js实现canvas多彩正方体下落动画效果代码-html代码-BFW代码库

js实现canvas多彩正方体下落动画效果代码

代码语言：html

所属分类：动画

代码描述：js实现canvas多彩正方体下落动画效果代码

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


<!DOCTYPE html>
<html lang="en" >

<head>

  <meta charset="UTF-8">

  
  
  
  
<style>
* {
  padding: 0;
  margin: 0;
  overflow: hidden;
  background: #FFF;
}

canvas {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
</style>

</head>

<body>
  

  
      <script>
var W, M, c, C, WW, WH, CW, CH,
options, radian, num, colors,
animationId;

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

var makeCanvas = function () {
  document.
  getElementsByTagName("body")[0].
  appendChild(document.createElement("canvas"));
};

var initialize = function () {
  W = window;
  M = Math;
  c = document.getElementsByTagName("canvas")[0];
  C = c.getContext("2d");
  WW = c.width = 500;
  WH = c.height = 500;
  WD = M.sqrt(WW * WW + WH * WH);
  CW = WW / 2;
  CH = WH / 2;
  CD = WD / 2;
  num = 2;
  colors = ['#563672', '#8D3D77', '#C6427A', '#FD497F'];
  radian = Math.PI * 2 / 6;
  options = getOptions();
  c.style.background = 'white';
};

var getOptions = function () {
  var arr = new Array();
  var scale = 50;
  var yNum = Math.floor(WH / scale) + 3;
  var xNum = Math.floor(WW / scale) + 1;
  var gapY = M.cos(30 * M.PI / 180) * scale;
  var gapX = scale / 2;

  for (var y = 0; y < yNum; y++) {
    for (var x = 0; x < xNum; x++) {
      var ny = y * gapY;
      var nx = x * scale;
      var atan = M.atan2(ny, nx);
      var dx, dy, dist;

      /** [x, y, radius, dist, atan] */
      if (y % 2 === 0) {
        dx = CW - nx;
        dy = CH - ny;
        dist = M.sqrt(dx * dx + dy * dy) / CD * 1.5;
        arr.push([nx, ny,.........完整代码请登录后点击上方下载按钮下载查看