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// handle circular queue
firstFree++;
if (firstFree   == particles.length) firstFree   = 0;
if (firstActive == firstFree       ) firstActive++;
if (firstActive == particles.length) firstActive = 0;

}; ParticlePool.prototype.update = function(deltaTime) { var i;

// update active particles
if (firstActive < firstFree) {
  for (i = firstActive; i < firstFree; i++)
    particles[i].update(deltaTime);
}
if (firstFree < firstActive) {
  for (i = firstActive; i < particles.length; i++)
    particles[i].update(deltaTime);
  for (i = 0; i < firstFree; i++)
    particles[i].update(deltaTime);
}

// remove inactive particles
while (particles[firstActive].age >= 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 / 350; point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350; 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 = '#FF5CA4'; 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() / 1000,
    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')); </script>