canvas实现烟花绽放动画效果代码-html代码-BFW代码库

canvas实现烟花绽放动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas实现烟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;
  background: black;
  overflow: hidden;
}
</style>

  
  
</head>

<body>
  <canvas id="fireworksCanvas"></canvas>

      <script >
const canvas = document.getElementById("fireworksCanvas");
const ctx = canvas.getContext("2d");

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

function resizeCanvas() {
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
}

window.addEventListener("resize", resizeCanvas, false);

class Firework {
  constructor() {
    this.x = Math.random() * canvas.width;
    this.y = canvas.height;
    this.sx = Math.random() * 3 - 1.5;
    this.sy = Math.random() * -3 - 3;
    this.size = Math.random() * 2 + 1;
    this.shouldExplode = false;

    const colorVal = Math.round(0xffffff * Math.random());
    const r = colorVal >> 16;
    const g = colorVal >> 8 & 255;
    const b = colorVal & 255;
    this.r = r;
    this.g = g;
    this.b = b;
  }

  update() {
    if (
    this.sy >= -2 ||
    this.y <= 100 ||
    this.x <= 0 ||
    this.x >= canvas.width)
    {
      this.shouldExplode = true;
    } else {
      this.sy += 0.01;
    }
    this.x += this.sx;
    this.y += this.sy;
  }

  draw() {
    ctx.fillStyle = `rgb(${this.r},${this.g},${this.b})`;
    ctx.beginPath();
    ctx.arc(this.x, this.y, t.........完整代码请登录后点击上方下载按钮下载查看