docs: function(r1, c1, r2, c2) {
          var range = {};
          if (r1 < r2) {
              range.top = r1;
              range.height = r2 - r1 + 1;
          } else {
              range.top = r2;
              range.height = r1 - r2 + 1;
          }
  
          if (c1 < c2) {
              range.left = c1;
              range.width = c2 - c1 + 1;
          } else {
              range.left = c2;
              range.width = c1 - c2 + 1;
          }
          return range;
      }