Roadmap

Done

• Research: surveyed Go SVG libraries, pygal, HTMX+SVG patterns, time/event ordering
• Decision: build new library (no existing Go lib meets all requirements)
• Project scaffolding

In Progress

• Core architecture (Scale, Layout, Render)
• Line chart (sparkline variant)

Planned

Phase 1 — Core

• Line chart (all 4 variants: sparkline, static, interactive, live)
• Bar chart (vertical, horizontal, grouped, stacked)
• Scatter/XY chart
• Scale interface with TimeScale and EventScale
• CSS-only tooltips and hover effects
• Responsive SVG (viewBox, no fixed dimensions)
• Accessibility (ARIA, title, desc)
• Basic theming (light/dark)

Phase 2 — HTMX Integration

• http.Handler helpers for chart endpoints
• Query param parsing (visible series, axis mode, zoom range)
• HTMX attribute generation for legend controls
• SSE helper for live chart updates

Phase 3 — Extended Chart Types

• Area chart (filled line)
• Pie/donut
• Heatmap
• Box plot

Phase 4 — Advanced

• Linked/synchronized views
• Cross-chart crosshair (minimal JS module)
• Drag-to-select zoom (minimal JS module)
• Gap compression / break axes
• Financial series (SMA, EMA, Bollinger)

Phase 5 — Documentation

• Documentation site with examples increasing in complexity
• WASM demos for interactive examples
• Architecture diagrams (d2)