Incremental, “Vega-ish” visualization runtime + chart building blocks.

Vizir is a small family of crates designed to be combined in different stacks over time. The focus is on clean separation of concerns, pluggable performance trade‑offs, and long‑term architectural stability.

• vizir_core

  • #![no_std] + alloc incremental evaluation core.
  • Versioned inputs: Table (row keys + optional column accessor) and typed Signal<T>.
  • Stable identity via MarkId, and diffs Enter/Update/Exit keyed by MarkId.
  • Mark primitives: Rect, Path, Text (unshaped), plus z_index for ordering.

• vizir_charts

  • #![no_std] + alloc chart building blocks that generate vizir_core::Marks.
  • Scales: ScaleLinear, ScaleBand (v1).
  • Guides: AxisSpec (Vega-style orient), LegendSwatchesSpec (now supports columns).
  • Mark specs (Swift Charts / Vega-inspired): BarMarkSpec, LineMarkSpec, PointMarkSpec, AreaMarkSpec, RuleMarkSpec, SectorMarkSpec, plus RectMarkSpec/TextMarkSpec.

• vizir_charts_demo

  • A tiny demo binary that emits SVG dumps: bar.svg, scatter.svg, line.svg, area.svg, sector.svg.
  • This crate can depend on std and is where we experiment with renderer adapters.

• vizir_examples

  • Scratch/example binaries (kept separate from core crates).

• Long-term architecture over short-term compatibility.
• Keep core crates no_std-first and minimize dependencies.
• Keep rendering out of the core: consumers apply MarkDiff to their own display/imaging layers.
• Prefer stable identity + diffs over rebuilding whole scenes.

Living roadmap/design notes live in plans/:

• plans/README.md

• Run the demo SVG emitter:
  • cargo run -p vizir_charts_demo
• Validate the workspace:
  • cargo fmt --all
  • cargo clippy --workspace --all-targets --all-features -- -D warnings
  • cargo test --workspace --all-features

• Minimum supported Rust: 1.88.
• Dual-licensed under Apache‑2.0 and MIT.