class Clouds extends Particles
{

    constructor(_y, _x, _height, _width)
    {
        super(_y, _x, _height, _width);

        this._sprites = [];
        this._padding = 500;
        this._speed = 0.2;

        for(let i = 0; i < 20; i++)
        {
            let texture = resource.getTexture('cloud.png');
            let sprite = new PIXI.Sprite(texture);

            sprite.anchor.set(0.5);
            sprite.scale.set(0.9 + Math.random() * 0.6);
            sprite.x = engine.utils.random(-this._padding, this._size.width + this._padding);
            sprite.y = engine.utils.random(-this._padding, this._size.height + this._padding);

            this._sprites.push(sprite);
            this._container.addChild(sprite);
        }
    }

    /*
        Update
    */

    update(_DT)
    {
        for(let cloud of this._sprites)
        {
            let speed = Math.floor(this._speed * _DT);
            cloud.x -= speed;
            cloud.y += speed;

            if(cloud.x < this._position.x - this._padding)
                cloud.x = this._size.width + this._padding;

            if(cloud.y > this._size.height + this._padding)
                cloud.y = -this._padding;
        }
    }

}