如何在使用十六进制字符串的情况下更改plotly for r中饼图的分片颜色？

Question

这是我现在的饼图：

library(plotly)
library(RColorBrewer)


P <- data.frame (labels = c("A", "B", "C", "D", "E"),
             values = c(5, 8, 3, 4, 9))

plot_ly(P, labels = labels, values = values, type = "pie",
    marker = list(colors=c("lightskyblue", "deepblue", "dodgerblue", "midnightblue", "powderblue")),
    textinfo="value",
    textposition="outside") 

我想使用十六进制字符串更改它的颜色，这样我就可以使用RColorBrewer的调色板。非常感谢！

- LauraP

Answer 1

只需将十六进制值放入字符串中，以井号（#）为前缀。十六进制的前两位代表红色，接下来两位代表绿色，然后是两位蓝色（#RRGGBB）。可选地，您可以添加额外的两个数字来表示透明度（#RRGGBBAA）。

例如：

plot_ly(P, labels = labels, values = values, type = "pie",
    marker = list(colors=c("#556677", "#AA3344", "#772200", 
                           "#11AA22", "#AA231B88")), # the last color has alpha value set.
    textinfo="value",
    textposition="outside") 

- dww

Answer 2

探索 RColorBrewer 包

   library(RColorBrewer)

查看RColorBrewer包内的函数列表：

   ls("package:RColorBrewer")
   #  [1] "brewer.pal"         "brewer.pal.info"    "display.brewer.all"
   #  [4] "display.brewer.pal"

显示所有配色方案

   display.brewer.all()

获得蓝色十六进制字符串。

   brewer.pal(9,"Blues")
   # [1] "#F7FBFF" "#DEEBF7" "#C6DBEF" "#9ECAE1" "#6BAED6" "#4292C6" "#2171B5"
   # [8] "#08519C" "#08306B"

   brewer.pal(10,"Blues")
   # [1] "#F7FBFF" "#DEEBF7" "#C6DBEF" "#9ECAE1" "#6BAED6" "#4292C6" "#2171B5"
   # [8] "#08519C" "#08306B"
   # Warning message:
   # In brewer.pal(10, "Blues") :
   # n too large, allowed maximum for palette Blues is 9
   # Returning the palette you asked for with that many colors

查看蓝色调色板

  display.brewer.pal(9,"Blues")

颜色数量是有限制的，但如果您想扩展连续或分散的颜色组，可以使用colorRampPalatte命令，例如：

  colorRampPalette(brewer.pal(9,”Blues”))(100)

以下是 divergent、qualitative 和 sequential 配色方案的示例。可以使用上述命令 display.brewer.all() 查看这些配色方案的名称，如 Spectral、Set2 和 Reds。您也可以从列表中选择其他配色方案。

 display.brewer.pal(4,"Spectral")
 brewer.pal(4,"Spectral")
 # [1] "#D7191C" "#FDAE61" "#ABDDA4" "#2B83BA"

 display.brewer.pal(4,"Set2")
 brewer.pal(4,"Set2")
 # [1] "#66C2A5" "#FC8D62" "#8DA0CB" "#E78AC3"

 display.brewer.pal(4,"Reds")
 brewer.pal(4,"Reds")
 # [1] "#FEE5D9" "#FCAE91" "#FB6A4A" "#CB181D"

- Sowmya S. Manian