code: function(par, ch, coord, prop) {
       //compute children real areas
        var parentArea = coord.width * coord.height;
        var i, l=ch.length, totalChArea=0, chArea = [];
        for(i=0; i<l; i++) {
          chArea[i] = +ch[i].getData('area', prop);
          totalChArea += chArea[i];
        }
        for(i=0; i<l; i++) {
          ch[i]._area = parentArea * chArea[i] / totalChArea;
        }
       var side = this.layout.horizontal()? coord.width : coord.height;
       var initElem = [ch[0]];
       var tail = ch.slice(1);
       this.stripify(tail, initElem, side, coord, prop);
      }
docs: /*
  Method: processChildrenLayout
  
  Computes children real areas and other useful parameters for performing the Strip algorithm.
  
  Parameters:
  
  par - The parent node of the json subtree.
  ch - An Array of nodes
  coord - A coordinates object specifying width, height, left and top style properties.