three实现canvas阴阳八卦图旋转动画效果代码-html代码-BFW代码库

three实现canvas阴阳八卦图旋转动画效果代码

代码语言：html

所属分类：动画

代码描述：three实现canvas阴阳八卦图旋转动画效果代码

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{
  overflow: hidden;
  margin: 0;
  background-color: #600;
}
canvas {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  /*border: 1px solid red;*/
}
</style>

  
  
</head>

<body>
  <canvas id="cnv"></canvas>
  
      <script  type="module">
import {
Vector2,
Clock,
MathUtils } from
"//repo.bfw.wiki/bfwrepo/js/module/three/build/157/three.module.js";
console.clear();

let unit = n => {
  return n * c.width * 0.005;
};

class Petal {
  constructor(params) {
    this.angularSize = params.angularSize;
    this.angularPos = params.angularPos;
    this.angularSpeed = params.angularSpeed;
    this.width = params.width;
    this.borderThickiness = params.thickness;
    this.border = params.border;
    this.color = params.color;

    this.distance = params.distance;

    this.mediators = {
      v: new Vector2(),
      c: new Vector2() };

  }

  draw($) {
    let m = this.mediators;
    let v = m.v;
    let c = m.c;
    //$.save();
    $.lineWidth = this.borderThickness;
    $.strokeStyle = this.border;
    $.fillStyle = this.color;
    $.lineCap = "round";
    $.lineJoin = "round";
    $.beginPath();
    let rMax = Math.min(
    unit(90),
    Math.max(unit(50), this.distance + this.width * 0.5));

    let rMin = Math.min(
    unit(90),
    Math.max(unit(50), this.distance - this.width * 0.5));


    v.set(rMax, 0).rotateAround(c, -this.angularSize * 0.5 + this.angularPos);
    //console.log(v);
    $.moveTo(v.x, v.y);
    $.arc(
    0,
    0,
    rMax,
    -this.angularSize * 0.5 + this.angularPos,
    this.angularSize * 0.5 + this.angularPos);

    $.arc(
    0,
    0,
    rMin,
    this.angularSize * 0.5 + this.angularPos,
    -this.angularSize * 0.5 + this.angularPos,
    true);

    $.lineTo(v.x, v.y);

    $.fill();
    $.stroke();
    //$.restore();
  }}


class Flower {
  constructor(amount) {
    this.amount = amount;
    this.petals = [];
    this.petalsIndex = [];
    this.init();
  }
  init() {
    for (let i = 0; i < this.amount; i++) {
      let petal = new Petal({
        angularSize: (Math.random() * 0.5 + 0.5) * Math.PI / 3,
        angularPos: Math.random() * Math.PI * 2,
        angularSpeed:
        (Math.random() * 0.5 + 0.5) *
        Math.sign(Math.random() - 0.5) *
        Math.PI *
        0.1,
        width: unit((Math.random() * 0.5 + 0.5) * 20),
        borderThickiness: unit(1),
        border: "#f00",
        color: Math.random() < 0.5 ? "#faa" : "#f44",
        distance: unit(Math.random() * 87) });

      this.petals.push(petal);
      this.petalsIndex.push(i);
    }
  }
  update($, t) {
    this.petalsIndex.forEach(idx => {
      let petal = this.petals[idx];
      petal.distance = (petal.distance + t * unit(20)) % unit(100);
      petal.angularPos += petal.angularSpeed * t;
      petal.draw($);
    });
  }}


class Display {
  constructor() {
    this.size = 64;
    this.elements = [];
    this.el.........完整代码请登录后点击上方下载按钮下载查看