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JS
console.clear(); (function() { //setup document var w = document.width > 200 ? document.width : 600; var h = document.height > 200 ? document.height : 600; var hyp = Math.sqrt((w*w)+(h*h)) / 2; var canvas = document.getElementById('area'); canvas.width = w; canvas.height = h; var ctx = canvas.getContext("2d"); var color = [158, 213, 228]; //get particle origin var origin = [w/2, h * 4/5]; var getParticle = function() { return [origin[0], origin[1], Math.random()*360, Math.random()*2+1]; }; var particles = (function() { var arr = [],i=0; while(i++ < 200) arr.push(getParticle()); return arr; })(); var fountain = function() { if (particles.length < 1500) particles.push(getParticle(), getParticle()); }; var render = function() { [].forEach.call(particles, function(particle, i) { //get new position for particle particle[0] += particle[3] * Math.cos(particle[2]); particle[1] += particle[3] * -1;// Math.sin(particle[2]); //get distance from origin var diffX = particle[0] - origin[0]; var diffY = particle[1] - origin[1]; var dis = Math.sqrt((diffX*diffX)+(diffY*diffY)); //add twirl at 30% distance from origin if (dis > hyp*0.3) { particle[1] += particle[3] * Math.sin(particle[2]); particle[2] += 0.05; } //fade out at distance var alpha = 1;// - (dis/(hyp*0.5)); //determine particle size var size = i%2 == 0 ? 1 : 2; //draw this particle ctx.fillStyle = 'rgba('+color.join()+','+alpha+')'; ctx.fillRect(particle[0],particle[1],size,size); }); }; (function step() { requestAnimationFrame(step); ctx.clearRect(0,0,w,h); fountain(); render(); })(); })();
CSS
html,body { background:black; -webkit-background-size:cover; -moz-background-size:cover; background-size:cover; overflow:hidden; margin:0; position:relative; height:100%; padding:0; }
HTML
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