code: function() {
                  var pMatrix = this.parent ? this.parent.getLayoutTransform() : new kity.Matrix();
                  var matrix = this.getLayoutTransform();
                  var offset = this.getLayoutOffset();
                  if (offset) {
                      matrix = matrix.clone().translate(offset.x, offset.y);
                  }
                  return pMatrix.merge(matrix);
              }
docs: 第一轮布局计算后，获得的全局布局位置
  
  @return {[type]} [description]