canvas实现三元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实现三元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
<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;
}
</style>
</head>
<body>
<script >
"use strict";
window.addEventListener("load", function () {
const NBCOLORS = 3; // integer, >= 1
let lRef;
let initSpeed, rMax;
let canv, ctx; // canvas and context : global variables (I know :( )
let maxx, maxy; // canvas sizes (in pixels)
let particles;
let click;
let hues, angle0;
let org;
// 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;
//-----------------------------------------------------------------------------
// miscellaneous functions
//-----------------------------------------------------------------------------
function alea(min, max) {
// random number [min..max[ . If no max is provided, [0..min[
if (typeof max == 'undefined') return min * mrandom();
return min + (max - min) * mrandom();
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
function intAlea(min, max) {
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