drawAromaticityRing(ring) {
    let ctx = this.ctx;
    let radius = MathHelper.apothemFromSideLength(this.opts.bondLength, ring.getSize());
    ctx.save();
    ctx.strokeStyle = this.themeManager.getColor('C');
    ctx.lineWidth = this.opts.bondThickness;
    ctx.beginPath();
    ctx.arc(ring.center.x + this.offsetX, ring.center.y + this.offsetY, radius - this.opts.bondSpacing, 0, Math.PI * 2, true);
    ctx.closePath();
    ctx.stroke();
    ctx.restore();
  }
Draws a ring inside a provided ring, indicating aromaticity.

@param {Ring} ring A ring.