drawquadrants(context) {
        if (this.nw != null) {
            this.nw.drawquadrants(context);
            this.ne.drawquadrants(context);
            this.sw.drawquadrants(context);
            this.se.drawquadrants(context);
        } else {
            context.beginPath();
            context.rect(this.boundaryAABB.x - this.boundaryAABB.halfLength,
                         this.boundaryAABB.y - this.boundaryAABB.halfLength,
                         2 * this.boundaryAABB.halfLength, 2 * this.boundaryAABB.halfLength);
            context.lineWidth = 3;
            context.strokeStyle = 'black';
            context.closePath();
            context.stroke();
        }
    }