nordisk/facett

facett-graphpan — crate card

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

• One-line pitch: The bare, domain-agnostic pan/zoom graph CANVAS: a free draw_graph/draw_graph_scrolled function that paints a caller-laid-out GraphModel with pan/drag + scroll-zoom + click-to-select.
• Does: The host calls draw_graph each frame against a caller-owned GraphView transform (pan/zoom/selection survive frames); draw_graph_scrolled is the honest-scrollbar variant for a static board; content_extent sizes it. downstream_of lights a clicked node's downstream subtree. Optional opaque Decorations overlay (status rings + corner badges + emphasis cut-edges). Also ships an owning GraphPanView Facet (local()/remote()/state_json). Adopted verbatim from nornir's graph_render.rs (Architecture board + release dashboard), with eframe::egui swapped for plain egui.
• Key deps: facett-core (Facet, theme), egui, serde_json.
• Shape: lib, single module (~996 lines). Key types: GraphNode/GraphEdge/GraphModel, Decorations/NodeDecoration, GraphView, GraphResponse, GraphPanView; free fns draw_graph, draw_graph_scrolled, content_extent, downstream_of.
• Observed role in the workspace: The minimal "paint this model, return what was clicked" routine — complementary to facett-graphview (the consolidated CPU/GPU render engine + owning Facet). Caller owns layout; nothing nornir-specific crosses the seam.

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: