canvas彩色线条旋转交织动画效果代码-html代码-BFW代码库

canvas彩色线条旋转交织动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas彩色线条旋转交织动画效果代码

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

  
  
  
</head>

<body translate="no">
  
  
      <script >
"use strict";

const LIMIT_FRACT = 5; // in pixels
const DURATION = 1500; // in ms, for each recursion level

let canv, ctx; // canvas and context
let maxx, maxy; // canvas dimensions

// for animation
let messages;
let dragon;
let baseline, basep;
let clear = false;

const b90 = 4 / 3 * (Math.sqrt(2) - 1); // to draw 1/4 circle with Bézier curves

// 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;

const rac2s2 = msqrt(2) / 2;

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

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
}

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

function middle(p0, p1) {
  return { x: (p0.x + p1.x) / 2, y: (p0.y + p1.y) / 2 };
} // mid.........完整代码请登录后点击上方下载按钮下载查看