a11y_ggplot2_bar: Accessible bar chart

In a11yShiny: Accessibility Enhancements to Popular R Shiny Functions

Accessible bar chart

Description

A minimal wrapper for a simple bar chart with accessibility features using ggplot2::ggplot2. Provides a high-contrast color palette, black bar outlines, and a minimal theme by default.

Usage

a11y_ggplot2_bar(
  data,
  x,
  y,
  accessible_colors = NULL,
  border_color = "#000000",
  bar_width = 0.9,
  legend_title = NULL,
  ...
)

Arguments

data	Data frame
x	Column name for categories (unquoted)
y	Column name for bar heights (unquoted)
accessible_colors	(optional) Character vector of colors for the palette
border_color	(optional) Color for bar outlines (default: "#000000")
bar_width	(optional) Bar width (default: 0.9)
legend_title	(optional) Title for the legend (default: NULL)
...	Additional arguments passed to ggplot2::labs() (e.g. title, axis labels)

Value

A ggplot2::ggplot() object

Examples

df <- data.frame(
  category = c("Alpha", "Beta", "Gamma"),
  count    = c(23, 17, 31)
)
a11y_ggplot2_bar(
  data = df, x = category, y = count,
  title = "Counts by Category"
)

a11yShiny documentation built on April 1, 2026, 5:07 p.m.