nordisk/facett

facett-plotters — crate card

Reverse-engineered (from source — verify, don't trust the name)

• One-line pitch: The everyday XY chart (line/bar/scatter) plus the analytics chart types egui_plot lacks — box/violin/heatmap/candlestick/treemap — all hand-painted in immediate mode on egui::Painter, themeable, with a validated categorical palette + theme-derived colour ramps.
• Does: ChartView (line/bar/scatter over Vec<Series{label, points:(x,y)}>; derived axis bounds/gridlines/legend/tooltip; series-coloured from palette::series_color — a small VALIDATED categorical set in fixed slot order, light/dark steps picked by the theme surface, never a hash; ChartKind switch is one Msg, observable in state_json). Plus BoxPlotView (quartiles + 1.5·IQR whiskers + outliers), ViolinView (Gaussian-KDE density silhouette), HeatmapView (matrix colour grid + gradient legend), CandlestickView (OHLC wick+body), TreemapView (squarify slice-and-dice). Each is a Facet (themeable().copyable().resizable(), copy() → CSV) with FC-4 a11y nodes. ramp::Ramp builds sequential/diverging ramps purely from the active Theme; data→geometry math lives in pure tested functions (no GPU). Deliberately NOT using the retained-mode plotters crate or egui_plot.
• Key deps: facett-core (Facet, theme, Painter path), egui, serde_json.
• Shape: lib; small (per-chart modules: boxplot/candlestick/heatmap/ramp/treemap/violin); ships a plotters_demo example.
• Observed role in the workspace: Re-exported by umbrella facett as facett::plotters. Complements facett-plot (which wraps egui_plot for line/bar).

Fill in (one line each — only the human knows these)

• Primary consumer(s):
• Why it exists (vs the obvious alternative):
• Hard constraint (airgap / no-C-deps / no-FFI / pure-Rust / etc.):
• Release cadence & independence (rides a parent? own repo someday?):
• Status (production / prototype / experimental / stubbed):
• Must-NOT-change invariant:
• Biggest known gap or TODO:
• Anything a newcomer would get wrong about it: