Снег, снежинки которого можно толкать на HTML5 Canvas и jQuery через плагин LET IT SNOW
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.snow { position:fixed; top:0px; left:0px; z-index:0; } |
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<canvas width="100" height="100" class="snow"></canvas> <script> /* =========================================================== * jquery-let_it_snow.js v1 * =========================================================== * NOTE: This plugin is based on the work by Jason Brown (Loktar00) * https://github.com/loktar00/JQuery-Snowfall * http://www.thepetedesign.com * * As the end of the year approaches, let's add * some festive to your website! * * https://github.com/peachananr/let_it_snow * * ========================================================== */ console.log($(window).height()) !function($){ var defaults = { speed: 0, interaction: true, size: 2, count: 200, opacity: 0, color: "#ffffff", windPower: 0, image: false }; $.fn.let_it_snow = function(options){ var settings = $.extend({}, defaults, options), el = $(this), flakes = [], canvas = el.get(0), ctx = canvas.getContext("2d"), flakeCount = settings.count, mX = -100, mY = -100; canvas.width = $(document).width(); canvas.height = $(document).height(); (function() { var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000 / 60); }; window.requestAnimationFrame = requestAnimationFrame; })(); function snow() { ctx.clearRect(0, 0, canvas.width, canvas.height); for (var i = 0; i < flakeCount; i++) { var flake = flakes[i], x = mX, y = mY, minDist = 100, x2 = flake.x, y2 = flake.y; var dist = Math.sqrt((x2 - x) * (x2 - x) + (y2 - y) * (y2 - y)), dx = x2 - x, dy = y2 - y; if (dist < minDist) { var force = minDist / (dist * dist), xcomp = (x - x2) / dist, ycomp = (y - y2) / dist, deltaV = force / 2; flake.velX -= deltaV * xcomp; flake.velY -= deltaV * ycomp; } else { flake.velX *= .98; if (flake.velY <= flake.speed) { flake.velY = flake.speed } switch (settings.windPower) { case false: flake.velX += Math.cos(flake.step += .05) * flake.stepSize; break; case 0: flake.velX += Math.cos(flake.step += .05) * flake.stepSize; break; default: flake.velX += 0.01 + (settings.windPower/100); } } var s = settings.color; var patt = /^#([\da-fA-F]{2})([\da-fA-F]{2})([\da-fA-F]{2})$/; var matches = patt.exec(s); var rgb = parseInt(matches[1], 16)+","+parseInt(matches[2], 16)+","+parseInt(matches[3], 16); flake.y += flake.velY; flake.x += flake.velX; if (flake.y >= canvas.height || flake.y <= 0) { reset(flake); } if (flake.x >= canvas.width || flake.x <= 0) { reset(flake); } if (settings.image == false) { ctx.fillStyle = "rgba(" + rgb + "," + flake.opacity + ")" ctx.beginPath(); ctx.arc(flake.x, flake.y, flake.size, 0, Math.PI * 2); ctx.fill(); } else { ctx.drawImage($("img#lis_flake").get(0), flake.x, flake.y, flake.size * 2, flake.size * 2); } } requestAnimationFrame(snow); }; function reset(flake) { if (settings.windPower == false || settings.windPower == 0) { flake.x = Math.floor(Math.random() * canvas.width); flake.y = 0; } else { if (settings.windPower > 0) { var xarray = Array(Math.floor(Math.random() * canvas.width), 0); var yarray = Array(0, Math.floor(Math.random() * canvas.height)) var allarray = Array(xarray, yarray) var selected_array = allarray[Math.floor(Math.random()*allarray.length)]; flake.x = selected_array[0]; flake.y = selected_array[1]; } else { var xarray = Array(Math.floor(Math.random() * canvas.width),0); var yarray = Array(canvas.width, Math.floor(Math.random() * canvas.height)) var allarray = Array(xarray, yarray) var selected_array = allarray[Math.floor(Math.random()*allarray.length)]; flake.x = selected_array[0]; flake.y = selected_array[1]; } } flake.size = (Math.random() * 3) + settings.size; flake.speed = (Math.random() * 1) + settings.speed; flake.velY = flake.speed; flake.velX = 0; flake.opacity = (Math.random() * 0.5) + settings.opacity; } function init() { for (var i = 0; i < flakeCount; i++) { var x = Math.floor(Math.random() * canvas.width), y = Math.floor(Math.random() * canvas.height), size = (Math.random() * 3) + settings.size, speed = (Math.random() * 1) + settings.speed, opacity = (Math.random() * 0.5) + settings.opacity; flakes.push({ speed: speed, velY: speed, velX: 0, x: x, y: y, size: size, stepSize: (Math.random())/30, step: 0, angle: 180, opacity: opacity }); } snow(); } if (settings.image != false) { $("<img src='"+settings.image+"' style='display: none' id='lis_flake'>").prependTo("body") } init(); $(window).resize(function() { if(this.resizeTO) clearTimeout(this.resizeTO); this.resizeTO = setTimeout(function() { el2 = el.clone(); el2.insertAfter(el); el.remove(); el2.let_it_snow(settings); }, 200); }); if (settings.interaction == true) { canvas.addEventListener("mousemove", function(e) { mX = e.clientX, mY = e.clientY }); } } }(window.jQuery); $(document).ready(function () { $("canvas.snow").let_it_snow(); }); </script> |
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