A Pen by dimas lanjaka on CodePen.
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Canvas: Run Matrix Text
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<canvas id="myCanvas" width="600" height="300"></canvas> | |
<link href="style.css" rel="stylesheet"> | |
<script src="script.js"></script> |
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window.addEventListener('load', eventWindowLoaded, false); | |
function eventWindowLoaded () { | |
canvasApp(); //包含整个Canvas应用程序 | |
} | |
function canvasSupport (e) { | |
return !!e.getContext; | |
} | |
function canvasApp () { | |
var canvas = document.getElementById('myCanvas'); | |
if (!canvasSupport(myCanvas)) { | |
return; | |
} | |
var ctx = canvas.getContext('2d'); | |
var w = canvas.width = window.innerWidth; | |
var h = canvas.height = window.innerHeight; | |
var yPositions = Array(300).join(0).split(''); | |
function runMatrix() { | |
if (typeof Game_Interval != 'undefined') clearInterval(Game_interval); | |
Game_Interval = setInterval(drawScreen, 33); | |
} | |
function drawScreen () { | |
ctx.fillStyle = 'rgba(0,0,0,.05)'; | |
ctx.fillRect(0, 0, w, h); | |
ctx.fillStyle = '#0f0'; | |
ctx.font = '10px Georgia'; | |
yPositions.map(function(y, index){ | |
text = String.fromCharCode(1e2 + Math.random() * 33); | |
x = (index * 10) + 10; | |
ctx.fillText(text, x, y); | |
if (y > 100 + Math.random() * 1e4) { | |
yPositions[index] = 0; | |
} else { | |
yPositions[index] = y + 10; | |
} | |
}) | |
} | |
runMatrix(); | |
} |
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body { | |
width: 100vw; | |
height: 100vh; | |
display: flex; | |
justify-content: center; | |
align-items: flex-start; | |
} | |
// canvas { | |
// border: 1px solid rgba(0,0,0,.14); | |
// box-shadow: 0 0 3px rgba(0,0,0,.05); | |
// margin: 20px; | |
// border-radius: 5px; | |
// } |
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