在 R Plotly 中按组使用 RGB 客户颜色

Question

我有几个系列，我想用 plotly R 制作动画。按照此处的示例 (https://plot.ly/r/cumulative-animations/) 进行操作后，我可以制作动画了。我想出了如何更改组的颜色，但是，我需要组的特定颜色（RGB 自定义颜色）。

我有两个问题：

1. 如何将 RGB 颜色分配给 R Plotly 中的组...我在这里缺少什么？
2. 有更简单的方法吗？我有几个“城市”，而不仅仅是两个，并且希望能够动态分配特定的颜色。我能够将颜色作为数据框中的一列拉入，并希望能够以这种方式分配它们...让它适用于常规颜色，但需要将它用于 RGB...

library(plotly)

# Helper function to create frames
accumulate_by <- function(dat, var) {
  var <- lazyeval::f_eval(var, dat)
  lvls <- plotly:::getLevels(var)
  dats <- lapply(seq_along(lvls), function(x) {
    cbind(dat[var %in% lvls[seq(1, x)], ], frame = lvls[[x]])
  })
  dplyr::bind_rows(dats)
}

# Pull in data and also create color columns
d <- 
  txhousing %>%
  filter(year > 2005, city %in% c("Abilene", "Bay Area")) %>%
  accumulate_by(~date) %>%
  mutate(regular_color = if_else(city == "Abilene", 'red', 'black'),
         RGB_color = if_else(city == "Abilene", 'rgb(229,18,18)', 'rgb(13,9,9)'))

# color vectors
reg_color_vector <- 
  d %>%
  arrange(city) %>%
  select(regular_color) %>%
  distinct() %>%
  pull()
RGB_color_vector <- 
  d %>%
  arrange(city) %>%
  select(RGB_color) %>%
  distinct() %>%
  pull()

p <- d %>%
  plot_ly(
    x = ~date, 
    y = ~median,
    split = ~city,
    frame = ~frame, 
    type = 'scatter',
    mode = 'lines', 
    line = list(simplyfy = F),
    color = ~city,
    # colors = c('red', 'black')
    colors = c('rgb(229, 18, 18)', 'rgb(13, 9, 9)')
    # colors = reg_color_vector
    # colors = RGB_color_vector
  ) %>% 
  layout(
    xaxis = list(
      title = "Date",
      zeroline = F
    ),
    yaxis = list(
      title = "Median",
      zeroline = F
    )
  ) %>% 
  animation_opts(
    frame = 100, 
    transition = 0, 
    redraw = FALSE
  ) %>%
  animation_slider(
    hide = T
    ) %>%
  animation_button(
    x = 1, xanchor = "right", y = 0, yanchor = "bottom"
  )

p

Answer 1

rgb() 是一个函数，它输出你想要的颜色的十六进制值。这就是您需要存储的内容。删除' 应该没问题。并且您需要将maxColorValue = 255 添加到rgb() 函数中。

d <- 
  txhousing %>%
  filter(year > 2005, city %in% c("Abilene", "Bay Area")) %>%
  accumulate_by(~date) %>%
  mutate(regular_color = if_else(city == "Abilene", 'red', 'black'),
         RGB_color = if_else(city == "Abilene", 
                             rgb(229, 18, 18, maxColorValue = 255), 
                             rgb(13, 9, 9, maxColorValue = 255)))

您可以使用plot_ly 而非RGB_color_vector 来定义颜色。

plot_ly(
  x = ~date, 
  y = ~median,
  split = ~city,
  frame = ~frame, 
  type = 'scatter',
  mode = 'lines', 
  line = list(simplyfy = F),
  color = ~city,
  colors = RGB_color_vector
)