[1]]$labels)

     colour label
1   #F8766D   sp1
51  #00BA38   sp2
101 #619CFF   sp3