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HTML5 canvas implements waterfall flow text effect code

小云云Original: 2018-02-02 10:38:192484browse

This article mainly introduces to you the relevant information about the sample code of HTML5 canvas waterfall flow text effect. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Let me share with you a waterfall flow text effect formed using HTML5 canvas, it is very cool! The relevant code is as follows:

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>cloth</title>
  <style>
    *{
  padding: 0;
  margin: 0;
}
body{
 background:#000;
}   
  </style>
</head>
<body>
  <p id="container">
 <canvas id="c"></canvas>
</p>
<script type="text/javascript" src="http://cdn.gbtags.com/jquery/1.11.1/jquery.min.js"></script>
<script>
    var c = document.getElementById("c");
var ctx = c.getContext("2d");

//制作全屏
c.height = window.innerHeight;
c.width = window.innerWidth;

//汉字从Unicode字符集
var chinese = "igeekbar~";
//将字符串转换为一个数组中的单个字符
chinese = chinese.split("");

var font_size = 20;
var columns = c.width/font_size; //雨的列数
//每列的一个数组
var drops = [];
//下面是×坐标
//1 = y 在下降（最初是相同的）
for(var x = 0; x < columns; x++)
 drops[x] = 1; 

//画
function draw()
{
 //黑BG的帆布
 //半透明BG显示轨迹
 ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
 ctx.fillRect(0, 0, c.width, c.height);
 
 ctx.fillStyle = "#0F0"; //字体颜色
 ctx.font = font_size + "px arial";
 //循环字体
 for(var i = 0; i < drops.length; i++)
 {
  //随机汉字打印
  var text = chinese[Math.floor(Math.random()*chinese.length)];
  //x = i*font_size, y = value of drops[i]*font_size
  ctx.fillText(text, i*font_size, drops[i]*font_size);
  
  //在屏幕上划线后，把它的顶部随机发送到顶部
  //将一个随机性添加到复位中，使分散在轴上的下降
  if(drops[i]*font_size > c.height && Math.random() > 0.975)
   drops[i] = 0;
  
  //增加的Y坐标
  drops[i]++;
 }
}

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

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