Customizing Bar Charts with Plotly R: Removing Red Line and Adding Average Values

Introduction to Customizing Bar Charts in Plotly R

In this article, we will explore how to customize a bar chart in Plotly R. We will cover removing the red line from the chart and adding average value of ‘share’ as a horizontal line on the Y axis.

Installing Required Libraries

Before we begin, make sure you have installed the required libraries. You can install them using the following command:

install.packages("plotly", dependencies = TRUE)
library(plotly)

Creating a Sample Dataset

We will create a sample dataset to demonstrate how to customize the bar chart.

df <- data.frame(
  model = c("A", "B", "C","D","E","F"),
  share = c(12,20,15,9,60,20),
  sale = c(16,25,18,14,67,28),
  cost = c(14,19,28,24,57,28)
)

df$model <- factor(df$model, levels = arrange(df, desc(df$cost))$model)

Step 1: Removing the Red Line from the Chart

To remove the red line from the chart, we need to change the color of the line to ’transparent’.

df_long <- df %>% 
  pivot_longer(
    cols = -model
  )

df_long %>% 
  filter(name != "cost") %>% 
  plot_ly(x = ~model, y = ~value, color = ~name, type = "bar", 
          customdata = ~name, colors = c("blue", "gray"),
          hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                 "Name: %{customdata}&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
  add_lines(inherit = F, data = df, x = ~model, 
            y = ~cost, color = I("transparent"),
            name = "cost",
            hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                   "Name: cost&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
  add_annotations(data = df, x = ~model, y = ~cost, text = ~cost,
                  bgcolor = "white", bordercolor = "black", 
                  xshift = 15, yshift = 15, showarrow = F) %&gt;% 
  layout(barmode = "group",
         shapes = list(type = "line", x0 = 0, x1 = 1, xref = "paper",
                       y0 = mean(df$share), y1 = mean(df$share),
                       line = list(color = "red"),
                       name = "Average Share")) -&gt; pL

To add average value of ‘share’ as a horizontal line, we need to use the add_shape function in Plotly.

df_long %>% 
  filter(name != "cost") %>% 
  plot_ly(x = ~model, y = ~value, color = ~name, type = "bar", 
          customdata = ~name, colors = c("blue", "gray"),
          hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                 "Name: %{customdata}&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
  add_lines(inherit = F, data = df, x = ~model, 
            y = ~cost, color = I("transparent"),
            name = "cost",
            hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                   "Name: cost&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
  add_annotations(data = df, x = ~model, y = ~cost, text = ~cost,
                  bgcolor = "white", bordercolor = "black", 
                  xshift = 15, yshift = 15, showarrow = F) %&gt;% 
  layout(barmode = "group",
         shapes = list(type = "line", x0 = 0, x1 = 1, xref = "paper",
                       y0 = mean(df$share), y1 = mean(df$share),
                       line = list(color = "red"),
                       name = "Average Share")) %&gt;% 
  add_shape(x0 = 0, x1 = 1, xref = "paper", 
            y0 = mean(df$share), y1 = mean(df$share),
            line = list(color = "blue", dash = "dash"),
            name = "Average Share Line") %&gt;% pL

Step 3: Adding Interactivity to the Chart

To add interactivity to the chart, we need to use the htmlwidgets::onRender function in Plotly.

pL <- renderPlotly({
  df_long %>% 
    filter(name != "cost") %>% 
    plot_ly(x = ~model, y = ~value, color = ~name, type = "bar", 
            customdata = ~name, colors = c("blue", "gray"),
            hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                   "Name: %{customdata}&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
    add_lines(inherit = F, data = df, x = ~model, 
              y = ~cost, color = I("transparent"),
              name = "cost",
              hovertemplate = paste0("Model: %{x}&lt;br&gt;Value: %{y}&lt;br&gt;",
                                     "Name: cost&lt;extra&gt;&lt;/extra&gt;")) %&gt;% 
    add_annotations(data = df, x = ~model, y = ~cost, text = ~cost,
                    bgcolor = "white", bordercolor = "black", 
                    xshift = 15, yshift = 15, showarrow = F) %&gt;% 
    layout(barmode = "group",
           shapes = list(type = "line", x0 = 0, x1 = 1, xref = "paper",
                         y0 = mean(df$share), y1 = mean(df$share),
                         line = list(color = "red"),
                         name = "Average Share")) %&gt;% 
    add_shape(x0 = 0, x1 = 1, xref = "paper", 
              y0 = mean(df$share), y1 = mean(df$share),
              line = list(color = "blue", dash = "dash"),
              name = "Average Share Line") %&gt;% 
  htmlwidgets::onRender(or)
})

Conclusion

In this article, we demonstrated how to customize a bar chart in Plotly R by removing the red line from the chart and adding average value of ‘share’ as a horizontal line. We also added interactivity to the chart using the htmlwidgets::onRender function.

Last modified on 2024-10-21