🚀 Hirst Painting

A Python program that draws a Hirst-style spot painting with turtle: a 10 by 10 grid of dots, each coloured at random from a palette extracted from an image with colorgram. It is Day 18 of Udemy's 100 Days of Code course, and a small project delivered through the SQA and QC framework.

📚 Table of Contents

• Overview
• Requirements
• Setup
• Run
• Tests
• License
• Links
• Appendix: Project documents

🧭 Overview

The program opens a turtle window and draws 100 dots of size 20, 50 units apart, in 10 rows of 10, centred in the window. Each dot takes a random colour from a palette that colorgram extracts from a reference image. White shades (red, green and blue all at 240 or above) are removed from the palette, because they would be invisible on the white background. The drawing runs without animation, takes well under a second, and the window stays open until you click it.

Part	What it is for
src/hirst_painting.py	The program: the palette (extract_palette and the white-shade filter), the dot positions, the pen setup, the drawing and main
tests/test_hirst_painting.py	The tests, 40 test cases for pytest
assets/	The reference image 20260524_132700.jpg, which the palette is taken from
docs/	The project documents; see the appendix
framework/	The SQA and QC framework this project uses, a git submodule
pyproject.toml	The Python version, the pinned dependencies, and the settings of ruff, mypy and pytest

📋 Requirements

• Python 3.13 or newer, with Tk. The turtle module needs Tk to open a window. The python.org and Microsoft Store installers include it; on Debian and Ubuntu the package is python3-tk.
• A display. The program opens a window, and 10 of the 40 test cases, the ones that use Tk, need a display as well.
• colorgram.py 1.2.0, which brings Pillow, to extract the palette from the image. It is pinned in pyproject.toml.
• pytest, ruff and mypy, pinned in the dev group, to test, format, lint and type-check.
• pip 25.1 or newer, for the --group option in the setup command below.

Verified with Python 3.13.14 and Tk 8.6 on Windows 11.

🛠️ Setup

git clone ssh://git@git.tirsystem.com:10022/Tirsvad-Udemy-100-days-of-code/018-hirst-painting.git
cd 018-hirst-painting
python -m venv .venv
source .venv/bin/activate          # on Windows: .venv\Scripts\activate
python -m pip install -e . --group dev

The framework/ submodule is only needed to work on the project documents; the program and its tests do not use it. Add --recurse-submodules to the clone command if you have access to it.

▶️ Run

python src/hirst_painting.py

A window opens, the painting appears at once, and a click closes it. The image the palette is taken from is the constant REFERENCE_IMAGE_PATH in src/hirst_painting.py.

🧪 Tests

python -m pytest
python -m ruff format --check .
python -m ruff check .
python -m mypy

mypy runs in strict mode. Ten of the 40 test cases need a display for Tk; this was accepted in the review record of the code (RC-006).

📄 License

GNU Affero General Public License v3.0; see LICENSE.

🔗 Links

• Repository
• Documentation
• Issue tracker

📎 Appendix: Project documents

The documents a newcomer needs, in reading order.

Document	What it tells you
Business Case	Why the project exists, its scope and success criteria
Stakeholder Analysis	Who is involved; the stakeholder IDs used for owners and reviewers
Project Plan	The gateways, their schedule and the Go/No-Go decisions
Milestones	One document per gateway: Go/No-Go criteria and tasks
Review records	One record per review of a document or of the code, against its quality checklist
Artifact registry	Where each artifact type lives, the next version, the PO language and domain
Framework	The SQA and QC framework this project uses, mounted as a submodule

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