wtc-math实现鲜花绽放动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：wtc-math实现鲜花绽放动画效果代码

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 {
  margin: 0;
  overflow: hidden;
}
canvas {
  height: 100vh;
  width: 100vw;
}
</style>



</head>

<body>
  


  
      <script type="module">
import { Vec2, Vec3, Vec4 } from 'https://cdn.skypack.dev/wtc-math';
import {
floatRandomBetween,
clamp,
lerp,
hash21,
precisionRound,
fract,
xmur3 } from
'https://cdn.skypack.dev/@liamegan1/le-utils@0.0.1';

console.clear();

const c = document.createElement('canvas');
c.width = window.innerWidth * 2;
c.height = window.innerHeight * 2;
const ctx = c.getContext('2d');
document.body.appendChild(c);

const dimensions = new Vec2(c.width, c.height);

let lastFlower;
function newFlower() {var _lastFlower;
  if ((_lastFlower = lastFlower) !== null && _lastFlower !== void 0 && _lastFlower.playing) lastFlower.playing = false;
  ctx.fillStyle = '#222A33';
  ctx.fillRect(0, 0, c.width, c.height);
  console.clear();
  let pistilRadius = floatRandomBetween(30, 100);
  let petalSets = Math.floor(Math.random() * 2. + 1.);
  let petalsets = [];
  let petalColour;
  let petalColour2;
  const differentColours = Math.random() > .5;
  for (let i = 0; i < petalSets; i++) {
    if (i == 0 || differentColours) {
      petalColour = new Vec4(Math.random(), Math.random(), Math.random(), 1.);
      petalColour2 = petalColour.scaleNew(.5);
    }
    if (Math.random() < .5) petalColour2 = petalColour.scaleNew(.1);
    if (Math.random() < .5) petalColour2 = new Vec4(Math.random(), Math.random(), Math.random(), 1.);
    let petals = Math.floor(floatRandomBetween(5, 20));
    let petalSize = floatRandomBetween(50, 200);
    let petalWidth = randomBetweenWithinRatio(.05, 1., petalSize, 100);
    let petalSoftness = floatRandomBetween(0, 1.5);
    let petalRoundness = floatRandomBetween(0, 1.5);
    let angle = floatRandomBetween(-Math.PI, Math.PI);
    let angle2 = angle + floatRandomBetween(0., 1.);
    if (Math.random() < .6) angle2 = angle;
    let stamen = Math.random() < .7;
    let stamenNum = Math.floor(floatRandomBetween(3., petals));
    let stamenColour = new Vec4(Math.floor(Math.random() * 3. + .5, 1.), Math.floor(Math.random() * 3. + .5, 1.), Math.floor(Math.random() * 1.5, 1.), 1.);
    petalsets.push({
      petalColour,
      petalColour2,
      petals,
      petalSize,
      petalWidth,
      petalSoftness,
      petalRoundness,
      angle,
      angle2,
      stamen,
      stamenNum,
      stamenColour });

  }
  // console.log(JSON.stringify({
  //   petalsets,
  //   pistilRadius
  // }));
  /*
  const obj = JSON.parse('{"petalsets":[{"petalColour":{"_x":0.477852237205874,"_y":0.4820507679496153,"_z":0.9334362669733784,"_w":0.01},"petalColour2":{"_x":0.6241541587391757,"_y":0.6101617046100201,"_z":0.8805453640242542,"_w":0.01},"petals":6,"petalSize":150,"petalWidth":0.6,"petalSoftness":0.5,"petalRoundness":0.2}],"pistilRadius":90.76264998849118}');
  for (let i in obj.petalsets[0]) {
    if(obj.petalsets[0][i]._x) {
      obj.petalsets[0][i] = new Vec4(obj.petalsets[0][i]._x, obj.petalsets[0][i]._y, obj.petalsets[0][i]._z, obj.petalsets[0][i]._w);
    }
  }
  lastFlower = buildFlower(obj);
  */

  const obj = {
    petalsets,
    pistilRadius };

  if (Math.random() < .2) {
    obj.pistilColour = new Vec4(.4, .2, .1, 1);
    obj.pistilColour2 = new Vec4(-.5, -.5, -.5, 1);
  }

  lastFlower = buildFlower(obj);
}

window.addEventListener('resize', () => {
  c.width = window.innerWidth * 2;
  c.height = window.innerHeight * 2;
  dimensions.reset(c.width, c.height);
  newFlower();
});

function clampVec4(v) {
  return new Vec4(clamp(0., 1., v.x), clamp(0., 1., v.y), clamp(0., 1., v.z), clamp(0., 1., v.w));
}
function vec4ToRGBA(v) {
  v = clampVec4(v);
  return `RGBA(${Math.floor(v.x * 255)}, ${Math.floor(v.y * 255)}, ${Math.floor(v.z * 255)}, ${v.w})`;
}

const buildFlower = function ({
  pos = dimensions.scaleNew(.5),
  petalsets = [{
    petals: 6,
    petalSize: 100,
    petalSize2: 0,
    petalColour: new Vec4(.8, .6, 1, 1),
    petalColour2: petalColour.scaleNew(.7),
    petalWidth: .9,
    petalWidth2: 0,
    petalSoftness: .5,
    petalRoundness: .2 }],

  pistilRadius = 60,
  pistilRadius2 = 0,
  pistilColour = new Vec4(1, .7, .4, 1),
  pistilColour2 = pistilColour.scaleNew(2.5),
  animationTime = 1000 } =
{}) {

  let maxWidth = 0;
  const petalCanvases = [];
  petalsets.forEach(petal => {
    const c = document.createElement('canvas');
    c.width = (pistilRadius + petal.petalSize) * 2 + 100;
    c.height = (pistilRadius + petal.petalSize) * 2 + 100;
    maxWidth = Math.max(c.width, maxWidth);
    const offset = c.width * .5;
    const ctx = c.getContext('2d');
    petalCanvases.push({
      c: c,
      ctx: ctx,
      offset: offset });

  });

  const pistilCanvas = document.createElement('canvas');
  pistilCanvas.width = maxWidth;
  pistilCanvas.height = maxWidth;
  const pistilCOffset = pistilCanvas.width * .5;
  const pistilCTX = pistilCanvas.getContext('2d');

  const reference = {
    playing: true };


  let lastTime;
  function draw(delta) {
    if (!reference.playing) return;
    if (!lastTime) {
      lastTime = delta;
    }
    const t = delta - lastTime;
    const l = t / animationTime;

    const petalL = clamp(0., 1., l * 1.5 - .5);
    let _pistilRadius = lerp(0, pistilRadius, clamp(0, 1, l * 2.));
    let _pistilColour = Vec4.lerp(petalsets[0].petalColour, pistilColour, petalL);

    const shadeL = clamp(0, 1, l - 1.);
    _pistilColour = Vec4.lerp(_pistilColour, pistilColour2, shadeL);
    _pistilRadius = lerp(_pistilRadius, pistilRadius2, shadeL);

    petalsets.forEach((petalset, pi) => {
      let {
        petals,
        petalSize,
        petalSize2 = 0,
        petalColour,
        petalColour2 = petalColour,
        petalWidth,
        petalWidth2 = 0,
        petalSoftness,
        petalRoundness,
        angle,
        a.........完整代码请登录后点击上方下载按钮下载查看