PhysicsRegistry — discovery, descriptors, and change events

[flyingrobots]

PhysicsRegistry — discovery, descriptors, and change events

Labels: architecture, physics, registry, project:newton
Milestone: PROJECT: Newton

Summary

Design and implement a PhysicsRegistry that discovers DOM nodes, stores typed descriptors (type, tag, attrs, origins), emits change events on layout/resize, and serves as the single source of truth for activation/reset/inspector.

Acceptance Criteria

• Discovers .cloth-enabled, .rigid-dynamic, .rigid-static and nodes with data-phys-* or data-cloth-* attributes
• Descriptor includes: { id, tag, type, attrs (parsed), origin (rect/world), active state }
• Emits events: registry:add, registry:update, registry:remove with prior/next descriptors
• Diffing works: only changed fields emitted; stable ids across runs
• Inspector/activation can subscribe to the registry

Tests (write first)

• physicsRegistry.spec: discovery from a test DOM, descriptor diffing, events on resize
• integration: inspector or controller subscribes and receives registry:update