@smoud/tiny/examples/js/particles/Smoke.js

Fast and tiny JavaScript library for HTML5 game and playable ads creation.

Tiny.SmokeParticle = function (emitter) {
    Tiny.Particle.call(this, emitter);
};

Tiny.SmokeParticle.prototype = Object.create(Tiny.Particle.prototype);
Tiny.SmokeParticle.prototype.constructor = Tiny.SmokeParticle;

Tiny.SmokeParticle.prototype.update = function (time, delta) {
    this.scale.set(Math.min(time / 1000, 0.7));
    this.alpha = Math.min(time / 1000, 1);

    this.y -= this.yspeed * delta;
    this.x += this.xspeed * delta;
    this.rotation += this.rotationsp;
};

Tiny.SmokeParticle.prototype.onEmit = function () {
    this.xspeed = Tiny.rnd(-4, 4) * 0.05;
    this.yspeed = Tiny.rnd(2, 10) * 0.05;
    this.rotationsp = Math.random() * 0.02 - 0.01;
};

Tiny.SmokeParticle.prototype.draw = function (context, resolution) {
    //context.fillRect(0, 0, 100, 100)

    context.beginPath();
    context.arc(0, 0, 100 * resolution, 0, 2 * Math.PI, false);
    context.fill();
};