∞ forever components

Inputs & Switches

Slide Throw Lever

Draggable orange lever slides along a coil spring that snaps home with motion-blur ghost trails and a ringing track wobble on impact.

canvasmedium complexitymoderate motionpointer

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When to use it

Game controls, industrial dashboards, or any UI needing a satisfying pull-and-release mechanical feel.

When not to

Precise binary toggles where snap-home physics could confuse state; also avoid in contexts requiring accessible keyboard control.

Working with an AI agent

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

Change the accent color from orange to electric blue by setting AC='#00eaff' and BG='#0a1020', then increase spring stiffness to 0.16 for a faster snap. 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

  • accent color (AC='#ff9e2c')
  • background color (BG='#2a0a18')
  • spring stiffness (STIFF=0.10)
  • spring damping (DAMP=0.62)
  • coil count (coils=9)
  • handle radius scale (S*0.085)
  • idle demo cadence (PULL_AT=18 / PULL=24 / HOLD=42 / CYCLE=180 / RESUME=216 frames, THROW=0.92)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • IIFE wrapper
  • prefers-reduced-motion guard with static fallback
  • visibilitychange pause/resume
  • DPR-aware canvas sizing
  • idle demo throw (same throw path as a drag; real input takes over)
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)

Known limitations

  • Click auto-nudge only fires when pos<0.05 — users may not discover the interaction without a hint
  • No aria role or keyboard support — not accessible as an interactive control

leverspringdragcanvasphysicsmotion-blurindustrial-ui

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