∞ forever components

Inputs & Switches

Crown Dial

Cream drum dial with engraved tick bars scrolling as it rotates; a milled crown wheel ratchets on drag or click. Numeric readout below.

canvasmedium complexitymoderate motionpointer

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When to use it

Precision numeric inputs with a tactile, mechanical aesthetic. Retro instrument panels, settings UIs, watch-themed interfaces.

When not to

Touch-only mobile where drag conflicts with scroll. Fast data-entry forms where keyboard input is expected.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Change TEETH from 24 to 12 to halve ratchet steps, set ACC to '#8B0000' for burgundy engraving, and slow auto-ratchet interval to 300 frames. Theme: dark tokens live in :root, the light variant in :root[data-theme="light"]; ?theme=light or a {type:'forever:theme'} postMessage switches at runtime.

Safe to edit

  • tooth count (TEETH=24)
  • spring friction (0.22 lerp factor)
  • accent color (ACC='#1a1a2e')
  • drum size (R*0.30)
  • auto-ratchet interval (140+random*120)
  • crown knurling count (KN=18)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • IIFE wrapper
  • prefers-reduced-motion guard and static fallback
  • visibilitychange stop/start
  • DPR-aware canvas sizing
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)

Known limitations

  • Pointer drag threshold (14px) may fire multiple ratchets per swipe on high-DPI trackpads
  • Auto-ratchet changes direction randomly — remove auto block for production use
  • Background color hardcoded in CSS (#f4ede0) — must edit to change theme

dialwatchknobcanvasratchetmechanicalpointer

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