drawRing(x, y, s) {
    let circleElem = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
    let radius = MathHelper.apothemFromSideLength(this.opts.bondLength, s);
    circleElem.setAttributeNS(null, 'cx', x);
    circleElem.setAttributeNS(null, 'cy', y);
    circleElem.setAttributeNS(null, 'r', radius - this.opts.bondSpacing);
    circleElem.setAttributeNS(null, 'stroke', this.themeManager.getColor('C'));
    circleElem.setAttributeNS(null, 'stroke-width', this.opts.bondThickness);
    circleElem.setAttributeNS(null, 'fill', 'none');
    this.paths.push(circleElem);
  }
Draws a ring.

@param {x} x The x coordinate of the ring.
@param {y} r The y coordinate of the ring.
@param {s} s The size of the ring.