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

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

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

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

Tiny.ExplodeParticle.prototype.update = function (time, delta) {
    var scale = Math.min(time / 200, 1);
    this.scale.set(scale * scale * scale * scale);
    this.alpha = Math.min(time / 250, 1);

    var speed = scale * scale * scale * scale * 5;

    this.x += this.xspeed * speed;
    this.y += this.yspeed * speed;
};

Tiny.ExplodeParticle.prototype.onEmit = function () {
    var randAgle = Math.random() * Math.PI * 2;

    var rand_speed = Math.random() * 3;

    this.xspeed = Math.sin(randAgle) * rand_speed;
    this.yspeed = Math.cos(randAgle) * rand_speed;

    this.x = this.xspeed * Math.random() * 3;
    this.y = this.yspeed * Math.random() * 3;
};

Tiny.ExplodeParticle.prototype.draw = function (context, resolution) {
    context.beginPath();
    context.arc(0, 0, 20 * resolution, 0, 2 * Math.PI, false);
    context.fill();
};