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

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

export default class ExplodeParticle extends Tiny.Particle {
    constructor(emitter) {
        super(emitter);
    }

    update(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;
    }

    onEmit() {
        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;
    }

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