A grid of subplots where each cell shows the same type of plot for a different subset of data, split by one or two categorical variables. Enables systematic comparison across multiple dimensions.
# anyplot.ai
# facet-grid: Faceted Grid Plot
# Library: makie 0.21.9 | Julia 1.11.9
# Quality: 92/100 | Created: 2026-09-05
using CairoMakie
using Colors
using Random
Random.seed!(42)
# --- Theme tokens ------------------------------------------------------------
const THEME = get(ENV, "ANYPLOT_THEME", "light")
const PAGE_BG = THEME == "light" ? colorant"#FAF8F1" : colorant"#1A1A17"
const ELEVATED_BG = THEME == "light" ? colorant"#FFFDF6" : colorant"#242420"
const INK = THEME == "light" ? colorant"#1A1A17" : colorant"#F0EFE8"
const INK_SOFT = THEME == "light" ? colorant"#4A4A44" : colorant"#B8B7B0"
const BRAND = colorant"#009E73"
# --- Data ----------------------------------------------------------------
# Synthetic penguin bill measurements, faceted by species (columns) and sex
# (rows) — mirrors real Palmer Penguins sexual-dimorphism patterns.
const SPECIES = ["Adelie", "Chinstrap", "Gentoo"]
const SEXES = ["Female", "Male"]
const N_PER_FACET = 150
const LENGTH_MEAN = Dict("Adelie" => 38.8, "Chinstrap" => 48.8, "Gentoo" => 47.5)
const LENGTH_SD = Dict("Adelie" => 2.7, "Chinstrap" => 3.3, "Gentoo" => 3.1)
const DEPTH_MEAN = Dict("Adelie" => 18.3, "Chinstrap" => 18.4, "Gentoo" => 15.0)
const DEPTH_SD = Dict("Adelie" => 1.2, "Chinstrap" => 1.1, "Gentoo" => 1.0)
const LENGTH_SEX_OFFSET = 4.0 # males have longer bills on average
const DEPTH_SEX_OFFSET = 1.0 # males have deeper bills on average
bill_length = Dict{Tuple{String,String},Vector{Float64}}()
bill_depth = Dict{Tuple{String,String},Vector{Float64}}()
for species in SPECIES, sex in SEXES
sign = sex == "Male" ? 1 : -1
bill_length[(species, sex)] =
LENGTH_MEAN[species] .+ sign * LENGTH_SEX_OFFSET / 2 .+
randn(N_PER_FACET) .* LENGTH_SD[species]
bill_depth[(species, sex)] =
DEPTH_MEAN[species] .+ sign * DEPTH_SEX_OFFSET / 2 .+
randn(N_PER_FACET) .* DEPTH_SD[species]
end
# --- Plot ------------------------------------------------------------------
fig = Figure(
resolution = (1600, 900),
fontsize = 14,
backgroundcolor = PAGE_BG,
)
n_cols = length(SPECIES)
n_rows = length(SEXES)
title_row = 1
strip_row = 2
first_ax_row = 3
xlabel_row = first_ax_row + n_rows
strip_col = n_cols + 1
ylabel_col = 0
Label(
fig[title_row, 1:n_cols],
"facet-grid · julia · makie · anyplot.ai";
fontsize = 20, color = INK, tellwidth = false,
)
# Column strips — species
for (j, species) in enumerate(SPECIES)
Box(fig[strip_row, j]; color = ELEVATED_BG, strokewidth = 0)
Label(fig[strip_row, j], species; fontsize = 15, color = INK, tellwidth = false)
end
axes = Matrix{Axis}(undef, n_rows, n_cols)
for (i, sex) in enumerate(SEXES)
row = first_ax_row + i - 1
# Row strip — sex
Box(fig[row, strip_col]; color = ELEVATED_BG, strokewidth = 0)
Label(
fig[row, strip_col], sex;
fontsize = 15, color = INK, rotation = -pi / 2, tellheight = false,
)
for (j, species) in enumerate(SPECIES)
ax = Axis(
fig[row, j];
backgroundcolor = PAGE_BG,
xticklabelsize = 13,
yticklabelsize = 13,
xticklabelcolor = INK_SOFT,
yticklabelcolor = INK_SOFT,
xtickcolor = INK_SOFT,
ytickcolor = INK_SOFT,
leftspinecolor = INK_SOFT,
bottomspinecolor = INK_SOFT,
topspinevisible = false,
rightspinevisible = false,
xgridcolor = RGBAf(INK.r, INK.g, INK.b, 0.12),
ygridcolor = RGBAf(INK.r, INK.g, INK.b, 0.12),
xminorgridvisible = false,
yminorgridvisible = false,
)
scatter!(
ax, bill_length[(species, sex)], bill_depth[(species, sex)];
color = BRAND, markersize = 10, alpha = 0.6, strokewidth = 0,
)
text!(
ax, 0.96, 0.96;
text = "n=$(N_PER_FACET)", space = :relative,
align = (:right, :top), fontsize = 11, color = INK_SOFT,
)
j != 1 && hideydecorations!(ax; grid = false)
i != n_rows && hidexdecorations!(ax; grid = false)
axes[i, j] = ax
end
end
linkxaxes!(axes...)
linkyaxes!(axes...)
Label(
fig[xlabel_row, 1:n_cols], "Bill Length (mm)";
fontsize = 14, color = INK, tellwidth = false,
)
Label(
fig[first_ax_row:(first_ax_row + n_rows - 1), ylabel_col], "Bill Depth (mm)";
fontsize = 14, color = INK, rotation = pi / 2, tellheight = false,
)
rowsize!(fig.layout, title_row, Relative(0.09))
rowsize!(fig.layout, strip_row, Relative(0.06))
rowsize!(fig.layout, xlabel_row, Relative(0.06))
colsize!(fig.layout, strip_col, Relative(0.05))
colsize!(fig.layout, ylabel_col, Relative(0.05))
colgap!(fig.layout, 8)
rowgap!(fig.layout, 8)
# --- Save --------------------------------------------------------------------
save("plot-$(THEME).png", fig; px_per_unit = 2)
Runnable source as JSON, for any HTTP client: https://api.anyplot.ai/specs/facet-grid/makie/code. Any spec id and library id listed in llms-full.txt fit the same URL shape; every URL below is complete and callable.
{
"spec_id": "facet-grid",
"language": "julia",
"library": "makie",
"page": "https://anyplot.ai/facet-grid/julia/makie",
"hub": "https://anyplot.ai/facet-grid",
"code_json": "https://api.anyplot.ai/specs/facet-grid/makie/code",
"spec_json": "https://api.anyplot.ai/specs/facet-grid",
"render_light_png": "https://storage.googleapis.com/anyplot-images/plots/facet-grid/julia/makie/plot-light.png",
"render_dark_png": "https://storage.googleapis.com/anyplot-images/plots/facet-grid/julia/makie/plot-dark.png",
"quality_score": 92.0,
"license": "MIT",
"guide": "https://anyplot.ai/llms.txt"
}Part of Faceted Grid Plot on anyplot.ai.