A Pen by Pavitra Golchha on CodePen.
Created
November 20, 2022 13:30
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1337 Matrix
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<canvas id="canvas"> |
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import * as datGui from "https://cdn.skypack.dev/dat.gui@0.7.7"; | |
const state = { | |
fps: 60, | |
color: "#0f0", | |
charset: "0123456789ABCDEF" | |
}; | |
const gui = new datGui.GUI(); | |
const fpsCtrl = gui.add(state, "fps").min(1).max(120).step(1); | |
gui.addColor(state, "color"); | |
gui.add(state, "charset"); | |
const canvas = document.getElementById("canvas"); | |
const ctx = canvas.getContext("2d"); | |
let w, h, p; | |
const resize = () => { | |
w = canvas.width = innerWidth; | |
h = canvas.height = innerHeight; | |
p = Array(Math.ceil(w / 10)).fill(0); | |
}; | |
window.addEventListener("resize", resize); | |
resize(); | |
const random = (items) => items[Math.floor(Math.random() * items.length)]; | |
const draw = () => { | |
ctx.fillStyle = "rgba(0,0,0,.05)"; | |
ctx.fillRect(0, 0, w, h); | |
ctx.fillStyle = state.color; | |
for (let i = 0; i < p.length; i++) { | |
let v = p[i]; | |
ctx.fillText(random(state.charset), i * 10, v); | |
p[i] = v >= h || v >= 10000 * Math.random() ? 0 : v + 10; | |
} | |
}; | |
let interval = setInterval(draw, 1000 / state.fps); | |
fpsCtrl.onFinishChange((fps) => { | |
console.log(fps); | |
if (interval) { | |
clearInterval(interval); | |
} | |
interval = setInterval(draw, 1000 / fps); | |
}); |
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body { | |
margin: 0; | |
overflow: hidden; | |
} |
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