Cosmic & Space
Comet Streak Loop
Cyan and violet comets with glowing heads and gradient tails streak diagonally across a twinkling dark starfield; click spawns an extra comet (up to 5).
canvasmedium complexitymoderate motionclick
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Worth keeping?
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When to use it
Dark-mode hero backgrounds, space/sci-fi themes, ambient looping screensavers, loading screens.
When not to
Light-background UIs (background hardcoded #030a14). Content-heavy layouts where diagonal motion competes with reading.
Working with an AI agent
Every component ships agent-ready metadata. An example instruction for this one:
Change comet colors to warm gold and orange by replacing the hue array values '#7fe8ff' and '#c9b6ff' with '#ffe066' and '#ff9a3c', and increase comet speed by raising sp from 0.0045 to 0.008.
Safe to edit
- comet color palette (hue values '#7fe8ff'/'#c9b6ff')
- comet speed range (sp: 0.0045 + random*0.004)
- tail length (len: 0.20 + random*0.13)
- max comet count cap (comets.length < 5)
- travel direction vector (dx=-0.78, dy=0.62)
- star count and twinkle speed (60 stars, t*0.02)
Keep intact
- DPR-aware canvas sizing (cv.width = W*DPR)
- visibilitychange pause/resume
- reduced-motion guard (single static frame)
- IIFE wrapper
Known limitations
- Background color hardcoded in CSS (#030a14) — must edit to change dark navy
- Reduced-motion mode renders one static frame only — comets are frozen, not removed
- Click spawns comets but they auto-respawn on exit anyway, making click feel optional
More Cosmic & Space components
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- Black-hole Accretion Swirl110 heat-colored particles spiral inward across a tilted accretion disk toward a glowing event horizon; pointer movement boosts swirl speed.
- Twinkling Starfield115 multicolor stars twinkle via sine waves; sparkle crosses appear on larger stars; stars brighten near cursor. Static fallback for reduced-motion.
- Spiral Galaxy Rotate115 stars form a two-armed spiral galaxy rotating around a violet radial-gradient core; pointer move briefly doubles spin speed.
- Ringed Planet RotateAmber gas giant with tilted Saturn-like rings slowly rotates over a twinkling starfield; pointermove adjusts ring tilt and light angle dynamically.
- Constellation Connect46 drifting star nodes auto-connect with faint magenta lines when close; cursor draws lines to nearby stars and brightens them on hover.