canvas绘制动画效果代码-html代码-BFW代码库

canvas绘制动画效果代码

代码语言：html

所属分类：其他

代码描述：canvas绘制动画效果代码，对称式绘制。

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">

  
</head>

<body>

  
      <script >
"use strict"; // Paul Slaymaker, paul25882@gmail.com
const body = document.getElementsByTagName("body").item(0);
body.style.background = "#000";
const TP = 2 * Math.PI;
const CSIZE = 400;

const ctx = (() => {
  let d = document.createElement("div");
  d.style.textAlign = "center";
  body.append(d);
  let c = document.createElement("canvas");
  c.width = c.height = 2 * CSIZE;
  d.append(c);
  return c.getContext("2d");
})();
ctx.translate(CSIZE, CSIZE);

onresize = () => {
  let D = Math.min(window.innerWidth, window.innerHeight) - 40;
  ctx.canvas.style.width = ctx.canvas.style.height = D + "px";
};

const getRandomInt = (min, max, low) => {
  if (low) return Math.floor(Math.random() * Math.random() * (max - min)) + min;else
  return Math.floor(Math.random() * (max - min)) + min;
};

function start() {
  if (stopped) {
    requestAnimationFrame(animate);
    stopped = false;
  } else {
    stopped = true;
  }
}
ctx.canvas.addEventListener("click", start, false);

var rotation = 0;
var stopped = true;
var t = 0;
var duration = 1600;
function animate(ts) {
  if (stopped) return;
  t++;
  rotation += 0.02 / C;
  for (let i = 0; i < 2; i++) {
    F += 0.0024 / C;
    F2 += 0.0031 / C;
    lines[i].setLine();
    if (i % 2) lines[i].rotate(rotation);else
    lines[i].rotate(-rotation);
  }
  K = 120 + 100 * Math.sin(t / 60);
  K2 = 120 + 100 * Math.sin(t / 70);
  color.set();
  color2.set();
  color3.set();
  draw();
  requestAnimationFrame(animate);
}

ctx.lineWidth = 2;
var F = TP * Math.random();
var F2 = TP * Math.random();
var R = 380;
var K = 120;
var K2 = 100;

var Line = function (idx) {
  this.a = idx * TP / C + (C / 4 - 1) * TP / C / 2;
  this.dp1 = new DOMPoint();
  this.dp2 = new DOMPoint();
  this.rotate = z => {
    let dm2 = new DOMMatrix([Math.cos(z), Math.sin(z), -Math.sin(z), Math.cos(z), this.mx, this.my]);
    let dm3 = dm2.multiply(this.dm1);.........完整代码请登录后点击上方下载按钮下载查看