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index.html
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index.html
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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>Matrix</title>
<style>
html {
background-color: #000;
overflow: hidden;
}
body {
margin: 0;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script>
const FONT_SIZE = 20;
const FADE_FACTOR = 0.95;
const MIN_OPACITY = 0.1;
const FALL_SPEED = 2;
const DROP_END_PROB = 0.9;
const DROP_PER_COL = 2;
/** @type {HTMLCanvasElement} */
const canvas = document.getElementById("canvas");
const dpr = window.devicePixelRatio || 1;
canvas.width = window.innerWidth * dpr;
canvas.height = window.innerHeight * dpr;
canvas.style.width = window.innerWidth + "px";
canvas.style.height = window.innerHeight + "px";
const ctx = canvas.getContext("2d");
ctx.scale(dpr, dpr);
const colCount = Math.floor(window.innerWidth / FONT_SIZE);
const rowCount = Math.floor(window.innerHeight / FONT_SIZE);
ctx.font = `${FONT_SIZE}px monospace`;
ctx.shadowBlur = 3;
const chars = "銇併亗銇冦亜銇呫亞銇囥亪銇夈亰銇嬨亴銇嶃亷銇忋亹銇戙亽銇撱仈銇曘仏銇椼仒銇欍仛銇涖仠銇濄仦銇熴仩銇°仮銇ｃ仱銇ャ仸銇с仺銇┿仾銇伂銇伄銇伆銇便伈銇炽伌銇点伓銇枫伕銇广伜銇汇伡銇姐伨銇裤個銈併倐銈冦倓銈呫倖銈囥倛銈夈倞銈嬨倢銈嶃値銈忋倫銈戙倰銈撱倲".split(
""
);
const randomChar = () => {
const index = Math.floor(Math.random() * chars.length);
return chars[index];
};
const grid = Array.from(Array(rowCount)).map((_) =>
Array.from(Array(colCount)).map((_) => ({
char: randomChar(),
opacity: MIN_OPACITY,
}))
);
const initDroplet = (col, row) => {
const interval =
Math.floor(Math.floor(Math.random() * 500) + 200) / FALL_SPEED;
col = col ?? Math.floor(Math.random() * colCount);
row = row ?? Math.floor(Math.random() * rowCount);
const update = () => {
row++;
// Only
if (row >= 0 && row < rowCount) {
grid[row][col] = {
char: randomChar(),
opacity: 1,
};
}
// End droplet based on probability
const canContinue = Math.random() < DROP_END_PROB;
// Schedule next update for this droplet
// Or initialise a new droplet for this column
if (row < rowCount && canContinue) {
setTimeout(update, interval);
} else {
initDroplet(col);
}
};
setTimeout(update, interval);
};
for (let col = 0; col < colCount; col++) {
Array.from(Array(DROP_PER_COL)).forEach((_) => initDroplet(col));
}
let lastFrame = Date.now();
function draw() {
const delta = (Date.now() - lastFrame) / 1000;
lastFrame = Date.now();
// Apply black background
ctx.fillStyle = "#000";
ctx.fillRect(0, 0, canvas.width, canvas.height);
grid.forEach((cells, row) => {
cells.forEach((cell, col) => {
const x = col * FONT_SIZE;
const y = row * FONT_SIZE;
const h = cell.opacity * 50 + 0;
const s = 100;
const l = (row * 50) / rowCount + cell.opacity * 40;
const a = Math.max(MIN_OPACITY, cell.opacity);
const color = `hsla(${h}, ${s}%, ${l}%, ${a})`;
ctx.fillStyle = color;
ctx.shadowColor = color;
ctx.fillText(cell.char, x, y);
// Slowly fade each cell over time
const opacity =
cell.opacity * Math.pow(Math.E, -delta * FADE_FACTOR);
grid[row][col] = {
...cell,
opacity,
};
});
});
requestAnimationFrame(draw);
}
requestAnimationFrame(draw);
</script>
</body>
</html>