Мигающие разноцветные световые пятна на HTML5 Canvas
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<canvas id="canv"></canvas> <script> window.requestAnimFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; })(); var c = document.getElementById('canv'); var $ = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var _w = w * 0.5; var _h = h * 0.5; var arr = []; var cnt = 0; window.addEventListener('load', resize); window.addEventListener('resize', resize, false); function resize() { c.width = w = window.innerWidth; c.height = h = window.innerHeight; c.style.position = 'absolute'; c.style.left = (window.innerWidth - w) * .01 + 'px'; c.style.top = (window.innerHeight - h) * .01 + 'px'; } function anim() { cnt++; if (cnt % 6) draw(); window.requestAnimFrame(anim); } anim(); function draw() { var splot = { x: rng(_w - 900, _w + 900), y: rng(_h - 900, _h + 900), r: rng(20, 80), spX: rng(-1, 1), spY: rng(-1, 1) }; arr.push(splot); while (arr.length > 100) { arr.shift(); } $.clearRect(0, 0, w, h); for (var i = 0; i < arr.length; i++) { splot = arr[i];; $.fillStyle = rndCol(); $.beginPath(); $.arc(splot.x, splot.y, splot.r, 0, Math.PI * 2, true); $.shadowBlur = 80; $.shadowOffsetX = 2; $.shadowOffsetY = 2; $.shadowColor = rndCol(); $.globalCompositeOperation = 'lighter'; $.fill(); splot.x = splot.x + splot.spX; splot.y = splot.y + splot.spY; splot.r = splot.r * 0.96; } } function rndCol() { var r = Math.floor(Math.random() * 180); var g = Math.floor(Math.random() * 60); var b = Math.floor(Math.random() * 100); return "rgb(" + r + "," + g + "," + b + ")"; } function rng(min, max) { return Math.floor(Math.random() * (max - min + 1)) + min; } </script> |