canvas实现点击随机排列盖子效果代码-html代码-BFW代码库

canvas实现点击随机排列盖子效果代码

代码语言：html

所属分类：其他

代码描述：canvas实现点击随机排列盖子效果代码

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>
body {
  font-family: Arial, Helvetica, "Liberation Sans", FreeSans, sans-serif;
  background-color: #000;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border-width: 0;
  cursor: pointer;
}
</style>

  
  
  
</head>

<body >
  
  
      <script>
"use strict";

const DIST_BRIDSON_MIN = 0.08; // size of pattern - relative to canvas size
const DIST_BRIDSON_MAX = 0.15;

let canv, ctx; // canvas and context
let maxx, maxy; // canvas dimensions
let tr, distBridson;
let polygons, globHue;
let gr;

// for animation
let messages;
let colorMode = 1;

// shortcuts for Math.
const mrandom = Math.random;
const mfloor = Math.floor;
const mround = Math.round;
const mceil = Math.ceil;
const mabs = Math.abs;
const mmin = Math.min;
const mmax = Math.max;

const mPI = Math.PI;
const mPIS2 = Math.PI / 2;
const mPIS3 = Math.PI / 3;
const m2PI = Math.PI * 2;
const m2PIS3 = Math.PI * 2 / 3;
const msin = Math.sin;
const mcos = Math.cos;
const matan2 = Math.atan2;

const mhypot = Math.hypot;
const msqrt = Math.sqrt;

//------------------------------------------------------------------------

function alea(mini, maxi) {
  // random number in given range

  if (typeof maxi == "undefined") return mini * mrandom(); // range 0..mini

  return mini + mrandom() * (maxi - mini); // range mini..maxi
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
function intAlea(mini, maxi) {
  // random integer in given range (mini..maxi - 1 or 0..mini - 1)
  //
  if (typeof maxi == "undefined") return mfloor(mini * mrandom()); // range 0..mini - 1
  return mini + mfloor(mrandom() * (maxi - mini)); // range mini .. maxi - 1
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/*	============================================================================
This hash function is based upon Johannes Baagoe's carefully designed and efficient hash
function for use with JavaScript.  It has a proven "avalanche" effect such
that every bit of the input affects every bit of the output 50% of the time,
which is good.	See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml
============================================================================
*/
/* This function returns a hash function depending on a seed.

    if no seed is provided (or a falsy value), Math.random() is used.
    The returned function always returns the same number in the range [0..1[ for the
    same value of the argument. This argument may be a String or a Number or anything else
    which can be 'toStringed'
    Two returned functions obtained with two equal seeds are equivalent.
    */

function hashFunction(seed) {
  let n0 = 0xefc8249d;
  let n = n0;
  mash(seed || Math.random()); // pre-compute n for seed
  n0 = n; //

  function mash(data) {
    data = data.toString() + "U";
    n = n0;
    for (let i = 0; i < data.length; i++) {
      n += data.charCodeAt(i);
      var h = 0.02519603282416938 * n;
      n = h >>> 0;
      h -= n;
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