粒子生长曲线效果-html代码-BFW代码库

粒子生长曲线效果

代码语言：html

所属分类：粒子

代码描述：粒子生长曲线效果，原生js编写，宛如植物一样生根发芽

代码标签：效果

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">


</head>
<body translate="no">

<script>
"use strict";

window.addEventListener("load", function () {

  const scaleX = 200;
  const lineW = 0.3; // line width

  const speed = 2; // intensity of field at the triangle vertices
  const nbParticles = 1000;
  const lifeTime = 400;

  let canv, ctx; // canvas and context
  let maxx, maxy; // canvas dimensions
  let nbx, nby; // number of triangles
  let xc, yc; // center of canvas

  let particles; // array of particles

  let xRect, yRect, hRect, rectSide;

  let bgColor;
  let lineColor;

  let requestID; // ID provided by window.requestAnimationFrame();

  let hue; // for particles
  let xp, yp;
  let pTarget;
  let fx;
  let moveMode = 'auto';
  // shortcuts for Math.
  const mrandom = Math.random;
  const mfloor = Math.floor;
  const mround = Math.round;
  const mceil = Math.ceil;
  const mabs = Math.abs;
  const mmin = Math.min;
  const mmax = Math.max;

  const mPI = Math.PI;
  const mPIS2 = Math.PI / 2;
  const m2PI = Math.PI * 2;
  const msin = Math.sin;
  const mcos = Math.cos;
  const matan2 = Math.atan2;

  const mhypot = Math.hypot;
  const msqrt = Math.sqrt;

  const rac3 = msqrt(3);
  const rac3s2 = rac3 / 2;
  const mPIS3 = Math.PI / 3;

  const sinPIS6 = 0.5;
  const cosPIS6 = rac3s2;
  const sinPIS3 = cosPIS6;
  const cosPIS3 = sinPIS6;

  //------------------------------------------------------------------------
  /*
   * A fast javascript implementation of simplex noise by Jonas Wagner
   *
   * Based on a speed-improved simplex noise algorithm for 2D, 3D and 4D in Java.
   * Which is based on example code by Stefan Gustavson (stegu@itn.liu.se).
   * With Optimisations by Peter Eastman (peastman@drizzle.stanford.edu).
   * Better rank ordering method by Stefan Gustavson in 2012.
   *
   *
   * Copyright (C) 2012 Jonas Wagner
   *
   * Permission is hereby granted, free of charge, to any person obtaining
   * a copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to .........完整代码请登录后点击上方下载按钮下载查看