CustomArrow

var arrows = [];
var Arrow = Particles.registerParticleType({
    texture: "arrow",
    size: [1, 1],
    lifetime: [1, 5],
    velocity: [0, 0, 0]
});
var emitter = new Particles.ParticleEmitter(0, 0, 0);
function CustomArrow() {
    this.spawn = function (params) {
        var lookAngle = Entity.getLookAngle(Player.get());
        if (lookAngle.yaw == 0) { this.spawn(params); return; }
        var c = Entity.getPosition(Player.get()),
            v = McMath.lookDirection(lookAngle.yaw, lookAngle.pitch);
        entity = Entity.spawn(c.x + (v.x * 1.2), c.y + (v.y * 0.8), c.z + (v.z * 1.2), 80);
        Entity.setSkin(entity, params.skin);
        Entity.setVelocity(entity, v.x * params.speed, v.y * params.speed + 0.2, v.z * params.speed);
        Bows.addBullet({ "entity": entity, damage: params.damage });
        this.entity = entity;
        return entity;
        // this.p = Entity.getPosition(this.entity);
        // this.v = Entity.getVelocity(this.entity);
    }

    this.tick = function () {
        this.p = Entity.getPosition(this.entity);
        this.v = Entity.getVelocity(this.entity);
        if(this.v.y!=0){
            this.animate();
        }
    }

    this.animate = function () {
        for (let i = -0.99; i < 0.99; i += 0.33) {
            var c = {
                x: this.p.x - (this.v.x * i),
                y: this.p.y - (this.v.y * i),
                z: this.p.z - (this.v.z * i)
            };
            emitter.emit(Arrow, 0, c.x, c.y, c.z);
        }
    }
}

Callback.addCallback("tick", function () {
    for (var i in arrows) Test(function() {
        if(arrows[i].p.y!=0)
            arrows[i].tick();
        else
        delete arrows[i];
    }, 'ParticleTick')
});