canvas实现花朵生长展开动画效果代码-html代码-BFW代码库

canvas实现花朵生长展开动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas实现花朵生长展开动画效果代码

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 EM = location.href.endsWith("em");
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);
ctx.globalCompositeOperation = "destination-over";

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 = 160;
  const CT = 255 - CBASE;
  this.getRGB = () => {
    let red = Math.round(CBASE + CT * (this.fr * Math.cos(this.RK2 + t / this.RK1) + (1 - this.fr) * Math.cos(t / this.RK3)));
    let grn = Math.round(CBASE + CT * (this.fg * Math.cos(this.GK2 + t / this.GK1) + (1 - this.fg) * Math.cos(t / this.GK3)));
    let blu = Math.round(CBASE + CT * (this.fb * Math.cos(this.BK2 + t / this.BK1) + (1 - this.fb) * Math.cos(t / this.BK3)));
    return "rgb(" + red + "," + grn + "," + blu + ")";
  };
  this.randomizeF = () => {
    this.RK3 = 1 + 6 * Math.random();
    this.GK3 = 1 + 6 * Math.random();
    this.BK3 = 1 + 6 * Math.random();
    this.fr = 1 - Math.pow(0.9 * Math.random(), 5);
    this.fg = 1 - Math.pow(0.9 * Math.random(), 5);
    this.fb = 1 - Math.pow(0.9 * Math.random(), 5);
  };
  this.randomize = () => {
    this.RK1 = 160 + 160 * Math.random();
    this.GK1 = 160 + 160 * Math.random();
    this.BK1 = 160 + 160 * Math.random();
    this.RK2 = TP * Math.random();
    this.GK2 = TP * Math.random();
    this.BK2 = TP * Math.random();
    this.randomizeF();
  };
  this.randomize();
}

var colors = [new Color(), new Color()];
const KT = 12000;

var Circle = function (k1) {
  this.randomize = () => {
    this.maxr = 20 + 60 * Math.random();
    this.ka = (80 + 160 * Math.random()) * [-1, 1][getRandomInt(0, 2)];
    this.alpha = TP / 8 - TP / 4 * Math.random();
    this.er = 1 + 3 * Math.pow(Math.random(), 4);
    this.erk = (20 + 100 * Math.random()) * [-1, 1][getRandomInt(0, 2)];
  };
  this.randomize();
  this.getPath = () => {
    let p = new Path2D();
    let rr = Math.max(0, this.r);
    p.ellipse(this.x, this.y, rr, rr / this.er, t / this.erk, 0, TP);
    return p;
  };
  this.extend = () => {
    if (this.cc) {
    .........完整代码请登录后点击上方下载按钮下载查看