canvas彩色线条绘制动画效果代码
代码语言:html
所属分类:动画
代码描述:canvas彩色线条绘制动画效果代码
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; cursor: pointer; } </style> </head> <body > <script > "use strict"; /* You'll find the word Lissajous because at the origin, the x and y coordinates were not random numbers. */ window.addEventListener("load", function () { const NBLISSAJOUS = 200; let canv, ctx; // canvas and context let maxx, maxy; // canvas dimensions let liss; // for animation let events; // 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 } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - /* ============================================================================ This is based upon Johannes Baagoe's carefully designed and efficient hash function for use with JavaScript. It has a proven "avalanche" effect such that every bit of the input affects every bit of the output 50% of the time, which is good. See: http://baagoe.com/en/RandomMusings/hash/avalanche.xhtml ============================================================================ */ /* This function returns a hash function depending on a seed. if no seed is provided (or a falsy value), Math.random() is used. The returned function always returns the same number in the range [0..1[ for the same value of the argument. This argument may be a String or a Number or anything else which can be 'toStringed' Two returned functions obtained with two equal seeds are equivalent. */ function hashFunction(seed) { let n0 = 0xefc8249d; let n = n0; mash(seed || Math.random()); // pre-compute n for seed n0 = n; // function mash(data) { data = data.toString() + 'U'; n = n0; for (le.........完整代码请登录后点击上方下载按钮下载查看
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