#113 implement data labels for pie charts

4 files changed, 73 insertions, 1 deletions

diff --git a/lib/axlsx/drawing/chart.rb b/lib/axlsx/drawing/chart.rb
index 3047fec2..c99d4878 100644
--- a/lib/axlsx/drawing/chart.rb
+++ b/lib/axlsx/drawing/chart.rb
@@ -46,7 +46,9 @@ module Axlsx
     attr_reader :series_type
 
     #TODO data labels!
-    #attr_reader :dLabls
+    def d_lbls
+      @d_lbls ||= DLbls.new
+    end
 
     # The title object for the chart.
     # @return [Title]
diff --git a/lib/axlsx/drawing/d_lbls.rb b/lib/axlsx/drawing/d_lbls.rb
new file mode 100644
index 00000000..b1c010f1
--- /dev/null
+++ b/lib/axlsx/drawing/d_lbls.rb
@@ -0,0 +1,67 @@
+module Axlsx
+  #       <c:dLbls>
+  #<c:dLblPos val="outEnd"/>
+  #<c:showLegendKey val="0"/>
+  #<c:showVal val="0"/>
+  #<c:showCatName val="1"/>
+  #<c:showSerName val="0"/>
+  #<c:showPercent val="1"/>
+  #<c:showBubbleSize val="0"/>
+  #<c:showLeaderLines val="1"/>
+  #</c:dLbls>
+
+  #The DLbls class manages serialization of data labels
+  class DLbls
+    BOOLEAN_ATTRIBUTES = [:show_legend_key, :show_val, :show_cat_name, :show_ser_name, :show_percent, :show_bubble_size, :show_leader_lines]
+    
+    # creates a new DLbls object
+    def initialize(options={})
+      d_lbl_pos = :best_fit
+      initialize_defaults
+      options.each do |o|
+        self.send("#{o[0]}=", o[1]) if self.respond_to? "#{o[0]}="
+      end
+
+    end
+    
+    def initialize_defaults
+      BOOLEAN_ATTRIBUTES.each do |attr|
+        self.send("#{attr}=", false)
+      end
+    end
+
+    attr_reader :d_lbl_pos
+
+    # @see DLbls#d_lbl_pos
+    # Assigns the label postion for this data labels on this chart.
+    # Allowed positions are :bestFilt, :b, :ctr, :inBase, :inEnd, :l,
+    # :outEnd, :r and :t
+    # The default is :best_fit
+    # @param [Symbol] label_postion the postion you want to use.
+    def d_lbl_pos=(label_position)
+      Axlsx::RestrictionValidator.validate 'DLbls#d_lbl_pos',  [:bestFit, :b, :ctr, :inBase, :inEnd, :l, :outEnd, :r, :t], label_position
+      @d_lbl_pos = label_position
+    end
+   
+    BOOLEAN_ATTRIBUTES.each do |attr|    
+      class_eval %{
+      attr_reader :#{attr} 
+
+      def #{attr}=(v)
+        Axlsx::validate_boolean(v)
+        @#{attr} = v
+      end
+      }
+    end
+
+
+    # serializes the data labels
+    # @return [String]
+    def to_xml_string(str = '')
+      str << '<c:dLbls>'
+      instance_values.each { |name, value| str << "<c:#{Axlsx::camel(name, false)} val='#{value}' />" }
+      str << '</c:dLbls>'
+    end
+  end
+end
+
diff --git a/lib/axlsx/drawing/drawing.rb b/lib/axlsx/drawing/drawing.rb
index c1b41503..48b9320f 100644
--- a/lib/axlsx/drawing/drawing.rb
+++ b/lib/axlsx/drawing/drawing.rb
@@ -1,5 +1,6 @@
 # encoding: UTF-8
 module Axlsx
+  require 'axlsx/drawing/d_lbls.rb'
   require 'axlsx/drawing/title.rb'
   require 'axlsx/drawing/series_title.rb'
   require 'axlsx/drawing/series.rb'
diff --git a/lib/axlsx/drawing/pie_3D_chart.rb b/lib/axlsx/drawing/pie_3D_chart.rb
index 20e8cd62..059d4148 100644
--- a/lib/axlsx/drawing/pie_3D_chart.rb
+++ b/lib/axlsx/drawing/pie_3D_chart.rb
@@ -26,6 +26,7 @@ module Axlsx
       super(frame, options)
       @series_type = PieSeries
       @view_3D = View3D.new({:rot_x =>30, :perspective=>30}.merge(options))
+      @d_lbls = nil
     end
 
     # Serializes the object
@@ -36,6 +37,7 @@ module Axlsx
         str_inner << '<c:pie3DChart>'
         str_inner << '<c:varyColors val="1"/>'
         @series.each { |ser| ser.to_xml_string(str_inner) }
+        @d_lbls.to_xml_string(str) if @d_lbls
         str_inner << '</c:pie3DChart>'
       end
     end