canvas实现鼠标交互鱼鳞变色动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：动画

代码描述：canvas实现鼠标交互鱼鳞变色动画效果代码

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 {
  font-family: Arial, Helvetica, "Liberation Sans", FreeSans, sans-serif;
  background-color: #000;
  margin: 0;
  padding: 0;
  border-width: 0;
  overflow: hidden;
  /*  cursor: pointer; */
}
</style>


</head>

<body translate="no">
  
  
      <script>
"use strict";

let canv, ctx; // canvas and context
let maxx, maxy; // canvas dimensions

// for animation
let messages;
let dx, dy, radius;
let nbx, nby;
let colors;
let grid;
let sn;
let mousePos, currentPos;

// 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 mPIS3 = Math.PI / 3;
const m2PI = Math.PI * 2;
const m2PIS3 = Math.PI * 2 / 3;
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;

//------------------------------------------------------------------------

function alea(mini, maxi) {
  // random number in given range

  if (typeof maxi == "undefined") return mini * mrandom(); // range 0..mini

  return mini + mrandom() * (maxi - mini); // range mini..maxi
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
function intAlea(mini, maxi) {
  // random integer in given range (mini..maxi - 1 or 0..mini - 1)
  //
  if (typeof maxi == "undefined") return mfloor(mini * mrandom()); // range 0..mini - 1
  return mini + mfloor(mrandom() * (maxi - mini)); // range mini .. maxi - 1
}
//------------------------------------------------------------------------
function lerp(p0, p1, alpha) {
  return {
    x: p1.x * alpha + p0.x * (1 - alpha),
    y: p1.y * alpha + p0.y * (1 - alpha) };

}
//------------------------------------------------------------------------
// S I M P L E X   N O I S E
//------------------------------------------------------------------------
/* simplified by Dillon https://codepen.io/Dillo
        The original file contains noise2D, noise3D and noise4D
        */
/*
 * 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 whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
(function () {
  "use strict";

  var F2 = 0.5 * (Math.sqrt(3.0) - 1.0),
  G2 = (3.0 - Math.sqrt(3.0)) / 6.0,
  F3 = 1.0 / 3.0,
  G3 = 1.0 / 6.0,
  F4 = (Math.sqrt(5.0) - 1.0) / 4.0,
  G4 = (5.0 - Math.sqrt(5.0)) / 20.0;

  function SimplexNoise(random) {
    if (!random) random = Math.random;
    this.p = new Uint8Array(256);
    this.perm = new Uint8Array(512);
    this.permMod12 = new Uint8Array(512);
    for (var i = 0; i < 256; i++) {
      this.p[i] = random() * 256;
    }
    for (i = 0; i < 512; i++) {
      this.perm[i] = this.p[i & 255];
      this.permMod12[i] = this.perm[i] % 12;
    }
  }
  SimplexNoise.prototype = {
    grad3: new Float32Array([
    1,
    1,
    0,
    -1,
    1,
    0,
    1,
    -1,
    0,

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