canvas纹理背景效果-html代码-BFW代码库

canvas纹理背景效果

代码语言：html

所属分类：背景

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;
  margin:0;
  padding:0;
  border-width:0;
}
</style>

</head>
<body translate="no">

<script>
"use strict";

window.addEventListener("load",function() {

  let canv, ctx;   // canvas and context : global variables (I know :( )
  let maxx, maxy;  // canvas sizes (in pixels)
  let orgx, orgy;  // position of the top left corner
  let nbx, nby;
  let bgColor;
  let rndGen, rndCol;
  let squarel;
  let fibrous;
// 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 m2PI = Math.PI * 2;
  const msin = Math.sin;
  const mcos = Math.cos;
  const matan2 = Math.atan2;

  const mhypot = Math.hypot;
  const msqrt = Math.sqrt;
  
  const rac3   = msqrt(3);
  const rac3s2 = rac3 / 2;
  const mPIS3 = Math.PI / 3;

//-----------------------------------------------------------------------------
// miscellaneous functions
//-----------------------------------------------------------------------------

/* based on a function found at https://www.grc.com/otg/uheprng.htm
and customized to my needs

use :
  x = Mash('1213'); // returns a resettable, reproductible pseudo-random number generator function
  x = Mash();  // like line above, but uses Math.random() for a seed
  x();         // returns pseudo-random number in range [0..1[;
  x.reset();   // re-initializes the sequence with the same seed. Even if Mash was invoked without seed, will generate the same sequence.
  x.seed;      // retrieves the internal seed actually used. May be useful if no seed or non-str.........完整代码请登录后点击上方下载按钮下载查看