原生js实现三角背景旋转虚幻效果-html代码-BFW代码库

原生js实现三角背景旋转虚幻效果

代码语言：html

所属分类：背景

代码描述：原生js实现三角背景旋转虚幻效果

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<style>
* {
  margin: 0;
  padding: 0;
  color: #FFF;
}

canvas#canvas {
  display: block;
  background: #000;
}

ul#navigation {
  position: absolute;
  height: 100%;
  top: 0;
  right: 0;
  text-align: center;
  margin-right: 1.6rem;
  font-size: 0.8rem;
  -webkit-writing-mode: vertical-rl;
      -ms-writing-mode: tb-rl;
          writing-mode: vertical-rl;
}

ul#navigation > li {
  display: inline-block;
}
</style>

</head>
<body translate="no">
<canvas id="canvas">Canvas not supported.</canvas>
<ul id="navigation">
<li>Scroll up and down.</li>
</ul>

<script >
(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
        Random Number
      ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }

    /********************
        Var
      ********************/

    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    var mouseX = X / 2;
    var mouseY = Y / 2;
    var shapes = [];
    var shapeNum = 100;
    var angle = 360 / 3;
    var radian = angle * Math.PI / 180;
    var hsl = rand(0, 360);

    /********************
                              Animation
                            ********************/

    window.requestAnimationFrame =
    window.requestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (cb) {
      setTimeout(cb, 17);
    };

    /********************
         Shape
       ********************/

    function Shape(ctx, x, y, i) {
      this.ctx = ctx;
      this.init(x, y, i);
    }

    Shape.prototype.init = function (x, y, i) {
      this.x = x;
      this.y = y;
      this.i = i;
      this.r = 15 * i;
      this.a = 1 * i;
      this.rad = this.a * Math.PI / 180;
    };

    Shape.prototype.draw = function () {
      var ctx = this.ctx;
      ctx.save();
      ctx.strokeStyle = 'hsl(' + hsl + ', ' + (100 - this.i) + '%, ' + (100 - this.i) + '%';;
      ctx.lineWidth = 0.4;
      ctx.translate(this.x, this.y);
      ctx.rotate(Math.sin(this.rad * 3));
      ctx.translate(-this.x, -this.y);
      ctx.beginPath();
      ctx.moveTo(Math.sin(this.rad) * 100 + Math.sin(radian * 1) * this.r + this.x, Math.cos(this.rad) * 100 + Math.cos(radian * 1) * this.r + this.y);
      ctx.li.........完整代码请登录后点击上方下载按钮下载查看