R Plotly：如何订购饼图？

Question

我正在plotlyR中使用该软件包来构建R Shiny仪表板。我想按自定义顺序（非字母顺序，非降序/升序）订购饼图。由于某些原因，我找不到实现该目标的方法。

帮助将不胜感激！

# Get Manufacturer
mtcars$manuf <- sapply(strsplit(rownames(mtcars), " "), "[[", 1)

df <- mtcars %>%
  group_by(manuf) %>%
  summarize(count = n())

# Create custom order
customOrder <- c(df$manuf[12:22],df$manuf[1:11])

# Order data frame
df <- df %>% slice(match(customOrder, manuf))

# Create factor
df$manuf <- factor(df$manuf, levels = df[["manuf"]])

# Plot
df %>% plot_ly(labels = ~manuf, values = ~count) %>%
  add_pie(hole = 0.6) %>%
  layout(title = "Donut charts using Plotly",  showlegend = F,
         xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
         yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))

Answer 1

好的，答案显然是双重的。首先，中有一个参数plot_ly，要求按值对数据进行排序（默认为TRUE）或使用自定义顺序。将此更改为FALSE。

然后，其次，顺序（顺时针）不同于数据帧中的顺序。饼图从右上角开始，然后逆时针继续。

因此，以下解决了该问题：

# Get Manufacturer
mtcars$manuf <- sapply(strsplit(rownames(mtcars), " "), "[[", 1)

df <- mtcars %>%
  group_by(manuf) %>%
  summarize(count = n())

# Create custom order
customOrder <- c(df$manuf[12:22],df$manuf[1:11])

# Adjust customOrder to deal with pie
customOrder <- c(customOrder[1],rev(customOrder[2:length(customOrder)]))

# Order data frame
df <- df %>% slice(match(customOrder, manuf))

# Create factor
df$manuf <- factor(df$manuf, levels = df[["manuf"]])

# Plot
df %>% plot_ly(labels = ~manuf, values = ~count, sort = FALSE) %>%
  add_pie(hole = 0.6) %>%
  layout(title = "Donut charts using Plotly",  showlegend = F,
         xaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE),
         yaxis = list(showgrid = FALSE, zeroline = FALSE, showticklabels = FALSE))