🌌 CosmicCanvas (my-constellation-bg)

The ultimate animated space background library. Create stunning starfields, nebulas, auroras & shooting stars with one line of code. Features 6 built-in themes, click interactions, touch support & zero dependencies!

✨ Features

🌟 Realistic Star Distribution - 800+ stars with natural brightness distribution and subtle twinkling
🎨 6 Built-in Themes - midnight, aurora, nebula, cosmic, deep-space, warm-galaxy
✨ Aurora Borealis Effect - Stunning northern lights animation with customizable colors
💫 Interactive Meteors - Click/tap to spawn shooting stars with varying speeds and colors
🌌 Nebula Clouds - Atmospheric depth with drifting colorful clouds
🔄 Parallax Effect - Mouse movement creates 3D depth illusion
📱 Touch Support - Full mobile and tablet interaction support
⚡ High Performance - Optimized rendering with configurable performance modes
🎯 Star Clusters - Realistic constellation patterns and grouped formations
💫 Bright Star Glow - Special radial glow effects on the brightest stars
⏸️ Pause/Resume - Full animation playback control
📱 Responsive - Automatically adapts to canvas/window size
⚡ Lightweight - Pure vanilla JavaScript, zero dependencies
🎯 Easy Integration - Simple API, works with any framework
🔧 Backward Compatible - Exports CosmicCanvas, RealisticStarfield, and ConstellationBackground

🆕 What's New in v2.1.1

🚀 Major Rewrite - CosmicCanvas Engine

New Class Name - Now CosmicCanvas (with RealisticStarfield alias for compatibility)
6 Built-in Themes - Pre-configured themes: midnight, aurora, nebula, cosmic, deep-space, warm-galaxy
Aurora Borealis - Stunning northern lights effect with wave animations
Interactive Meteors - Click/tap anywhere to spawn shooting stars
Touch Support - Full mobile and tablet support with touch events
Star Clusters - Realistic constellation groupings and formations
Performance Modes - Configurable performance levels for different devices
Enhanced API - More intuitive configuration and control methods

🎨 Built-in Themes

// Use any built-in theme
const canvas = new CosmicCanvas({
  theme: 'aurora' // midnight, aurora, nebula, cosmic, deep-space, warm-galaxy
});

✨ New Interactive Features

Click-to-Spawn - Click anywhere to create meteors
Touch Events - Tap on mobile devices
Aurora Animation - Flowing northern lights effect
Star Clustering - Realistic constellation patterns

Key Options in v2.1.1

Option	Type	Default	Description
`theme`	string	`'midnight'`	Built-in theme: midnight, aurora, nebula, cosmic, deep-space, warm-galaxy
`enableInteraction`	boolean	`true`	Enable click/touch to spawn meteors
`enableAurora`	boolean	`false`	Enable aurora borealis effect (auto-enabled in aurora theme)
`enableClusters`	boolean	`true`	Enable star cluster formations
`performanceMode`	string	`'auto'`	Performance level: 'low', 'medium', 'high', 'auto'
`touchSupport`	boolean	`true`	Enable mobile touch events
`enableParallax`	boolean	`true`	Enable parallax effect on mouse movement
`enableNebula`	boolean	varies	Enable nebula clouds (theme-dependent)
`starCount`	number	varies	Number of stars to render (theme-dependent)

Methods in v2.1.1

// Create with theme
const canvas = new CosmicCanvas({ theme: 'aurora' });

// Control animation
canvas.pause();
canvas.resume();
canvas.togglePause();

// Check state
if (canvas.paused) {
  console.log('Animation is paused');
}

// Get version
console.log(CosmicCanvas.VERSION); // "2.0.0"
console.log(RealisticStarfield.version); // "2.0.0" (alias)

📦 Installation

npm install my-constellation-bg

🔧 Build & Test

# Build the package
npm run build

# Test the package (verify it works)
npm test

🚀 Usage Guide

Method 1: Vanilla HTML/JavaScript (Easiest)

Option A: Using Built File

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Starfield Background</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            overflow: hidden;
        }

        #starfield-canvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            z-index: -1;
        }

        .content {
            position: relative;
            z-index: 1;
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            height: 100vh;
            flex-direction: column;
        }

        h1 {
            font-size: 4rem;
            margin-bottom: 1rem;
        }
    </style>
</head>
<body>
    <canvas id="starfield-canvas"></canvas>

    <div class="content">
        <h1>Welcome to My Site</h1>
        <p>Beautiful starfield background ✨</p>
    </div>

    <script src="dist/index.js"></script>
    
    <script>
        const canvas = document.getElementById('starfield-canvas');
        
        // Create starfield with theme (recommended)
        const starfield = new CosmicCanvas(canvas, { theme: 'aurora' });

        // OR with custom options:
        // const starfield = new CosmicCanvas(canvas, {
        //     starCount: 1000,              // More stars
        //     backgroundColor: '#0a0a0a',   // Custom background
        //     enableAurora: true,           // Enable aurora effect
        //     enableInteraction: true,      // Click to spawn meteors
        //     performanceMode: 'high',      // Performance level
        //     touchSupport: true,           // Mobile support
        //     parallaxStrength: 0.03,       // Parallax intensity
        //     enableNebula: true,           // Enable nebula clouds
        //     nebulaOpacity: 0.2,           // Nebula visibility
        //     enablePulsate: true           // Pulsating bright stars
        // });

        // Trigger a meteor manually (e.g., on button click)
        // starfield.triggerMeteor();

        // Update options dynamically
        // starfield.setOptions({ meteorInterval: 3000 });

        // Pause/resume controls
        // starfield.pause();
        // starfield.resume();
        // starfield.togglePause();
    </script>
</body>
</html>

Option B: ES6 Module Import

<!DOCTYPE html>
<html lang="en">
<head>
    <!-- Same styles as above -->
</head>
<body>
    <canvas id="starfield-canvas"></canvas>
    <div class="content">
        <h1>Welcome</h1>
    </div>

    <script type="module">
        import RealisticStarfield from './src/index.js';
        // OR for backward compatibility:
        // import { ConstellationBackground } from './src/index.js';
        
        const canvas = document.getElementById('starfield-canvas');
        const starfield = new CosmicCanvas(canvas, { theme: 'aurora' });
    </script>
</body>
</html>

Method 2: React

Basic Implementation

import React, { useEffect, useRef } from 'react';
import CosmicCanvas from 'my-constellation-bg';

function App() {
  const canvasRef = useRef(null);
  const starfieldRef = useRef(null);

  useEffect(() => {
    if (canvasRef.current) {
      starfieldRef.current = new CosmicCanvas(canvasRef.current, {
        theme: 'cosmic',
        enableInteraction: true
      });
    }

    return () => {
      if (starfieldRef.current) {
        starfieldRef.current.destroy();
      }
    };
  }, []);

  return (
    <div style={{ position: 'relative', width: '100vw', height: '100vh' }}>
      <canvas
        ref={canvasRef}
        style={{
          position: 'fixed',
          top: 0,
          left: 0,
          width: '100%',
          height: '100%',
          zIndex: -1
        }}
      />
      
      <div style={{
        position: 'relative',
        zIndex: 1,
        color: 'white',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
        height: '100vh',
        flexDirection: 'column'
      }}>
        <h1>Welcome to My App</h1>
        <p>Built with React ⚛️</p>
      </div>
    </div>
  );
}

export default App;

Reusable Component

// StarfieldCanvas.jsx
import React, { useEffect, useRef } from 'react';
import RealisticStarfield from 'my-constellation-bg';

const StarfieldCanvas = ({ options = {} }) => {
  const canvasRef = useRef(null);
  const starfieldRef = useRef(null);

  useEffect(() => {
    if (canvasRef.current && !starfieldRef.current) {
      starfieldRef.current = new RealisticStarfield(
        canvasRef.current,
        options
      );
    }

    return () => {
      if (starfieldRef.current) {
        starfieldRef.current.destroy();
        starfieldRef.current = null;
      }
    };
  }, [options]);

  return (
    <canvas
      ref={canvasRef}
      style={{
        position: 'fixed',
        top: 0,
        left: 0,
        width: '100%',
        height: '100%',
        zIndex: -1
      }}
    />
  );
};

export default StarfieldCanvas;

Usage:

import StarfieldCanvas from './StarfieldCanvas';

function App() {
  return (
    <>
      <StarfieldCanvas 
        options={{
          starCount: 1000,
          meteorInterval: 5000
        }}
      />
      <div className="content">
        <h1>Your Content Here</h1>
      </div>
    </>
  );
}

Method 3: Vue 3

Composition API

<template>
  <div class="container">
    <canvas ref="canvasRef" class="starfield-canvas"></canvas>
    <div class="content">
      <h1>Welcome to Vue App</h1>
      <p>Powered by Vue 3 🟢</p>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted, onBeforeUnmount } from 'vue';
import RealisticStarfield from 'my-constellation-bg';

const canvasRef = ref(null);
let starfield = null;

onMounted(() => {
  if (canvasRef.value) {
    starfield = new RealisticStarfield(canvasRef.value, {
      starCount: 800,
      meteorInterval: 8000
    });
  }
});

onBeforeUnmount(() => {
  if (starfield) {
    starfield.destroy();
  }
});
</script>

<style scoped>
.container {
  position: relative;
  width: 100vw;
  height: 100vh;
}

.starfield-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.content {
  position: relative;
  z-index: 1;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  flex-direction: column;
}

h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
}
</style>

Options API

<template>
  <div class="container">
    <canvas ref="canvas" class="starfield-canvas"></canvas>
    <div class="content">
      <h1>Your Content</h1>
    </div>
  </div>
</template>

<script>
import RealisticStarfield from 'my-constellation-bg';

export default {
  data() {
    return {
      starfield: null
    };
  },
  mounted() {
    this.starfield = new RealisticStarfield(this.$refs.canvas, {
      starCount: 800,
      meteorInterval: 8000
    });
  },
  beforeUnmount() {
    if (this.starfield) {
      this.starfield.destroy();
    }
  }
};
</script>

<style scoped>
.container {
  position: relative;
  width: 100vw;
  height: 100vh;
}

.starfield-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

.content {
  position: relative;
  z-index: 1;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  flex-direction: column;
}
</style>

⚙️ Configuration Options

Customize the appearance and behavior:

const starfield = new RealisticStarfield(canvas, {
  starCount: 800,                 // Number of stars (scales with screen size)
  backgroundColor: '#000000',     // Pure black deep space
  meteorInterval: 8000,           // Time between meteors (ms)
  meteorAngle: 35,                // Meteor angle in degrees
  enableMeteors: true,            // Enable/disable shooting stars
  enableTwinkle: true,            // Enable/disable star twinkling
  twinkleIntensity: 0.3           // Twinkle strength (0-1)
});

Options Reference

Option	Type	Default	Description
`starCount`	Number	`800`	Base number of stars (auto-scales with screen size)
`backgroundColor`	String	`'#000000'`	Canvas background color (pure black recommended)
`meteorInterval`	Number	`8000`	Time between meteor spawns (milliseconds)
`meteorAngle`	Number	`35`	Fixed angle for meteors in degrees (from vertical)
`enableMeteors`	Boolean	`true`	Enable or disable shooting stars
`enableTwinkle`	Boolean	`true`	Enable or disable star twinkling effect
`twinkleIntensity`	Number	`0.3`	How much stars twinkle (0 = none, 1 = maximum)

Meteor Speed Distribution

Meteors spawn with varying speeds for a realistic effect:

40% Slow Meteors - Graceful, long trails (speed: 2-3.5)
40% Medium Meteors - Balanced appearance (speed: 4-6)
20% Fast Meteors - Quick bright streaks (speed: 8-12)

Star Brightness Distribution

Stars are distributed with realistic brightness levels:

70% Dim Stars - Tiny, faint (like distant stars)
20% Medium Stars - Moderate brightness
7% Bright Stars - Clearly visible
3% Very Bright Stars - With glow effect

🎨 Styling Examples

Default Realistic Night Sky

// Just use defaults - they look like a real photo!
new RealisticStarfield(canvas);

Dense Starfield

new RealisticStarfield(canvas, {
  starCount: 1500,        // More stars
  meteorInterval: 5000    // More frequent meteors
});

Subtle Background (Less Distracting)

new RealisticStarfield(canvas, {
  starCount: 400,         // Fewer stars
  meteorInterval: 15000,  // Rare meteors
  twinkleIntensity: 0.2   // Very subtle twinkle
});

No Meteors (Static Starfield)

new RealisticStarfield(canvas, {
  enableMeteors: false,   // Disable shooting stars
  enableTwinkle: true     // Keep twinkling
});

🎯 Common Use Cases

Hero Section Background

<style>
    .hero {
        position: relative;
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    #hero-canvas {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
    }
</style>

<section class="hero">
    <canvas id="hero-canvas"></canvas>
    <div class="hero-content">
        <h1>Your Hero Title</h1>
        <p>Subtitle goes here</p>
    </div>
</section>

<script src="dist/index.js"></script>
<script>
    const canvas = document.getElementById('hero-canvas');
    new RealisticStarfield(canvas);
</script>

Full Page Background (with scrollable content)

<style>
    body {
        margin: 0;
        background: #000;
    }
    
    #bg-canvas {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
    }
    
    main {
        position: relative;
        z-index: 1;
        min-height: 100vh;
        color: white;
        padding: 2rem;
    }
</style>

<canvas id="bg-canvas"></canvas>
<main>
    <h1>Page Title</h1>
    <p>Your content scrolls normally while background stays fixed</p>
    <!-- More content... -->
</main>

<script src="dist/index.js"></script>
<script>
    const canvas = document.getElementById('bg-canvas');
    new RealisticStarfield(canvas);
</script>

🛠️ API Reference

Constructor

new RealisticStarfield(canvas, options)
// OR for backward compatibility:
new ConstellationBackground(canvas, options)

Creates a new starfield instance.

Parameters:

canvas (HTMLCanvasElement) - The canvas element to render on
options (Object, optional) - Configuration object

Returns: RealisticStarfield instance

Methods

`destroy()`

Stops the animation and cleans up event listeners. Always call this when removing the canvas (especially in SPAs).

starfield.destroy();

`setOptions(options)`

Update options dynamically without recreating the instance.

starfield.setOptions({ meteorInterval: 5000 });

`triggerMeteor()`

Manually trigger a shooting star (e.g., on button click or event).

starfield.triggerMeteor();

`resize()`

Manually trigger a resize. Usually called automatically on window resize.

starfield.resize();

📁 File Structure

my-constellation-bg/
├── dist/
│   └── index.js          # Built file (after npm run build)
├── src/
│   └── index.js          # Source file (RealisticStarfield class)
├── test.js               # Test suite
├── index.html            # Demo page
├── package.json
└── README.md

💡 Best Practices

Z-index: Always set canvas z-index: -1 to keep it behind content
Fixed positioning: Use position: fixed for full-page backgrounds
Performance: Lower starCount for better mobile performance (try 100-150)
Cleanup: Always call destroy() when unmounting (React/Vue components)
Responsive: Canvas automatically resizes, no additional code needed
Build first: Run npm run build before using in production

🌐 Browser Support

Works in all modern browsers that support:

Canvas API
ES6 Classes
RequestAnimationFrame

Tested on: Chrome, Firefox, Safari, Edge

🎯 Real-World Examples

Landing page hero sections
Login/signup page backgrounds
Portfolio websites
Dashboard backgrounds
Loading screens
Presentation slides
Marketing pages

� Changelog

v2.1.1 (2026-02-01)

Major Rewrite - CosmicCanvas Engine

🚀 Complete Rewrite: New CosmicCanvas class with enhanced architecture
🎨 6 Built-in Themes: midnight, aurora, nebula, cosmic, deep-space, warm-galaxy
✨ Aurora Borealis: Stunning northern lights animation with wave effects
💫 Interactive Meteors: Click/tap anywhere to spawn shooting stars
📱 Touch Support: Full mobile and tablet interaction support
🌟 Star Clusters: Realistic constellation patterns and groupings
⚡ Performance Modes: Configurable performance levels (low/medium/high/auto)
🔄 Enhanced Parallax: Improved mouse movement depth effects
🔧 Backward Compatibility: Maintains RealisticStarfield and ConstellationBackground exports
📝 TypeScript Support: Full type definitions included
🏠 Better API: More intuitive configuration and control methods

v1.4.0 (Previous)

Parallax & Nebula Update

🔄 Parallax Effect: Mouse movement creates 3D depth illusion
🌌 Nebula Clouds: Optional atmospheric nebula clouds
💫 Pulsating Stars: Bright stars gently pulse for realism
⏸️ Pause/Resume: Animation playback control methods
📊 Performance: Smoother rendering and interpolation

v1.2.0 (2026-01-02)

Major Update - Grok-style Improvements

✨ Fixed Position Stars: Stars now have anchor positions with subtle drift movement
☄️ Variable Speed Meteors: Added slow (30%), medium (50%), and fast (20%) meteor types
💫 Bright Star Glow: 15% of stars now feature a special radial glow effect
🎨 Enhanced Meteor Colors: Different meteor speeds have unique color schemes
⚙️ New Options: Added starDrift and driftSpeed configuration options
🐛 Performance: Optimized animation loop for smoother rendering

v1.1.3

Bug fixes and stability improvements

v1.1.0

Initial public release with blinking stars, connections, and meteors

�📄 License

🤝 Contributing

Contributions, issues, and feature requests are welcome!

Feel free to check (https://github.com/anupamraj176/my-constellation-bg).

💖 Support

If you like this project, please give it a ⭐ on GitHub!

Made with ☄️ by Anupam Raj

Name		Name	Last commit message	Last commit date
Latest commit History 24 Commits
dist		dist
node_modules		node_modules
src		src
README.md		README.md
build.js		build.js
index.html		index.html
package-lock.json		package-lock.json
package.json		package.json
test.js		test.js

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🌌 CosmicCanvas (my-constellation-bg)

✨ Features

🆕 What's New in v2.1.1

🚀 Major Rewrite - CosmicCanvas Engine

🎨 Built-in Themes

✨ New Interactive Features

Key Options in v2.1.1

Methods in v2.1.1

📦 Installation

🔧 Build & Test

🚀 Usage Guide

Method 1: Vanilla HTML/JavaScript (Easiest)

Option A: Using Built File

Option B: ES6 Module Import

Method 2: React

Basic Implementation

Reusable Component

Method 3: Vue 3

Composition API

Options API

⚙️ Configuration Options

Options Reference

Meteor Speed Distribution

Star Brightness Distribution

🎨 Styling Examples

Default Realistic Night Sky

Dense Starfield

Subtle Background (Less Distracting)

No Meteors (Static Starfield)

🎯 Common Use Cases

Hero Section Background

Full Page Background (with scrollable content)

🛠️ API Reference

Constructor

Methods

destroy()

setOptions(options)

triggerMeteor()

resize()

📁 File Structure

💡 Best Practices

🌐 Browser Support

🎯 Real-World Examples

� Changelog

v2.1.1 (2026-02-01)

v1.4.0 (Previous)

v1.2.0 (2026-01-02)

v1.1.3

v1.1.0

�📄 License

🤝 Contributing

💖 Support

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`destroy()`

`setOptions(options)`

`triggerMeteor()`

`resize()`

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