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Html5-黑客帝国【矩阵革命】 文字雨效果代码演示

Posted on 2017-06-25 01:04  Young哥哥  阅读(748)  评论(0)    收藏  举报

<!DOCTYPE HTML>
<head>
<meta charset="utf-8" />
<title>HTML5 canvas和javascript矩阵雨动画效果</title>
<style type="text/css">
/*basic reset*/
* {margin: 0; padding: 0;}
/*adding a black bg to the body to make things clearer*/
body {background: black;}
canvas {display: block;}
</style>
</head>
<body>
<canvas id="c"></canvas>
<script type="text/javascript">
var c = document.getElementById("c");
var ctx = c.getContext("2d");

c.height = window.innerHeight;
c.width = window.innerWidth;
var chinese = "我们共同为建站事业而奋斗！";
chinese = chinese.split("");

var font_size = 10;
var columns = c.width/font_size;
//an array of drops - one per column
var drops = [];
for(var x = 0; x < columns; x++)
drops[x] = 1;
//drawing the characters
function draw()
{
ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
ctx.fillRect(0, 0, c.width, c.height);

ctx.fillStyle = "#0F0"; //green text
ctx.font = font_size + "px arial";
//looping over drops
for(var i = 0; i < drops.length; i++)
{
var text = chinese[Math.floor(Math.random()*chinese.length)];
ctx.fillText(text, i*font_size, drops[i]*font_size);

if(drops[i]*font_size > c.height && Math.random() > 0.975)
drops[i] = 0;

drops[i]++;
}
}
setInterval(draw, 33);
</script>
</body>
</html>