Can configure a pivot table when creating it

see examples/pivot_table.rb

    wb.add_worksheet(:name => "Data Sheet") do |sheet|
      sheet.add_row ['Month', 'Year', 'Type', 'Sales', 'Region']
      30.times { sheet.add_row [month, year, type, sales, region] }
      sheet.add_pivot_table 'G4:L17', "A1:E31" do |pivot_table|
        pivot_table.rows = ['Month', 'Year']
        pivot_table.columns = ['Type']
        pivot_table.data = ['Sales']
        pivot_table.pages = ['Region']
      end
    end

1 files changed, 134 insertions, 6 deletions

diff --git a/lib/axlsx/workbook/worksheet/pivot_table.rb b/lib/axlsx/workbook/worksheet/pivot_table.rb
index c4eff8be..d876f777 100644
--- a/lib/axlsx/workbook/worksheet/pivot_table.rb
+++ b/lib/axlsx/workbook/worksheet/pivot_table.rb
@@ -19,6 +19,10 @@ module Axlsx
       @sheet = sheet
       @sheet.workbook.pivot_tables << self
       @name = "PivotTable#{index+1}"
+      @rows = []
+      @columns = []
+      @data = []
+      @pages = []
       parse_options options
       yield self if block_given?
     end
@@ -46,6 +50,54 @@ module Axlsx
       end
     end
 
+    # The rows
+    # @return [Array]
+    attr_reader :rows
+
+    def rows=(v)
+      DataTypeValidator.validate "#{self.class}.rows", [Array], v
+      v.each do |ref|
+        DataTypeValidator.validate "#{self.class}.rows[]", [String], ref
+      end
+      @rows = v
+    end
+
+    # The columns
+    # @return [Array]
+    attr_reader :columns
+
+    def columns=(v)
+      DataTypeValidator.validate "#{self.class}.columns", [Array], v
+      v.each do |ref|
+        DataTypeValidator.validate "#{self.class}.columns[]", [String], ref
+      end
+      @columns = v
+    end
+
+    # The data
+    # @return [Array]
+    attr_reader :data
+
+    def data=(v)
+      DataTypeValidator.validate "#{self.class}.data", [Array], v
+      v.each do |ref|
+        DataTypeValidator.validate "#{self.class}.data[]", [String], ref
+      end
+      @data = v
+    end
+
+    # The pages
+    # @return [String]
+    attr_reader :pages
+
+    def pages=(v)
+      DataTypeValidator.validate "#{self.class}.pages", [Array], v
+      v.each do |ref|
+        DataTypeValidator.validate "#{self.class}.pages[]", [String], ref
+      end
+      @pages = v
+    end
+
     # The index of this chart in the workbooks charts collection
     # @return [Integer]
     def index
@@ -102,19 +154,95 @@ module Axlsx
       str << '<pivotTableDefinition xmlns="' << XML_NS << '" name="' << name << '" cacheId="' << cache_definition.cache_id.to_s << '"  dataOnRows="1" applyNumberFormats="0" applyBorderFormats="0" applyFontFormats="0" applyPatternFormats="0" applyAlignmentFormats="0" applyWidthHeightFormats="1" dataCaption="Data" showMultipleLabel="0" showMemberPropertyTips="0" useAutoFormatting="1" indent="0" compact="0" compactData="0" gridDropZones="1" multipleFieldFilters="0">'
       str <<   '<location firstDataCol="1" firstDataRow="1" firstHeaderRow="1" ref="' << ref << '"/>'
       str <<   '<pivotFields count="' << header_cells_count.to_s << '">'
-      header_cells_count.times do
-        str <<   '<pivotField compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1"/>'
+      header_cell_values.each do |cell_value|
+        str <<   pivot_field_for(cell_value)
       end
       str <<   '</pivotFields>'
+      if rows.empty?
+        str << '<rowFields count="1"><field x="-2"/></rowFields>'
+        str << '<rowItems count="2"><i><x/></i> <i i="1"><x v="1"/></i></rowItems>'
+      else
+        str << '<rowFields count="' << rows.size.to_s << '">'
+        rows.each do |row_value|
+          str << '<field x="' << header_index_of(row_value).to_s << '"/>'
+        end
+        str << '</rowFields>'
+        str << '<rowItems count="' << rows.size.to_s << '">'
+        rows.size.times do |i|
+          str << '<i/>'
+        end
+        str << '</rowItems>'
+      end
+      if columns.empty?
+        str << '<colItems count="1"><i/></colItems>'
+      else
+        str << '<colFields count="' << columns.size.to_s << '">'
+        columns.each do |column_value|
+          str << '<field x="' << header_index_of(column_value).to_s << '"/>'
+        end
+        str << '</colFields>'
+      end
+      unless pages.empty?
+        str << '<pageFields count="' << pages.size.to_s << '">'
+        pages.each do |page_value|
+          str << '<pageField fld="' << header_index_of(page_value).to_s << '"/>'
+        end
+        str << '</pageFields>'
+      end
+      unless data.empty?
+        str << '<dataFields count="' << data.size.to_s << '">'
+        data.each do |datum_value|
+          str << '<dataField name="Sum of ' << datum_value << '" ' <<
+                            'fld="' << header_index_of(datum_value).to_s << '" ' <<
+                            'baseField="0" baseItem="0"/>'
+        end
+        str << '</dataFields>'
+      end
       str << '</pivotTableDefinition>'
     end
 
-    private
+    def header_cell_refs
+      Axlsx::range_to_a(header_range).first
+    end
 
-    # get the header cells (hackish)
     def header_cells
-      header = range.gsub(/^(\w+?)(\d+)\:(\w+?)\d+$/, '\1\2:\3\2')
-      @sheet[header]
+      @sheet[header_range]
+    end
+
+    def header_cell_values
+      header_cells.map(&:value)
+    end
+
+    def header_index_of(value)
+      header_cell_values.index(value)
+    end
+
+    private
+
+    def pivot_field_for(cell_ref)
+      if rows.include? cell_ref
+        '<pivotField axis="axisRow" compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1">' <<
+          '<items count="1"><item t="default"/></items>' <<
+        '</pivotField>'
+      elsif columns.include? cell_ref
+        '<pivotField axis="axisCol" compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1">' <<
+          '<items count="1"><item t="default"/></items>' <<
+        '</pivotField>'
+      elsif pages.include? cell_ref
+        '<pivotField axis="axisCol" compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1">' <<
+          '<items count="1"><item t="default"/></items>' <<
+        '</pivotField>'
+      elsif data.include? cell_ref
+        '<pivotField dataField="1" compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1">' <<
+        '</pivotField>'
+      else
+        '<pivotField compact="0" outline="0" subtotalTop="0" showAll="0" includeNewItemsInFilter="1">' <<
+        '</pivotField>'
+      end
+    end
+
+    def header_range
+      range.gsub(/^(\w+?)(\d+)\:(\w+?)\d+$/, '\1\2:\3\2')
     end
 
   end