Rectangle Offset

class Example extends Phaser.Scene
{
    create ()
    {
        const graphics = this.add.graphics({ lineStyle: { width: 2, color: 0x0000aa } });

        const rect = new Phaser.Geom.Rectangle(0, 290, 20, 20);

        for (let angle = 0; rect.x < 800; angle += Math.PI / 18)
        {

            graphics.strokeRectShape(rect);

            Phaser.Geom.Rectangle.Offset(rect, 20, Math.cos(angle) * 40);
        }
    }
}

const config = {
    scale: { mode: Phaser.Scale.FIT },
    width: 800,
    height: 600,
    type: Phaser.AUTO,
    parent: 'game-container',
    scene: Example
};

const game = new Phaser.Game(config);