canvas开花动画效果代码-html代码-BFW代码库

canvas开花动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas开花动画效果代码

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>

  
      <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 = 2 * CSIZE;
  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;
  }
};

var colors = [];
var setColors = () => {
  colors = [];
  let colorCount = 2;
  let h = getRandomInt(180, 300);
  for (let i = 0; i < colorCount; i++) {
    let hd = Math.round(90 / colorCount) * i + getRandomInt(-10, 10);
    let hue = (h + hd) % 360;
    colors.push("hsl(" + hue + ",98%,60%)");
  }
};
setColors();

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

var stopped = true;
var t = 0;
var S = 2;
var s = 0;
function animate(ts) {
  if (stopped) return;
  t++;
  if (t < dur) draw();
  if (t == dur && ++s < S) {
    reset();
    t = 0;
  }
  if (t > dur + 200) {
    ctx.canvas.style.opacity = 1 - (t - dur - 200) / 60;
  }
  if (t > dur + 200 + 60) {
    reset();
    t = 0;
    s = 0;
    S = getRandomInt(1, 5);
    ctx.setTransform(1, 0, 0, 1, 0, 0);
    ctx.clearRect(0, 0, 2 * CSIZE, 2 * CSIZE);
    ctx.canvas.style.opacity = 1;
  }
  requestAnimationFrame(animate);
}

onresize();
.........完整代码请登录后点击上方下载按钮下载查看