docs: function (data, clamp) {
          var point = this.dataToPoint(data, clamp);
  
          return {
              contentShape: {
                  x: point[0] - (this._sw - this._lineWidth) / 2,
                  y: point[1] - (this._sh - this._lineWidth) / 2,
                  width: this._sw - this._lineWidth,
                  height: this._sh - this._lineWidth
              },
  
              center: point,
  
              tl: [
                  point[0] - this._sw / 2,
                  point[1] - this._sh / 2
              ],
  
              tr: [
                  point[0] + this._sw / 2,
                  point[1] - this._sh / 2
              ],
  
              br: [
                  point[0] + this._sw / 2,
                  point[1] + this._sh / 2
              ],
  
              bl: [
                  point[0] - this._sw / 2,
                  point[1] + this._sh / 2
              ]
  
          };
      }