# Changelog for Data Visualization

All notable changes to this module will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

### Added

- Initial plotting functions in `plotter.py` using Matplotlib:
  - `create_line_plot()` for single and multiple line plots.
  - `create_scatter_plot()` for scatter plots.
  - `create_bar_chart()` for vertical and horizontal bar charts.
  - `create_histogram()` for histograms.
  - `create_pie_chart()` for pie charts.
- Integration with `logging_monitoring` for all logging.
- Integration with `environment_setup` for environment and dependency checks.
- `create_heatmap()` function for heatmap visualizations.
- Improved modularity: all plotting functions in separate files, dispatched via `plotter.py`.
- Expanded documentation and usage examples for all visualizations.
- `matplotlib` added to `pyproject.toml`.
- Comprehensive `README.md`, `API_SPECIFICATION.md`, and `USAGE_EXAMPLES.md`.
- **NEW: Git Visualization Capabilities**:
  - `mermaid_generator.py` module for Mermaid diagram generation
  - `git_visualizer.py` module for comprehensive Git repository analysis
  - `MermaidDiagramGenerator` class with support for gitgraph, flowchart, timeline, and structure diagrams
  - `GitVisualizer` class for PNG and Mermaid Git visualizations
  - `visualize_git_repository()` comprehensive repository analysis function
  - `create_git_tree_png()` for PNG Git branch tree visualizations
  - `create_git_tree_mermaid()` for Mermaid Git branch diagrams
  - `create_git_branch_diagram()` for gitgraph diagrams
  - `create_git_workflow_diagram()` for workflow flowcharts
  - `create_repository_structure_diagram()` for directory structure graphs
  - `create_commit_timeline_diagram()` for commit history timelines
  - Integration with `git_operations` module for live Git data
  - Support for both sample data and real Git repository analysis
  - Comprehensive test coverage with unit and integration tests

### Changed

-

### Deprecated

-

### Removed

-

### Fixed

-

### Security

-

## [Version X.Y.Z] - YYYY-MM-DD

### Added

- Feature A.

### Changed

- Enhancement B.

### Fixed

- Bug C.

## Navigation Links

- **Parent**: [Project Overview](../README.md)
- **Module Index**: [All Agents](../../AGENTS.md)
- **Documentation**: [Reference Guides](../../../docs/README.md)
- **Home**: [Root README](../../../README.md)
