A stacked area chart normalized to 100%, where each area represents the percentage contribution of a category to the total. The combined height always equals 100%, showing proportional changes over time.
""" anyplot.ai
area-stacked-percent: 100% Stacked Area Chart
Library: pygal 3.1.0 | Python 3.13.13
Quality: 81/100 | Updated: 2026-05-12
"""
import pygal
from pygal.style import Style
# Data - Market share evolution for tech product categories
years = ["2018", "2019", "2020", "2021", "2022", "2023", "2024"]
smartphones = [42, 40, 38, 36, 35, 33, 32]
laptops = [28, 27, 26, 25, 24, 23, 22]
tablets = [18, 19, 20, 21, 21, 22, 22]
wearables = [8, 10, 12, 14, 16, 18, 20]
accessories = [4, 4, 4, 4, 4, 4, 4]
# Custom style for large canvas
custom_style = Style(
background="white",
plot_background="white",
foreground="#333333",
foreground_strong="#333333",
foreground_subtle="#666666",
colors=("#306998", "#FFD43B", "#3CB371", "#FF6B6B", "#9B59B6"),
title_font_size=72,
label_font_size=48,
major_label_font_size=42,
legend_font_size=42,
value_font_size=36,
opacity=0.85,
opacity_hover=0.95,
transition="250ms ease-in",
)
# Create stacked area chart with percentage mode
chart = pygal.StackedLine(
width=4800,
height=2700,
style=custom_style,
title="area-stacked-percent · pygal · pyplots.ai",
x_title="Year",
y_title="Market Share (%)",
fill=True,
stack_from_top=False,
show_y_guides=True,
show_x_guides=False,
y_labels_major_every=2,
truncate_legend=-1,
legend_at_bottom=False,
legend_box_size=30,
margin=50,
spacing=40,
dots_size=8,
stroke_style={"width": 3},
)
# Set x-axis labels
chart.x_labels = years
# Add data series (values already sum to 100% each year)
chart.add("Smartphones", smartphones)
chart.add("Laptops", laptops)
chart.add("Tablets", tablets)
chart.add("Wearables", wearables)
chart.add("Accessories", accessories)
# Save as PNG and HTML
chart.render_to_png("plot.png")
chart.render_to_file("plot.html")
Part of 100% Stacked Area Chart on anyplot.ai.