A slope chart (slopegraph) visualizes changes between two or more time points by connecting values with lines across vertical axes. It emphasizes the direction and magnitude of change rather than absolute values, making it ideal for spotting increases, decreases, and rank changes at a glance. This chart type excels at before/after comparisons and highlighting which items improved or declined.
# anyplot.ai
# slope-basic: Basic Slope Chart (Slopegraph)
# Library: makie 0.21.9 | Julia 1.11.9
# Quality: 92/100 | Updated: 2026-07-26
using CairoMakie
using Colors
using Random
Random.seed!(42)
# --- Theme tokens -------------------------------------------------------
THEME = get(ENV, "ANYPLOT_THEME", "light")
PAGE_BG = THEME == "light" ? colorant"#FAF8F1" : colorant"#1A1A17"
INK = THEME == "light" ? colorant"#1A1A17" : colorant"#F0EFE8"
INK_SOFT = THEME == "light" ? colorant"#4A4A44" : colorant"#B8B7B0"
IMPRINT_INCREASE = colorant"#009E73" # brand green — gain (semantic exception: positive change)
IMPRINT_DECREASE = colorant"#AE3030" # matte red — loss (semantic exception: negative change)
# --- Data ----------------------------------------------------------------
# Customer satisfaction score (0-100) for 10 product lines, comparing the
# 2023 and 2024 annual surveys.
products = [
"Cloud Storage", "Mobile App", "Analytics Suite", "Payment Gateway",
"Support Chat", "API Platform", "Video Conferencing", "Data Backup",
"Email Client", "Customer Portal",
]
n = length(products)
score_2023 = round.(rand(n) .* 35 .+ 48, digits=1)
change = round.(randn(n) .* 8, digits=1)
score_2024 = round.(clamp.(score_2023 .+ change, 0, 100), digits=1)
order = sortperm(score_2023, rev=true)
products, score_2023, score_2024 = products[order], score_2023[order], score_2024[order]
y_min, y_max = minimum(vcat(score_2023, score_2024)), maximum(vcat(score_2023, score_2024))
y_pad = (y_max - y_min) * 0.12
ylim_lo, ylim_hi = y_min - y_pad, y_max + y_pad * 2.2
# Nudge label y-positions apart (independent of true marker/line position)
# so entity names don't overlap when two scores land close together.
min_gap = (ylim_hi - ylim_lo) * 0.052
label_y_left = copy(score_2023)
left_order = sortperm(label_y_left)
for _ in 1:200
moved = false
for k in 1:(n - 1)
i, j = left_order[k], left_order[k + 1]
if label_y_left[j] - label_y_left[i] < min_gap
center = (label_y_left[i] + label_y_left[j]) / 2
label_y_left[i] = center - min_gap / 2
label_y_left[j] = center + min_gap / 2
moved = true
end
end
moved || break
end
label_y_right = copy(score_2024)
right_order = sortperm(label_y_right)
for _ in 1:200
moved = false
for k in 1:(n - 1)
i, j = right_order[k], right_order[k + 1]
if label_y_right[j] - label_y_right[i] < min_gap
center = (label_y_right[i] + label_y_right[j]) / 2
label_y_right[i] = center - min_gap / 2
label_y_right[j] = center + min_gap / 2
moved = true
end
end
moved || break
end
# --- Plot ------------------------------------------------------------------
fig = Figure(
resolution = (1600, 900),
fontsize = 14,
backgroundcolor = PAGE_BG,
)
title_text = "slope-basic · julia · makie · anyplot.ai"
ax = Axis(
fig[1, 1];
title = title_text,
titlesize = 20,
titlecolor = INK,
subtitle = "Customer Satisfaction Score (0–100)",
subtitlesize = 14,
subtitlecolor = INK_SOFT,
backgroundcolor = PAGE_BG,
)
hidedecorations!(ax)
hidespines!(ax)
xlims!(ax, -0.85, 1.85)
ylims!(ax, ylim_lo, ylim_hi)
# The two vertical reference axes, one per survey year
vlines!(ax, [0, 1]; color=INK_SOFT, linewidth=1.5)
for i in 1:n
rising = score_2024[i] >= score_2023[i]
color = rising ? IMPRINT_INCREASE : IMPRINT_DECREASE
label = rising ? "Increase" : "Decrease"
arrow = rising ? "▲" : "▼"
lines!(ax, [0, 1], [score_2023[i], score_2024[i]];
color=color, linewidth=2.8, label=label)
scatter!(ax, [0, 1], [score_2023[i], score_2024[i]];
color=color, markersize=13, strokewidth=1.5, strokecolor=PAGE_BG)
# Leader stubs: connect a nudged label back to its true marker position
# whenever the anti-collision loop moved it, so the label-to-line link
# stays traceable even when several labels cluster in a dense band.
if abs(label_y_left[i] - score_2023[i]) > 1e-6
lines!(ax, [-0.05, 0], [label_y_left[i], score_2023[i]];
color=INK_SOFT, linewidth=0.75, linestyle=:dot)
end
if abs(label_y_right[i] - score_2024[i]) > 1e-6
lines!(ax, [1, 1.05], [score_2024[i], label_y_right[i]];
color=INK_SOFT, linewidth=0.75, linestyle=:dot)
end
text!(ax, -0.05, label_y_left[i]; text="$(products[i]) $(score_2023[i])",
align=(:right, :center), color=INK, fontsize=15)
text!(ax, 1.05, label_y_right[i]; text="$(arrow) $(score_2024[i]) $(products[i])",
align=(:left, :center), color=INK, fontsize=15)
end
# Survey-year headers atop each vertical axis
text!(ax, 0, ylim_hi - y_pad * 0.5; text="2023 Survey", align=(:center, :bottom),
color=INK_SOFT, fontsize=15, font=:bold)
text!(ax, 1, ylim_hi - y_pad * 0.5; text="2024 Survey", align=(:center, :bottom),
color=INK_SOFT, fontsize=15, font=:bold)
Legend(fig[1, 2], ax; merge=true, unique=true, framevisible=false,
labelcolor=INK, labelsize=13, patchsize=(22, 3), tellheight=false, valign=:center)
colsize!(fig.layout, 2, Fixed(105))
# --- Save --------------------------------------------------------------
save("plot-$(THEME).png", fig; px_per_unit=2)
Part of Basic Slope Chart (Slopegraph) on anyplot.ai.