# data_visualization - Functional Specification

**Version**: v1.0.0 | **Status**: Active | **Last Updated**: February 2026

## Purpose

The `data_visualization` module provides tools to transform raw data (logs, metrics, analysis results) into human-interpretable visual formats (tables, charts, graphs). It supports both terminal-based output (ASCII/Rich) and web-based or image-based rendering for reports.

## Design Principles

### Modularity

- **Backend Agnostic**: Visualization logic should be separate from data sources.
- **Renderer Abstraction**: Support multiple renderers (Console, HTML, PNG).

### Internal Coherence

- **Consistent Styling**: All visualizations should share a common color palette and style guide (Codomyrmex branding).

### Parsimony

- **Simple API**: `plot(data, type='bar')` style ease of use.

## Architecture

```mermaid
graph TD
    Data[Raw Data] --> Adapter[Data Adapter]
    Adapter --> Engine[Vis Engine]
    Engine --> Renderer{Renderer}
    Renderer -->|Terminal| Console[Rich Output]
    Renderer -->|File| Image[PNG/SVG]
    Renderer -->|Browser| Web[HTML/JS]
```

## Functional Requirements

### Core Capabilities

1. **Rich Terminal Output**: Tables, progress bars, syntax highlighting (wrapping `rich`).
2. **Charting**: Line charts, bar graphs, scatter plots.
3. **Report Generation**: Embed charts into Markdown or HTML reports.
4. **Visualization Engine (Consolidated)**: Core rendering engine for complex plotting and theme management.

### Quality Standards

- **Responsiveness**: Terminal output must respect terminal width.
- **Accessibility**: Colors should be distinguishable.

## Interface Contracts

### Public API

- `render_table(data: List[Dict], title: str) -> None`
- `render_chart(data: Any, type: str) -> Path`: Returns path to generated image/file.

### Dependencies

- **External**: `rich`, `matplotlib` (optional), `plotly` (optional).

## Implementation Guidelines

### Usage Patterns

- Use `rich` for all real-time CLI feedback.
- Use `matplotlib`/`plotly` for static artifacts generated for artifacts/reports.

## Navigation

- **Human Documentation**: [README.md](README.md)
- **Technical Documentation**: [AGENTS.md](AGENTS.md)
- **Package SPEC**: [../SPEC.md](../SPEC.md)

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## Testing

```bash
uv run python -m pytest src/codomyrmex/tests/ -k data_visualization -v
```
