canvas实现可调参数的下雪积雪粒子动画效果代码-html代码-BFW代码库

canvas实现可调参数的下雪积雪粒子动画效果代码

代码语言：html

所属分类：粒子

代码描述：canvas实现可调参数的下雪积雪粒子动画效果代码

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>
/*
global
*/
*, *::before, *::after {
    margin: 0;
    padding: 0;
    border: 0;
    box-sizing: border-box;
}

*:focus {
    outline: none;
}

body {
    height: 100vh;
    background-color: #111;
    overflow: hidden;
}

canvas {
    touch-action: none;
}
</style>


  
  
</head>

<body translate="no">
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/Stats-16.js"></script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/dat.gui-min.js"></script>
      <script  >
//---

'use strict';

//---

console.clear();

//---

let stats = null;
let gui = null;

//---

let w = 0;
let h = 0;

let animationFrame = null;
let isTouchDevice = false;

const canvas = document.createElement('canvas');
const context = canvas.getContext('2d', { willReadFrequently: false, alpha: false });

let imageData = null;
let imageDataWidth = 0;
let data = null;

let buffer = null;
let bufferBorder = 0;

const center = { x: w / 2, y: h / 2 };
const border = { left: 0, top: 1, right: w, bottom: h };

let pointer = { x: 0, y: 0 };
let pointerPos = { x: center.x, y: center.y };
let pointerDownButton = -1;
let pointerActive = false;

const pointerMoveTimeoutTime = 2500;

//---

const particlePropertiesAmount = 7;

let particleAmount = 75000;
let particleHolderLength = 0;
let particleHolder = null;
let particleSpeedFactor = 10;
let particlesRGBMax = 255;
let particlesRGBMin = 25;
let particleSpeedFactorSquare = particleSpeedFactor * particleSpeedFactor;

let deltaTime = 0.175; //0.075;

let waveFrequency = 0.005;
let waveAmplitude = 2;
let windStrength = 0.055;

//---

let clearPixelData = null;
let clearRowSize = 0;
let clearRow = null;

let bgColorR = 17;
let bgColorG = 17;
let bgColorB = 17;

//---

let sinTableLength = 0;
let sinTable = null;

//---

function init() {

  isTouchDevice = 'ontouchstart' in window || navigator.maxTouchPoints > 0 || navigator.msMaxTouchPoints > 0;

  //---

  if (isTouchDevice === true) {

    canvas.addEventListener('touchmove', cursorMoveHandler, false);
    canvas.addEventListener('touchend', cursorLeaveHandler, .........完整代码请登录后点击上方下载按钮下载查看