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README.MD (generated by Cursor as well 😀)

Matrix Digital Rain Effect

A lightweight and highly customizable JavaScript library for creating the iconic Matrix digital rain effect. This implementation features configurable parameters for speed, color, text, and animations, making it easily adaptable for various use cases.

Features

🎨 Customizable colors with real-time updates
⚡ Adjustable animation speed (0.5x, 1x, 2x)
📝 Configurable title overlay
🎮 Interactive controls panel
🔄 Reset functionality
📱 Responsive design
🎯 Efficient canvas rendering

Implementation Overview

1. HTML Structure

The base structure uses a canvas element with data attributes for configuration:

<canvas id="matrix"
    data-title="MATRIX"
    data-font-size="16"
    data-drop-speed="16"
    data-fade-opacity="0.05"
    data-fade-length="2"
    data-color="#0F0"
    data-frame-rate="33"
    data-reset-probability="0.975"
    data-characters="アイウエオカキクケコサシスセソタチツテトナニヌネノハヒフヘホマミムメモヤユヨラリルレロワヲン0123456789@#$%^&*()"
></canvas>

2. Matrix Rain Effect (script.matrix.js)

The core animation is handled by the MatrixRain class. Key features include:

class MatrixRain {
    constructor(canvas) {
        this.canvas = canvas;
        this.ctx = canvas.getContext('2d');
        this.initialize();
    }

    initialize() {
        // Set up canvas dimensions
        this.resize();
        // Initialize drops array
        this.drops = [];
        // Create initial drops
        this.createDrops();
        // Start animation loop
        this.animate();
    }

    createDrops() {
        const columns = Math.floor(this.canvas.width / this.fontSize);
        for (let i = 0; i < columns; i++) {
            this.drops[i] = {
                x: i * this.fontSize,
                y: Math.random() * -1000,
                speed: this.dropSpeed,
                text: this.getRandomCharacter()
            };
        }
    }

    animate() {
        // Clear canvas with fade effect
        this.ctx.fillStyle = `rgba(0, 0, 0, ${this.fadeOpacity})`;
        this.ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);

        // Draw drops
        this.ctx.fillStyle = this.color;
        this.ctx.font = `${this.fontSize}px monospace`;

        this.drops.forEach(drop => {
            // Draw character
            this.ctx.fillText(drop.text, drop.x, drop.y);

            // Update position
            drop.y += drop.speed;

            // Reset drop if it's off screen
            if (drop.y > this.canvas.height) {
                drop.y = 0;
                drop.text = this.getRandomCharacter();
            }
        });

        // Continue animation loop
        requestAnimationFrame(() => this.animate());
    }
}

3. Interactive Controls (script.js)

The control panel provides user interaction:

// Default settings
const defaultSettings = {
    color: '#0F0',
    title: 'MATRIX',
    speed: 1
};

// Speed options
const speedOptions = [
    { label: '0.5x', value: 0.5 },
    { label: '1x', value: 1 },
    { label: '2x', value: 2 }
];

// Create control elements
const controlsContainer = document.createElement('div');
controlsContainer.style.cssText = `
    position: fixed;
    top: 20px;
    left: 20px;
    display: flex;
    gap: 10px;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px;
    border: 1px solid #0F0;
`;

// Add color input
const colorInput = document.createElement('input');
colorInput.type = 'text';
colorInput.value = defaultSettings.color;
colorInput.placeholder = 'Enter color (e.g., #0F0)';

// Add speed control
const speedButton = document.createElement('button');
speedButton.textContent = '1x';
speedButton.addEventListener('click', () => {
    currentSpeedIndex = (currentSpeedIndex + 1) % speedOptions.length;
    const option = speedOptions[currentSpeedIndex];
    speedButton.textContent = option.label;
    matrixRain.setSpeed(option.value * defaultSpeed);
});

4. Title Overlay

The title overlay system adds a configurable text display:

class MatrixOverlay {
    constructor(canvas) {
        this.canvas = canvas;
        this.ctx = canvas.getContext('2d');
        this.title = canvas.getAttribute('data-title') || 'MATRIX';
        
        // Only draw title if it's not empty
        if (this.title && this.title.trim()) {
            this.drawTitle();
        }
    }

    drawTitle() {
        const centerX = this.canvas.width / 2;
        const centerY = this.canvas.height / 2;
        
        this.ctx.font = `${this.fontSize}px monospace`;
        this.ctx.fillStyle = this.color;
        this.ctx.textAlign = 'center';
        this.ctx.fillText(this.title, centerX, centerY);
    }
}

Styling

The Matrix theme is maintained through consistent styling:

body {
    margin: 0;
    overflow: hidden;
    background: black;
}

button, input {
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid #0F0;
    color: #0F0;
    padding: 5px 10px;
    font-family: monospace;
    transition: background-color 0.3s;
}

button:hover {
    background: rgba(0, 255, 0, 0.2);
}

Usage

Include the necessary files:

<script src="script.matrix.js"></script>
<script src="script.js"></script>

Add a canvas element with desired configuration:

<canvas id="matrix" data-title="MATRIX"></canvas>

Initialize the Matrix effect:

const canvas = document.getElementById('matrix');
const matrixRain = new MatrixRain(canvas);

Customization

The effect can be customized through data attributes or JavaScript:

data-title: Set the overlay title text
data-color: Change the Matrix rain color
data-drop-speed: Adjust the falling speed
data-font-size: Modify the character size
data-characters: Define custom character set

Performance Considerations

Uses requestAnimationFrame for smooth animations
Implements efficient canvas clearing with fade effect
Optimizes drop management and character updates
Responsive to window resize events

Browser Support

Works in all modern browsers that support:

Canvas API
ES6 Classes
RequestAnimationFrame