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【HTML+CSS+JS花环特效——附源代码】

作者：互联网

目录

效果

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代码

index.html

<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>Spinner Thingy</title>

<link rel="stylesheet" href="css/style.css">

</head>
<body>

<canvas id="canvas"></canvas>

<script src='js/jjpbdkp.js'></script>
<script src="js/script.js"></script>

</body>
</html>

style.css

body, html {
  margin: 0;
}

canvas {
  display: block;
}

jjpbdkp.js

/*
  Johan Karlsson
  https://github.com/DonKarlssonSan/vectory
*/

"use strict";

class Vector {
  constructor(x, y) {
    this.x = x;
    this.y = y;
  }

  add(v) {
    return new Vector(
      this.x + v.x,
      this.y + v.y);
  }

  addTo(v) {
    this.x += v.x;
    this.y += v.y;
  }

  sub(v) {
    return new Vector(
      this.x - v.x,
      this.y - v.y);
  }
  
  subFrom(v) {
    this.x -= v.x;
    this.y -= v.y;
  }
  
  mult(n) {
    return new Vector(this.x * n, this.y * n);
  }
  
  multTo(n) {
    this.x *= n;
    this.y *= n;
    return this;
  }
  
  div(n) {
    return new Vector(this.x / n, this.y / n);
  }
  
  setAngle(angle) {
    var length = this.getLength();
    this.x = Math.cos(angle) * length;
    this.y = Math.sin(angle) * length;
  }
  
  setLength(length) {
    var angle = this.getAngle();
    this.x = Math.cos(angle) * length;
    this.y = Math.sin(angle) * length;
  }
  
  getAngle() {
    return Math.atan2(this.y, this.x);
  }
  
  getLength() {
    return Math.sqrt(this.x * this.x + this.y * this.y);
  }

  getLengthSq() {
    return this.x * this.x + this.y * this.y;
  }

  distanceTo(v) {
    return this.sub(v).getLength();
  }

  copy() {
    return new Vector(this.x, this.y);
  }
  
  equals(v) {
    return this.x == v.x && this.y == v.y;
  }
}

script.js

/*
  Johan Karlsson, 2019
  https://twitter.com/DonKarlssonSan
  MIT License, see Details View
*/
let canvas;
let ctx;
let w, h;
let size;
let circles;


class Circle {
  constructor(r) {
    this.r = r;
    let nrOfPoints = 24;
    this.points = [];
    for (let circlePoint = 0; circlePoint < nrOfPoints; circlePoint++) {
      let angle = Math.PI * 2 / nrOfPoints * circlePoint;
      let x = Math.cos(angle) * r;
      let y = Math.sin(angle) * r;
      this.points.push(new Vector(x, y));
    }
  }

  move() {
    let deltaAngle = 0.05 * this.r / size;
    this.points.forEach(p => {
      // https://en.wikipedia.org/wiki/Rotation_matrix
      // 
标签：circles,ctx,JS,HTML,let,circle,源代码,Math,points	

来源： https://blog.csdn.net/qq_44731019/article/details/121055905