js实现小蛇爬行canvas加载动画效果代码-html代码-BFW代码库

js实现小蛇爬行canvas加载动画效果代码

代码语言：html

所属分类：动画

代码描述：js实现小蛇爬行canvas加载动画效果代码

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>
svg {
  width: 85vw;
  opacity: 0;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

body {
  height: 100vh;
  overflow: hidden;
}

canvas {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

p {
  position: fixed;
  bottom: 10px;
  left: 0;
  width: 100%;
  text-align: center;
  font-family: "Antonio", sans-serif;
  letter-spacing: 0.01em;
}
</style>



</head>

<body  >
  <canvas></canvas>

<svg viewBox="0 0 543.7 232.6">
  <path d="M51.424,116.98317c0-170.16522,222.20155,0,222.20155,0s218.70567,170.16521,218.70567,0-218.70567-4.933-218.70567-4.933S51.424,287.14838,51.424,116.98317Z" fill="none" stroke="#3eab37" stroke-width="7"/>
</svg>

<p>Move your mouse or finger for more fun</p>

  
      <script  >


const canvas = document.querySelector('canvas');
const svg = document.querySelector('svg');
const ctx = canvas.getContext('2d');
let width = svg.clientWidth;
let height = svg.clientHeight;
const path = svg.querySelector('path');
const totalLength = path.getTotalLength();
let mouseX = 3;

let coordinates = [];

canvas.width = width;
canvas.height = height;

const gradients = [
[
[0, [190, 217, 2]],
[33, [107, 140, 1]],
[66, [80, 123, 5]],
[100, [57, 84, 0]]]];



const dots = [];
class Dot {
  constructor(x, y, color, delay, index) {
    this._x = x;
    this._y = y;
    this.x = x * width;
    this.y = y * height;
    this.r = width * 0.005 + Math.sin(delay) * width * 0.08;
    this.color = color;
    this.delay = delay;
    this.index = index;
  }
  resize() {
    this.x = this._x * width;
    this.y = this._y * height;
  }
  update(time) {
    const p = coordinates[Math.floor(time + this.delay * totalLength) % coordinates.length];
    this._x = p.x / 543.7;
    this._y = p.y / 232.6;
    this.x = this._x * width;
    this.y = this._y * height;
    this.r = width * 0.005 + Math.sin(this.delay) * width * 0.08;
  }
  draw() {
    if (this.index % mouseX === 0) {
      ctx.fillStyle = this.color;
      ctx.beginPath();
      ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);
      ctx.fill();
    }
  }}


/* ============ */
/* === INIT ===  */
/* ============ */
function init() {
  let sum_length = 0;
  for (let i = 0; i < totalLength * 0.9; i += 2) {
    const point = path.getPointAtLength(i);
    const x = point.x / 543.7;
    const y = point.y / 232.6;
    const RGB_color = getColor(0, totalLength, i / totalLength);
    const color = `rgb(${RGB_color[0]}, ${RGB_color[1]}, ${RGB_color[2]})`;

    const dot = new Dot(x, y, color, 1 - i / totalLength, i / 2);
    dots.push(dot);
    sum_length += 2;
  }

  for (let i = 0; i < totalLength; i += 1) {
    coordinates.push(path.getPointAtLength(i));
  }
}

/* Code copied from https://stackoverflow.com/a/30144587 */
function pickHex(color1, color2, weight) {
  var p = weight;
  var w = p * 2 - 1;
  var w1 = (w / 1 + 1) / 2;
  var w2 = 1 - w1;
  var rgb = [Math.round(color1[0] *.........完整代码请登录后点击上方下载按钮下载查看