canvas实现多彩粒子流动落下动画效果代码-html代码-BFW代码库

canvas实现多彩粒子流动落下动画效果代码

代码语言：html

所属分类：粒子

代码描述：canvas实现多彩粒子流动落下动画效果代码

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

<html lang="en">

<head>
    <meta charset="UTF-8">
    <style>
        * {
      font-family: "arial black", Helvetica, verdana, monospace, sans-serif;
      letter-spacing: 0.2rem;
      margin: 0;
      padding: 0;
      color: #fff;
      overflow: hidden;
    }
    
    body {
      position: relative;
    }
    
    canvas#canvas {
      display: block;
      background: #000;
    }
    
    #filter {
      position: absolute;
      top: 50%;
      left: 0;
      width: 100%;
      height: 50%;
      background: rgba(0, 0, 0, 0.6);
    }
    </style>

</head>

<body>
    <!-- partial:index.partial.html -->
    <canvas id="canvas" width="407" height="754">Canvas not supported.</canvas>
    <div id="filter"></div>
    <!-- partial -->
    <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;
    var mouseY = Y;
    var shapeNum = 1000;
    var shapes = [];
    var startColor = rand(0, 360);
    var style = {
      black: 'black',
      white: 'white',
      lineWidth: 4,
    };
    
    if (X < 768) {
      shapeNum = 500;
    }

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

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

    /********************
      Shape
    ********************/
     
    function Shape(ctx, x, y, c) {
      this.ctx = ctx;
      this.init(x, y, c);
    }
    
    Shape.prototype.init = function(x, y, c) {
      this.x = x;
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