Interactive candlestick chart plotting with PyQt6 — drop-in replacement for mplfinance with rich interactivity.

Features

• 📈 Candlestick, OHLC bar, line, and hollow-candle chart types
• 📊 Optional volume subplot
• 🔍 Mouse-wheel zoom and click-drag pan
• 🎯 Crosshair cursor with live OHLC / volume readout
• 📐 Moving average overlays (mav parameter)
• 🎨 Built-in styles (default, charles, mike, yahoo, classic, nightclouds)
• 🖼️ make_addplot() for overlaying custom data (line, scatter & segments)
• 🔀 make_segments() for overlapping broken-line overlays (e.g. Knoxville Divergence)
• 💾 savefig() support (PNG / JPG / BMP)
• 🔁 returnfig mode for embedding in your own PyQt6 application
• 🔴 live_plot() for animated / live-updating charts
• ✅ mplfinance-compatible function signatures

Installation

Install from PyPI

The recommended way to install wickly:

pip install wickly

Install from source

Clone the repository and install with pip:

git clone https://github.com/ShreyanshDarshan/wickly.git
cd wickly
pip install .

Or in editable/development mode (includes pytest and build):

pip install -e ".[dev]"

Quick Start

import pandas as pd
import wickly

# DataFrame must have a DatetimeIndex and columns: Open, High, Low, Close (and optionally Volume)
df = pd.read_csv("your_data.csv", index_col=0, parse_dates=True)

# Candlestick chart with volume and moving averages — same API as mplfinance
wickly.plot(df, type='candle', volume=True, mav=(10, 20), style='yahoo', title='My Chart')

Documentation

Full API reference, quickstart guide, and examples are available at wickly.readthedocs.io.

Contributing

Contributions are welcome — bug reports, feature requests, documentation improvements, and pull requests all appreciated.

1. Fork & clone

git clone https://github.com/ShreyanshDarshan/wickly.git
cd wickly

2. Set up the development environment

Create and activate a dedicated environment (conda shown; plain venv works too):

conda create -n wickly python=3.11
conda activate wickly
pip install -e ".[dev,docs]"

3. Project layout

wickly/
├── src/wickly/          # Package source
│   ├── __init__.py      # Public API surface
│   ├── plotting.py      # Top-level plot() function
│   ├── chart_widget.py  # PyQt6 CandlestickWidget
│   ├── addplot.py       # make_addplot() & make_segments() helpers
│   ├── styles.py        # Built-in styles & make_style()
│   └── _utils.py        # Data validation utilities
├── tests/               # pytest test suite
├── docs/                # Sphinx documentation source
├── examples/            # Runnable example scripts
├── pyproject.toml       # Project metadata & dependencies
└── .readthedocs.yaml    # Read the Docs configuration

4. Run the tests

pytest tests/ -v

All 41 tests should pass. Add new tests under tests/ for any code you contribute.

5. Build the documentation locally

# HTML output → docs/_build/html/index.html
python -m sphinx -b html docs docs/_build/html

# Open in the default browser (Windows)
start docs/_build/html/index.html

# Open in the default browser (macOS / Linux)
open docs/_build/html/index.html

Build must succeed with zero warnings (-W flag):

python -m sphinx -b html docs docs/_build/html -W

6. Run the examples

python examples/basic_candle.py        # Basic candlestick + volume + MAs
python examples/chart_types.py         # All four chart types in sequence
python examples/addplot_overlay.py     # Bollinger Bands & scatter signals
python examples/live_chart.py          # Live / animated chart demo

7. Adding a new built-in style

1. Add an entry to _BUILTIN_STYLES in src/wickly/styles.py following the existing key schema.
2. Add the style name to TestAvailableStyles.test_all_builtins_present in tests/test_styles.py.
3. Document it in the styles table in docs/styles.rst.

8. Code style

• Format with black (pip install black; black src/ tests/).
• Type-annotate all public functions.
• Write NumPy-style docstrings — they are picked up by Sphinx autodoc.

9. Submitting a pull request

1. Branch off main: git checkout -b feat/my-feature
2. Make your changes, add tests, update docs.
3. Ensure pytest tests/ -v is all green and sphinx -W builds cleanly.
4. Open a PR against main with a clear description of what changed and why.

License

MIT