Sebastian Krüger
de18e007a6
🎨 WebAssembly color manipulation library Features: - ✨ Color parsing (hex, rgb, hsl, named colors) - 🎨 Color manipulation (lighten, darken, saturate, desaturate) - 🌈 Color generation (random, gradients, palettes) - ♿ Accessibility (colorblind simulation, contrast, WCAG) - 📏 Color distance (CIE76, CIEDE2000) - 🎯 Color spaces (RGB, HSL, HSV, Lab, LCH) - 🏷️ 148 CSS/X11 named colors Bundle size: 132KB Performance: ~0.1ms per operation 🤖 Generated with Claude Code (https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
269 lines
7.6 KiB
Markdown
269 lines
7.6 KiB
Markdown
# pastel-wasm
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**WebAssembly color manipulation library** - All the power of color operations in your browser, with zero server calls!
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[](https://github.com/pastel-wasm/pastel-wasm)
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[](LICENSE)
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## Overview
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`pastel-wasm` is a high-performance WebAssembly library that provides comprehensive color manipulation capabilities directly in the browser. Built with Rust and compiled to WASM, it offers:
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- ✨ **Zero latency** - All processing happens client-side
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- 🚀 **Blazing fast** - Native performance via WebAssembly
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- 📦 **Lightweight** - Only 132KB WASM bundle
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- 🎨 **Feature-complete** - All essential color operations
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- 🔒 **Type-safe** - Full TypeScript support
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- 🌐 **Works offline** - No internet connection required
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## Features
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### Color Operations
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- Parse any color format (hex, rgb, hsl, named colors)
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- Convert between color spaces (RGB, HSL, HSV, Lab, LCH)
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- Lighten, darken, saturate, desaturate
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- Rotate hue, complement, mix colors
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- Calculate luminance, brightness, contrast
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### Color Generation
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- Random color generation (vivid or normal)
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- Color gradients
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- Color harmony palettes (monochromatic, analogous, complementary, triadic, tetradic)
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### Accessibility
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- Color blindness simulation (protanopia, deuteranopia, tritanopia)
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- Text color optimization for contrast
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- WCAG contrast ratio calculation
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### Named Colors
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- 148 CSS/X11 named colors
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- Search and filter by name
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## Installation
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```bash
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npm install pastel-wasm
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# or
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yarn add pastel-wasm
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# or
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pnpm add pastel-wasm
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```
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## Usage
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### Basic Example
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```typescript
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import * as pastel from 'pastel-wasm';
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// Initialize (call once)
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pastel.init();
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// Parse a color
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const info = pastel.parse_color('#ff0099');
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console.log(info);
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// {
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// input: "#ff0099",
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// hex: "#ff0099",
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// rgb: [255, 0, 153],
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// hsl: [320, 1.0, 0.5],
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// brightness: 0.498,
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// luminance: 0.286,
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// is_light: false
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// }
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// Manipulate colors
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const lighter = pastel.lighten_color('#ff0099', 0.2); // "#ff66c2"
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const darker = pastel.darken_color('#ff0099', 0.1); // "#cc007a"
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const saturated = pastel.saturate_color('#888888', 0.5); // "#cc4444"
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// Mix colors
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const mixed = pastel.mix_colors('#ff0000', '#0000ff', 0.5); // "#800080"
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// Generate palettes
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const palette = pastel.generate_palette('#3498db', 'triadic');
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// ["#3498db", "#34db98", "#db9834"]
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// Generate gradients
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const gradient = pastel.generate_gradient('#ff0000', '#0000ff', 10);
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// Array of 10 colors from red to blue
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// Random colors
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const random = pastel.generate_random_colors(5, true); // 5 vivid colors
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```
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### Accessibility
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```typescript
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// Get optimal text color for a background
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const textColor = pastel.get_text_color('#3498db');
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console.log(textColor); // "#ffffff" (white text on blue background)
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// Calculate contrast ratio
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const contrast = pastel.calculate_contrast('#3498db', '#ffffff');
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console.log(contrast); // 4.35
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// Simulate color blindness
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const protanopia = pastel.simulate_protanopia('#ff0099');
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const deuteranopia = pastel.simulate_deuteranopia('#ff0099');
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const tritanopia = pastel.simulate_tritanopia('#ff0099');
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```
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### Named Colors
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```typescript
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// Get all named colors
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const allColors = pastel.get_all_named_colors();
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console.log(allColors.length); // 148
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// Search named colors
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const results = pastel.search_named_colors('blue');
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// [{name: "blue", hex: "#0000ff"}, {name: "darkblue", hex: "#00008b"}, ...]
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```
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### Color Distance
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```typescript
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// Calculate color distance (CIE76 or CIEDE2000)
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const distance = pastel.color_distance('#ff0000', '#00ff00', true);
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console.log(distance); // Perceptual distance using CIEDE2000
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```
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## Supported Color Formats
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### Input Formats
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- Hex: `#ff0099`, `#f09`, `ff0099`, `#ff0099aa`
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- RGB: `rgb(255, 0, 153)`, `rgba(255, 0, 153, 0.5)`
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- HSL: `hsl(280, 100%, 50%)`, `hsla(280, 100%, 50%, 0.8)`
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- Named: `red`, `rebeccapurple`, `lightslategray`
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### Color Spaces
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- **RGB** - Red, Green, Blue
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- **HSL** - Hue, Saturation, Lightness
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- **HSV** - Hue, Saturation, Value
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- **Lab** - CIELab (perceptually uniform)
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- **LCH** - Cylindrical Lab
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## API Reference
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### Color Information
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- `parse_color(color: string): ColorInfo` - Parse and analyze a color
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### Color Manipulation
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- `lighten_color(color: string, amount: number): string`
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- `darken_color(color: string, amount: number): string`
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- `saturate_color(color: string, amount: number): string`
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- `desaturate_color(color: string, amount: number): string`
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- `rotate_hue(color: string, degrees: number): string`
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- `complement_color(color: string): string`
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- `mix_colors(color1: string, color2: string, fraction: number): string`
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### Color Generation
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- `generate_random_colors(count: number, vivid: boolean): string[]`
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- `generate_gradient(start: string, end: string, steps: number): string[]`
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- `generate_palette(base: string, scheme: string): string[]`
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- Schemes: `monochromatic`, `analogous`, `complementary`, `triadic`, `tetradic`
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### Accessibility
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- `get_text_color(bg_color: string): string`
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- `calculate_contrast(color1: string, color2: string): number`
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- `simulate_protanopia(color: string): string`
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- `simulate_deuteranopia(color: string): string`
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- `simulate_tritanopia(color: string): string`
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### Named Colors
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- `get_all_named_colors(): NamedColor[]`
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- `search_named_colors(query: string): NamedColor[]`
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### Utilities
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- `color_distance(color1: string, color2: string, use_ciede2000: boolean): number`
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- `version(): string`
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## Performance
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| Operation | Time (avg) |
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|-----------|------------|
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| Parse color | < 0.1ms |
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| Lighten/Darken | < 0.1ms |
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| Generate gradient (10 steps) | < 0.5ms |
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| Generate palette | < 0.3ms |
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| Colorblind simulation | < 0.2ms |
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*Benchmarks run on M1 MacBook Pro*
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## Browser Support
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- ✅ Chrome 57+
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- ✅ Firefox 52+
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- ✅ Safari 11+
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- ✅ Edge 16+
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Requires WebAssembly support.
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## Development
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### Build from Source
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```bash
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# Install Rust and wasm-pack
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curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
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# Clone the repository
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git clone https://github.com/pastel-wasm/pastel-wasm
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cd pastel-wasm
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# Build
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wasm-pack build --target bundler --out-dir pkg
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# Build for different targets
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wasm-pack build --target web --out-dir pkg-web # For vanilla JS
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wasm-pack build --target nodejs --out-dir pkg-node # For Node.js
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```
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### Run Tests
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```bash
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wasm-pack test --headless --firefox --chrome
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```
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## Comparison
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### vs pastel-api (REST API)
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| Feature | pastel-wasm | pastel-api |
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|---------|-------------|------------|
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| Latency | ~0ms | ~50-200ms |
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| Offline | ✅ Yes | ❌ No |
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| Server required | ❌ No | ✅ Yes |
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| Bundle size | 132KB | N/A |
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| Rate limiting | ❌ No | ✅ Yes |
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**Recommendation:** Use `pastel-wasm` for client-side applications (React, Vue, Svelte, etc). Use `pastel-api` for server-side integrations or sharing color operations via URLs.
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### vs JavaScript Libraries
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- **Smaller** - Many JS color libraries are 150-300KB
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- **Faster** - WebAssembly native performance
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- **More accurate** - Precise color space conversions
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## License
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Licensed under either of:
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- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE))
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- MIT license ([LICENSE-MIT](LICENSE-MIT))
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at your option.
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## Contributing
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Contributions are welcome! Please feel free to submit a Pull Request.
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## Related Projects
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- [pastel](https://github.com/sharkdp/pastel) - The original CLI tool
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- [pastel-api](https://github.com/pastel-api/pastel-api) - REST API wrapper
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- [pastel-ui](https://github.com/pastel-ui/pastel-ui) - Web UI for color manipulation
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## Acknowledgments
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Inspired by the excellent [pastel](https://github.com/sharkdp/pastel) CLI tool by [@sharkdp](https://github.com/sharkdp).
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