code: function (x, y, r) {
              var attr = isObject(x) ?
                  x :
                {
                    x: x,
                    y: y,
                    r: r
                },
                wrapper = this.createElement('circle');
  
              wrapper.xSetter = function (value) {
                  this.element.setAttribute('cx', value);
              };
              wrapper.ySetter = function (value) {
                  this.element.setAttribute('cy', value);
              };
              return wrapper.attr(attr);
          }
docs: Draw and return an SVG circle
  @param {Number} x The x position
  @param {Number} y The y position
  @param {Number} r The radius