黑客帝国文字下落效果

yaozheng   发布于 2018年05月28日   阅读次数: 525   

<!DOCTYPE html>
<html>
<head>
<title>黑客帝国效果</title>
<style type="text/css">
body{margin: 0; padding: 0; overflow: hidden;}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<script type="text/javascript">
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
canvas.height = window.innerHeight;
canvas.width = window.innerWidth;
var texts = '0123456789'.split('');

var fontSize = 16;
var columns = canvas.width/fontSize;
var drops = [];
for(var x = 0; x < columns; x++){
    drops[x] = 1;
}

function draw(){
    ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    ctx.fillStyle = '#0F0';
    ctx.font = fontSize + 'px arial';
    for(var i = 0; i < drops.length; i++){
	var text = texts[Math.floor(Math.random()*texts.length)];
	ctx.fillText(text, i*fontSize, drops[i]*fontSize);

	if(drops[i]*fontSize > canvas.height || Math.random() > 0.95){
	    drops[i] = 0;
	}

	drops[i]++;
    }
}

setInterval(draw, 33);
</script>
</body>