Particles & Physics

Pointer Trail

Rainbow spark particles arc off the cursor position, fading with a glow trail on near-black. Initial Lissajous demo stops after first input; manual movement emits sparks that fade without stationary emission.

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 →

When to use it

Dark-background hero sections, creative portfolio landing pages, or ambient interactive demos where cursor magic adds delight.

When not to

Light backgrounds (hardcoded dark fill), content-dense layouts where cursor trails distract from reading, or reduced-motion contexts needing full animation.

Working with an AI agent

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

Change particle cap from 110 to 60, slow hue cycling by setting t*40 to t*20, and increase gravity from 0.02 to 0.06 so sparks arc downward faster. 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 cap (parts.length<110)
hue cycle speed (t*40)
gravity strength (p.vy+=0.02)
particle size range (1.5+Math.random()*2.5)
trail fade opacity (rgba 0.18)
auto-orbit radius (W*0.32, H*0.32)
theme tokens (:root dark defaults + [data-theme=light] overrides)

Keep intact

visibilitychange pause/resume
DPR-aware canvas sizing
auto-orbit fallback when pointer absent
reduced-motion guard (single-frame only)
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

Reduced-motion guard only draws one static frame — not a true static fallback (no meaningful still state)
Background color hardcoded in CSS and JS fill — two places to change
Particle cap of 110 may still tax very low-end mobile CPUs
State remains local to each mounted instance; format/theme remount preserves takeover, not component values.

particlestrailpointerrainbowcanvasgenerativeambient

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