Matrix Animated Background

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Matrix Animated Background

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HTML

CSS

JS

const canvas = document.getElementById('matrixCanvas');
const ctx = canvas.getContext('2d');

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

const katakana = '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';
const latin = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const nums = '0123456789';
const alphabet = katakana + latin + nums;

const fontSize = 16;
const columns = canvas.width / fontSize;

const rainDrops = [];

for (let x = 0; x < columns; x++) {
    rainDrops[x] = 1;
}

const draw = () => {
    ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);

ctx.fillStyle = '#0F0';
    ctx.font = fontSize + 'px monospace';

for (let i = 0; i < rainDrops.length; i++) {
        const text = alphabet.charAt(Math.floor(Math.random() * alphabet.length));
        ctx.fillText(text, i * fontSize, rainDrops[i] * fontSize);

if (rainDrops[i] * fontSize > canvas.height && Math.random() > 0.975) {
            rainDrops[i] = 0;
        }
        rainDrops[i]++;
    }
};

setInterval(draw, 50);

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