snippets/javascript/digital_rain/digital_rain.html at main · RyanRustill/snippets · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Digital Rain Animation</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: #000;
            overflow: hidden;
            font-family: 'Courier New', monospace;
        }

        canvas {
            display: block;
            background: #000;
        }


    </style>
</head>
<body>
    <canvas id="canvas"></canvas>

    <script>
        const canvas = document.getElementById('canvas');
        const ctx = canvas.getContext('2d');

        // Set canvas to full screen
        canvas.width = window.innerWidth;
        canvas.height = window.innerHeight;

        // Characters for the rain effect
        const 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0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
        const charArray = characters.split('');

        // Column settings
        const fontSize = 14;
        const columns = canvas.width / fontSize;

        // Array to store the y position of each drop
        const drops = [];

        // Initialize drops
        for (let i = 0; i < columns; i++) {
            drops[i] = Math.random() * canvas.height;
        }

        // Animation function
        function draw() {
            // Create trailing effect by drawing semi-transparent black rectangle
            ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
            ctx.fillRect(0, 0, canvas.width, canvas.height);

            // Set text style
            ctx.fillStyle = '#00ff00';
            ctx.font = fontSize + 'px Courier New';

            // Draw characters
            for (let i = 0; i < drops.length; i++) {
                // Random character
                const char = charArray[Math.floor(Math.random() * charArray.length)];

                // Draw character
                ctx.fillText(char, i * fontSize, drops[i]);

                // Move drop down
                drops[i] += fontSize;

                // Reset drop to top with some randomness
                if (drops[i] > canvas.height && Math.random() > 0.975) {
                    drops[i] = 0;
                }
            }
        }

        // Handle window resize
        window.addEventListener('resize', () => {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;

            // Recalculate columns
            const newColumns = canvas.width / fontSize;

            // Adjust drops array
            drops.length = newColumns;
            for (let i = 0; i < newColumns; i++) {
                if (drops[i] === undefined) {
                    drops[i] = Math.random() * canvas.height;
                }
            }
        });

        // Start animation
        setInterval(draw, 50);

        // Add some interactivity - click to create burst
        canvas.addEventListener('click', (e) => {
            const rect = canvas.getBoundingClientRect();
            const x = e.clientX - rect.left;
            const y = e.clientY - rect.top;

            // Create a burst effect at click location
            const columnIndex = Math.floor(x / fontSize);
            if (columnIndex >= 0 && columnIndex < drops.length) {
                drops[columnIndex] = y;

                // Affect nearby columns
                for (let i = -3; i <= 3; i++) {
                    const nearbyColumn = columnIndex + i;
                    if (nearbyColumn >= 0 && nearbyColumn < drops.length) {
                        drops[nearbyColumn] = y + (Math.random() - 0.5) * 50;
                    }
                }
            }
        });

        // Easter egg: Press 'N' for Neo mode (faster, more intense)
        let neoMode = false;
        document.addEventListener('keydown', (e) => {
            if (e.key.toLowerCase() === 'n') {
                neoMode = !neoMode;
                if (neoMode) {
                    document.body.style.background = '#001100';
                    console.log('Neo mode activated! "There is no spoon..."');
                } else {
                    document.body.style.background = '#000';
                    console.log('Neo mode deactivated.');
                }
            }
        });
    </script>
</body>
</html>