R 为条形图设置自定义颜色 [英] R Plotly set custom colors for bar chart

问题描述

我的 Shiny 应用中有一个 plotly 条形图，我想为结果条形图中的每一列设置特定颜色.

I've got a plotly bar chart in my Shiny app, and I'd like to set specific colors each column in the resulting bar chart.

#Here's some reproducible data
df=data.frame(Month=c("Jan","Feb","Mar","Apr","May","Jun"),Criteria1=c(10,15,20,15,7,6),Criteria2=c(3,8,5,7,9,10),Criteria3=c(11,18,14,9,3,1))

#Plot

colNames <- names(df)[-1] #Month is the first column

# Here is where I set the colors for each `Criteria`, assuming that the order of colors follows the same order as the factor levels of the `Criteria`.

p <- plotly::plot_ly(marker=list(colors=c('#CC1480', '#FF9673', '#E1C8B4')))

for(trace in colNames){
  p <- p %>% plotly::add_trace(data = df, x = ~Month, y = as.formula(paste0("~`", trace, "`")), name = trace, type = "bar")
}

p %>% 
  layout(title = "Trend Over Time",showlegend = FALSE,
         xaxis = list(title = ""),
         yaxis = list (title = "Monthly Count of QoL Tweets"))

然而，结果图没有显示我指定的任何颜色.

However the resulting plot does not show any of the colors I specify.

我做错了什么?任何指针将不胜感激.

What am I doing incorrectly? Any pointers would be very appreciated.

推荐答案

您可以将颜色分配给一个向量:

You could assign your colors to a vector:

colors <- c('#CC1480', '#FF9673', '#E1C8B4')

然后在稍微修改的循环中添加跟踪.

and then add the traces in a slightly modified loop.

p <- plotly::add_trace(p, 
                       x = df$Month, 
                       y = df[,trace], 
                       marker = list(color = colors[[match(trace, colNames)]]), 
                       name = trace, 
                       type = "bar")
}

这将为您提供以下图表

完整代码

library("plotly")
df=data.frame(Month=c("Jan", "Feb","Mar", "Apr", "May", "Jun"),
              Criteria1 = c(10, 15,20,15,7,6),
              Criteria2 = c(3, 8, 5, 7, 9, 10),
              Criteria3 = c(11, 18, 14, 9, 3, 1))

colNames <- names(df)[-1] #Month is the first column
colors <- c('#CC1480', '#FF9673', '#E1C8B4')
p <- plotly::plot_ly()

#colNames = c('Criteria1')
for(trace in colNames){
  p <- plotly::add_trace(p, 
                         x = df$Month, 
                         y = df[,trace], 
                         marker = list(color = colors[[match(trace, colNames)]]), 
                         name = trace, 
                         type = "bar")
}

p

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