∞ forever components

Particles & Physics

Verlet Rope Bridge

Amber glowing rope sags between two pegs under invisible rolling weights via Verlet physics; pointer disturbs it, clicks launch new loads.

canvasheavy complexitymoderate motionpointermobile-ready

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Live demo — the real component, running in a sandbox. One self-contained HTML file, zero dependencies. Open it on the canvas →
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When to use it

Physics demo backgrounds, portfolio heroes, ambient canvases with tactile interaction.

When not to

Layouts needing legible text overlays; low-end mobile where 14-iteration constraint relaxation per frame may stutter.

Working with an AI agent

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

Change rope color to electric blue by setting r=72, g=194, bl=240 in the velocity-tint segment loop, and raise GRAV from 0.32 to 0.55 for heavier sag. 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

  • gravity constant (GRAV=0.32)
  • damping factor (DAMP=0.985)
  • constraint iterations (ITER=14)
  • rope color base (r=240,g=194,bl=72)
  • rolling weight mass range (1.6+random*2.6)
  • weight spawn interval (120+random*150)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • IIFE wrapper
  • prefers-reduced-motion static-settle branch
  • visibilitychange pause/resume
  • DPR-aware canvas sizing
  • theme hook (?theme= bootstrap + forever:theme message listener + theme tokens)
  • demo-v1 preview lifecycle: initialize demoEnabled from window.__foreverPreview and stop attract work on the window forever:interactive event; retain manual feedback, settling, cleanup and explicit sessions

Known limitations

  • 14 constraint-relaxation iterations per frame — CPU-bound on low-end devices
  • No aria semantics on canvas element
  • Background color hardcoded in CSS (#161108)
  • State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

ropeverletphysicscanvassimulationambientglow

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