output
github_document

visualizeR

What a color! What a viz!

visualizeR proposes some utils to sane colors, ready-to-go color palettes, and a few visualization functions. The package is thoroughly tested with comprehensive code coverage.

Installation

You can install the last version of visualizeR from GitHub with:

# install.packages("devtools")
devtools::install_github("gnoblet/visualizeR", build_vignettes = TRUE)

Roadmap

Roadmap is as follows:

• Full revamp of core functions (colors, pattern, incl. adding test and pre-commit structures)
• Add test coverage reporting via codecov
• Maintain >80% test coverage across all functions
• Add other types of plots:
  • Dumbell
  • Waffle
  • Donut
  • Alluvial

Request

Please, do not hesitate to pull request any new viz or colors or color palettes, or to email request any change (gnoblet@zaclys.net{.email}).

Code Coverage

visualizeR uses codecov for test coverage reporting. You can see the current coverage status by clicking on the codecov badge at the top of this README. We aim to maintain high test coverage to ensure code reliability and stability.

Colors

Functions to access colors and palettes are color() or palette(). Feel free to pull request new colors.

library(visualizeR)

# Get all saved colors, named
color(unname = F)[1:10]
#>           white    lighter_grey      light_grey       dark_grey light_blue_grey 
#>       "#FFFFFF"       "#F5F5F5"       "#E3E3E3"       "#464647"       "#B3C6D1" 
#>            grey           black  cat_2_yellow_1  cat_2_yellow_2   cat_2_light_1 
#>       "#71716F"       "#000000"       "#ffc20a"       "#0c7bdc"       "#fefe62"

# Extract a color palette as hexadecimal codes and reversed
palette(palette = "cat_5_main", reversed = TRUE, color_ramp_palette = FALSE)
#> [1] "#083d77" "#4ecdc4" "#f4c095" "#b47eb3" "#ffd5ff"

# Get all color palettes names
palette(show_palettes = TRUE)
#>  [1] "cat_2_yellow"            "cat_2_light"            
#>  [3] "cat_2_green"             "cat_2_blue"             
#>  [5] "cat_5_main"              "cat_5_ibm"              
#>  [7] "cat_3_aquamarine"        "cat_3_tol_high_contrast"
#>  [9] "cat_8_tol_adapted"       "cat_3_custom_1"         
#> [11] "cat_4_custom_1"          "cat_5_custom_1"         
#> [13] "cat_6_custom_1"          "div_5_orange_blue"      
#> [15] "div_5_green_purple"

Charts

Example 1: Bar chart

library(palmerpenguins)
library(dplyr)

df <- penguins |>
  group_by(island, species) |>
  summarize(
    mean_bl = mean(bill_length_mm, na.rm = T),
    mean_fl = mean(flipper_length_mm, na.rm = T)
  ) |>
  ungroup()

df_island <- penguins |>
  group_by(island) |>
  summarize(
    mean_bl = mean(bill_length_mm, na.rm = T),
    mean_fl = mean(flipper_length_mm, na.rm = T)
  ) |>
  ungroup()

# Simple bar chart by group with some alpha transparency
bar(df, "island", "mean_bl", "species", x_title = "Mean of bill length", title = "Mean of bill length by island and species")

plot of chunk example-bar-chart

# Flipped / Horizontal
hbar(df, "island", "mean_bl", "species", x_title = "Mean of bill length", title = "Mean of bill length by island and species")

plot of chunk example-bar-chart

# Facetted
bar(df, "island", "mean_bl", facet = "species", x_title = "Mean of bill length", title = "Mean of bill length by island and species", add_color_guide = FALSE)

plot of chunk example-bar-chart

#  Flipped, with text, smaller width, and caption
hbar(df = df_island, x = "island", y = "mean_bl", title = "Mean of bill length by island", add_text = T, width = 0.6, add_text_suffix = "mm", add_text_expand_limit = 1.3, add_color_guide = FALSE, caption = "Data: palmerpenguins package.")

plot of chunk example-bar-chart

Example 2: Scatterplot

# Simple scatterplot
point(penguins, "bill_length_mm", "flipper_length_mm")

plot of chunk example-point-chart

# Scatterplot with grouping colors, greater dot size, some transparency
point(penguins, "bill_length_mm", "flipper_length_mm", "island", group_title = "Island", alpha = 0.6, size = 3, title = "Bill vs. flipper length", , add_color_guide = FALSE)

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# Facetted scatterplot by island
point(penguins, "bill_length_mm", "flipper_length_mm", "species", "island", "fixed", group_title = "Species", title = "Bill vs. flipper length by species and island", add_color_guide = FALSE)

plot of chunk example-point-chart

Example 3: Dumbbell plot

Remember to ensure that your data are in the long format and you only have two groups on the x-axis; for instance, IDP and returnee and no NA values.

# Prepare long data
df <- tibble::tibble(
  admin1 = rep(letters[1:8], 2),
  setting = c(rep(c("Rural", "Urban"), 4), rep(c("Urban", "Rural"), 4)),
  stat = rnorm(16, mean = 50, sd = 18)
) |>
  dplyr::mutate(stat = round(stat, 0))




# dumbbell(
#   df,
#   'stat',
#   'setting',
#   'admin1',
#   title = '% of HHs that reported open defecation as sanitation facility',
#   group_y_title = 'Admin 1',
#   group_x_title = 'Setting'
# )

Example 4: donut chart

# Some summarized data: % of HHs by displacement status
df <- tibble::tibble(
  status = c("Displaced", "Non displaced", "Returnee", "Don't know/Prefer not to say"),
  percentage = c(18, 65, 12, 3)
)

# Donut
# donut(df,
#   status,
#   percentage,
#   hole_size = 3,
#   add_text_suffix = '%',
#   add_text_color = color('dark_grey'),
#   add_text_treshold_display = 5,
#   x_title = 'Displacement status',
#   title = '% of HHs by displacement status'
# )

Example 5: Waffle chart

#
# waffle(df, status, percentage, x_title = 'A caption', title = 'A title', subtitle = 'A subtitle')

Example 6: Alluvial chart

# Some summarized data: % of HHs by self-reported status of displacement in 2021 and in 2022
df <- tibble::tibble(
  status_from = c(
    rep("Displaced", 4),
    rep("Non displaced", 4),
    rep("Returnee", 4),
    rep("Dnk/Pnts", 4)
  ),
  status_to = c("Displaced", "Non displaced", "Returnee", "Dnk/Pnts", "Displaced", "Non displaced", "Returnee", "Dnk/Pnts", "Displaced", "Non displaced", "Returnee", "Dnk/Pnts", "Displaced", "Non displaced", "Returnee", "Dnk/Pnts"),
  percentage = c(20, 8, 18, 1, 12, 21, 0, 2, 0, 3, 12, 1, 0, 0, 1, 1)
)

# Alluvial, here the group is the status for 2021

# alluvial(df,
#   status_from,
#   status_to,
#   percentage,
#   status_from,
#   from_levels = c("Displaced", "Non displaced", "Returnee", "Dnk/Pnts"),
#   alpha = 0.8,
#   group_title = "Status for 2021",
#   title = "% of HHs by self-reported status from 2021 to 2022"
# )

Example 7: Lollipop chart

library(tidyr)
# Prepare long data
df <- tibble::tibble(
  admin1 = replicate(15, sample(letters, 8)) |> t() |> as.data.frame() |> unite("admin1", sep = "") |> dplyr::pull(admin1),
  stat = rnorm(15, mean = 50, sd = 15)
) |>
  dplyr::mutate(stat = round(stat, 0))

# Simple vertical lollipop chart
lollipop(
  df = df,
  x = "admin1",
  y = "stat",
  flip = FALSE,
  dot_size = 3,
  y_title = "% of HHs",
  x_title = "Admin 1",
  title = "% of HHs that received humanitarian assistance"
)

plot of chunk example-lollipop-chart

# Horizontal lollipop chart with custom colors
hlollipop(
  df = df,
  x = "admin1",
  y = "stat",
  dot_size = 4,
  line_size = 1,
  add_color = color("cat_5_main_2"),
  line_color = color("cat_5_main_4"),
  y_title = "% of HHs",
  x_title = "Admin 1",
  title = "% of HHs that received humanitarian assistance"
)

plot of chunk example-lollipop-chart

# Create data for grouped lollipop - using set.seed for reproducibility
set.seed(123)
df_grouped <- tibble::tibble(
  admin1 = rep(c("A", "B", "C", "D", "E", "F"), 2),
  group = rep(c("Group A", "Group B"), each = 6),
  stat = c(rnorm(6, mean = 40, sd = 10), rnorm(6, mean = 60, sd = 10))
) |>
  dplyr::mutate(stat = round(stat, 0))

# Grouped lollipop chart with proper side-by-side positioning
lollipop(
  df = df_grouped,
  x = "admin1",
  y = "stat",
  group = "group",
  order = "grouped_y",
  dodge_width = 0.8, # Control spacing between grouped lollipops
  dot_size = 3.5,
  line_size = 0.8,
  y_title = "Value",
  x_title = "Category",
  title = "True side-by-side grouped lollipop chart"
)

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# Horizontal grouped lollipop chart
hlollipop(
  df = df_grouped,
  x = "admin1",
  y = "stat",
  group = "group",
  dodge_width = 0.7, # Narrower spacing for horizontal orientation
  dot_size = 3.5,
  line_size = 0.8,
  y_title = "Category",
  x_title = "Value",
  title = "Horizontal side-by-side grouped lollipop chart"
)

plot of chunk example-lollipop-chart

Lollipop Chart Features

Lollipop charts offer several advantages:

• Clean visualization of point data with connecting lines to a baseline
• True side-by-side grouped display for easy comparison between categories
• Each lollipop maintains its position from dot to baseline
• Customizable appearance with parameters for dot size, line width, and colors
• The dodge_width parameter controls spacing between grouped lollipops

The side-by-side positioning for grouped lollipops makes them visually distinct from dumbbell plots, which typically connect related points on the same line.