canvas图形绘制动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：canvas图形绘制动画效果代码

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">
  

  
</head>

<body translate="no">
  
  
      <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 CSO = 52;

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.setTransform(1, 0, 0, 1, CSIZE, CSIZE);

const ctxo = (() => {
  let c = document.createElement("canvas");
  c.width = c.height = 2 * CSO;
  return c.getContext("2d", { "willReadFrequently": true });
})();
ctxo.setTransform(1, 0, 0, 1, CSO, CSO);
ctxo.lineWidth = 1;

const ctxo2 = (() => {
  let c = document.createElement("canvas");
  c.width = c.height = 2 * CSO;
  return c.getContext("2d", { "willReadFrequently": true });
})();
ctxo2.setTransform(1, 0, 0, 1, CSO, CSO);

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 Color() {
  const CBASE = 64;
  const CT = 255 - CBASE;
  const RKO = Math.random();
  let GKO = Math.random();
  let BKO = Math.random();
  let RKK = 100 + 200 * Math.random();
  let GKK = 100 + 200 * Math.random();
  let BKK = 100 + 200 * Math.random();
  this.getRGB = () => {
    this.fr = 0.8 * (1 - Math.cos(RKO + t / this.RKF)) / 2;
    this.fg = 0.8 * (1 - Math.cos(GKO + t / this.GKF)) / 2;
    this.fb = 0.8 * (1 - Math.cos(BKO + t / this.BKF)) / 2;
    this.RK3 = 6 + 36 * (1 - Math.sin(t / RKK)) / 2;
    this.GK3 = 6 + 36 * (1 - Math.sin(t / GKK)) / 2;
    this.BK3 = 6 + 36 * (1 - Math.sin(t / BKK)) / 2;
    let red = Math.round(CBASE + CT * (1 + this.fr * Math.cos(this.RK2 + t / this.RK1) + (1 - this.fr) * Math.cos(this.RK2 + t / this.RK3)) / 2);
    let grn = Math.round(CBASE + CT * (1 + this.fg * Math.cos(this.GK2 + t / this.GK1) + (1 - this.fg) * Math.cos(this.GK2 + t / this.GK3)) / 2);
    let blu = Math.round(CBASE + CT * (1 + this.fb * Math.cos(this.BK2 + t / this.BK1) + (1 - this.fb) * Math.cos(this.BK2 + t / this.BK3)) / 2);
    return "rgb(" + red + "," + grn + "," + blu + ")";
  };
  this.randomize = () => {
    this.RK1 = 1000 + 1000 * Math.random();
    this.GK1 = 1000 + 1000 * Math.random();
    this.BK1 = 1000 + 1000 * Math.random();
    this.RK2 = TP * Math.random();
    this.GK2 = TP * Math.random();
    this.BK2 = TP * Math.random();
    this.RKF = 100 + 200 * Math.random();
    this.GKF = 100 + 200 * Math.random();
    this.BKF = 100 + 200 * Math.random();
  };
  this.randomize();
}

const dmx = new DOMMatrix([-1, 0, 0, 1, 0, 0]);
const dmy = new DOMMatrix([1, 0, 0, -1, 0, 0]);
const dmr = new DOMMatrix([0, 1, -1, 0, 0, 0]);

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

var t = 0;
var animate = ts => {
  if (stopped) return;
  t++;
  if (!(t % 5)) draw();
  requestAnimationFrame(animate);
};

const S6 = Math.sin(TP / 6);
const tta = [0, 0.5, S6, 1, S6, 0.5, 0, -0.5, -S6, -1, -S6, -0.5];
const ttb = [0, 1, 2, 2, 2, 1, 0, -1, -2, -2, -2, -1];

var drawTiles = () => {
  for (let i = 0; i < 12; i += 2) {
    let a1 = (i + 4) % 12,a2 = (i + 1) % 12,a3 = (i + 5) % 12,a4 = (i + 2) % 12;
    ctx.setTransform(tta[a1], tta[a2], tta[a3], tta[a4], CSIZE, CSIZE);
    ctx.drawImage(ctxo.canvas, 0, 0);
    a1 = (i + 4) % 12, a2 = (i + 1) % 12, a3 = (i + 3) % 12, a4 = (i + 0) % 12;
    ctx.setTransform(tta[a1], tta[a2], tta[a3], tta[a4], CSIZE, CSIZE);
    ctx.........完整代码请登录后点击上方下载按钮下载查看