code: function(parsedAttributes) {
        if (parsedAttributes.left) {
          this.set('left', parsedAttributes.left + this.getWidth() / 2);
        }
        this.set('x', parsedAttributes.left || 0);
        if (parsedAttributes.top) {
          this.set('top', parsedAttributes.top + this.getHeight() / 2);
        }
        this.set('y', parsedAttributes.top || 0);
        return this;
      }
docs: since our coordinate system differs from that of SVG