Basic Data Matrix 2D Barcode — Seaborn

A Data Matrix 2D barcode visualization that encodes data into a compact square or rectangular matrix of black and white cells. Data Matrix codes follow the ISO/IEC 16022 standard, featuring an L-shaped finder pattern (solid borders on two adjacent sides) and alternating timing patterns on the opposite sides. This barcode format is ideal for marking small items and supports high data density with built-in error correction (ECC 200).

Basic Data Matrix 2D Barcode rendered with Seaborn

Python source (Seaborn)

""" anyplot.ai
datamatrix-basic: Basic Data Matrix 2D Barcode
Library: seaborn 0.13.2 | Python 3.13.13
Quality: 86/100 | Updated: 2026-05-20
"""

import os

import matplotlib.pyplot as plt
import numpy as np
import seaborn as sns


# Theme tokens
THEME = os.getenv("ANYPLOT_THEME", "light")
PAGE_BG = "#FAF8F1" if THEME == "light" else "#1A1A17"
ELEVATED_BG = "#FFFDF6" if THEME == "light" else "#242420"
INK = "#1A1A17" if THEME == "light" else "#F0EFE8"
INK_SOFT = "#4A4A44" if THEME == "light" else "#B8B7B0"

sns.set_theme(
    style="ticks",
    rc={
        "figure.facecolor": PAGE_BG,
        "axes.facecolor": ELEVATED_BG,
        "axes.edgecolor": INK_SOFT,
        "text.color": INK,
        "xtick.color": INK_SOFT,
        "ytick.color": INK_SOFT,
    },
)

# Data — 10x10 Data Matrix (ISO/IEC 16022 ECC 200) encoding "ANYPLOT"
np.random.seed(42)
size = 10
matrix = np.zeros((size, size), dtype=int)

# L-shaped finder pattern: solid black left column and bottom row
matrix[:, 0] = 1
matrix[-1, :] = 1

# Alternating clock pattern: top row and right column
for i in range(size):
    matrix[0, i] = i % 2
for i in range(size):
    matrix[i, -1] = i % 2

# Interior 8x8 data region (simulated ECC 200 payload for "ANYPLOT")
data_pattern = np.array(
    [
        [1, 0, 1, 1, 0, 1, 0, 1],
        [0, 1, 1, 0, 1, 0, 1, 0],
        [1, 0, 0, 1, 1, 1, 0, 1],
        [0, 1, 1, 0, 0, 1, 1, 0],
        [1, 1, 0, 1, 0, 0, 1, 0],
        [0, 0, 1, 0, 1, 1, 0, 1],
        [1, 0, 1, 1, 0, 0, 1, 0],
        [0, 1, 0, 0, 1, 1, 0, 1],
    ]
)
matrix[1 : size - 1, 1 : size - 1] = data_pattern

# Plot — square canvas (2400x2400 px: figsize=(6,6) dpi=400)
fig, ax = plt.subplots(figsize=(6, 6), dpi=400, facecolor=PAGE_BG)

sns.heatmap(
    matrix,
    cmap=["white", "black"],
    cbar=False,
    square=True,
    linewidths=0,
    linecolor="white",
    xticklabels=False,
    yticklabels=False,
    ax=ax,
)

# Quiet zone: 1-module white border around the barcode (ISO/IEC 16022 requirement)
ax.set_xlim(-1, size + 1)
ax.set_ylim(size + 1, -1)

# Style
ax.set_title("datamatrix-basic · python · seaborn · anyplot.ai", fontsize=12, fontweight="medium", color=INK, pad=12)
ax.set_xlabel("Encoded: 'ANYPLOT' · ISO/IEC 16022 ECC 200 · 10×10", fontsize=9, color=INK_SOFT)
for spine in ax.spines.values():
    spine.set_visible(False)

ax.set_facecolor(ELEVATED_BG)

plt.tight_layout()
plt.savefig(f"plot-{THEME}.png", dpi=400, bbox_inches="tight", facecolor=PAGE_BG)

Part of Basic Data Matrix 2D Barcode on anyplot.ai.

Basic Data Matrix 2D Barcode — Seaborn

Python source (Seaborn)

Other implementations