∞ forever components

Particles & Physics

Gravity Dot Rain

Multicolored dots fall under gravity with motion trails, bounce off the floor, and scatter away from the cursor on a dark navy canvas.

canvasmedium 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

Dark-mode hero backgrounds, loading screens, ambient screensaver effects with subtle physics feel.

When not to

Light-background UIs (background hardcoded dark navy). Layouts where motion competes with legible content.

Working with an AI agent

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

Increase particle count by changing N cap from 90 to 150, swap pal to warm sunset tones ['#ff6b6b','#fbbf24','#f97316'], and strengthen cursor scatter by changing the repulsion multiplier from 0.02 to 0.05. 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

  • particle count floor 24, cap 90 and density divisor 5200
  • color palette (pal array)
  • gravity strength (g=0.16)
  • bounce damping (-0.62)
  • cursor scatter radius (dd<5000) and strength (0.02)
  • theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

  • DPR-aware canvas sizing
  • visibilitychange pause/play
  • prefers-reduced-motion single-frame guard
  • IIFE wrapper
  • 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

  • Background color hardcoded in CSS — must edit to change from dark navy
  • Reduced motion seeds visible static grains and redraws cursor scatter without an ongoing gravity loop.
  • After takeover, falling grains settle on the floor without automatic recycling.
  • State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

particlesgravityraincanvaspointerphysicsambient

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