色狼福利导航
导航

色狼福利导航

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/* * Settings */ var settings = { particles: { length: 500, // maximum amount of particles duration: 2, // particle duration in sec velocity: 100, // particle velocity in pixels/sec effect: -0.75, // play with this for a nice effect size: 30, // particle size in pixels }, }; /* * RequestAnimationFrame polyfill by Erik M?ller */ (function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a= duration && firstActive != firstFree) { firstActive++; if (firstActive == particles.length) firstActive = 0; } }; ParticlePool.prototype.draw = function(context, image) { // draw active particles if (firstActive < firstFree) { for (i = firstActive; i < firstFree; i++) particles[i].draw(context, image); } if (firstFree < firstActive) { for (i = firstActive; i < particles.length; i++) particles[i].draw(context, image); for (i = 0; i < firstFree; i++) particles[i].draw(context, image); } }; return ParticlePool; })(); /* * Putting it all together */ (function(canvas) { var context = canvas.getContext('2d'), particles = new ParticlePool(settings.particles.length), particleRate = settings.particles.length / settings.particles.duration, // particles/sec time; // get point on heart with -PI <= t <= PI function pointOnHeart(t) { return new Point( 160 * Math.pow(Math.sin(t), 3), 130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25 ); } // creating the particle image using a dummy canvas var image = (function() { var canvas = document.createElement('canvas'), context = canvas.getContext('2d'); canvas.width = settings.particles.size; canvas.height = settings.particles.size; // helper function to create the path function to(t) { var point = pointOnHeart(t); point.x = settings.particles.size / 2 + point.x * settings.particles.size / 650; point.y = settings.particles.size / 2 - point.y * settings.particles.size / 650; return point; } // create the path context.beginPath(); var t = -Math.PI; var point = to(t); context.moveTo(point.x, point.y); while (t < Math.PI) { t += 0.01; // baby steps! point = to(t); context.lineTo(point.x, point.y); } context.closePath(); // create the fill context.fillStyle = '#ea80b0'; context.fill(); // create the image var image = new Image(); image.src = canvas.toDataURL(); return image; })(); // render that thing! function render() { // next animation frame requestAnimationFrame(render); // update time var newTime = new Date().getTime() / 2000, deltaTime = newTime - (time || newTime); time = newTime; // clear canvas context.clearRect(0, 0, canvas.width, canvas.height); // create new particles var amount = particleRate * deltaTime; for (var i = 0; i < amount; i++) { var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random()); var dir = pos.clone().length(settings.particles.velocity); particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y); } // update and draw particles particles.update(deltaTime); particles.draw(context, image); } // handle (re-)sizing of the canvas function onResize() { canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight; } window.onresize = onResize; // delay rendering bootstrap setTimeout(function() { onResize(); render(); }, 10); })(document.getElementById('pinkboard'));