Add support for area charts

1 files changed, 99 insertions, 0 deletions

diff --git a/lib/axlsx/drawing/area_chart.rb b/lib/axlsx/drawing/area_chart.rb
new file mode 100644
index 00000000..e58b2cf1
--- /dev/null
+++ b/lib/axlsx/drawing/area_chart.rb
@@ -0,0 +1,99 @@
+# encoding: UTF-8
+module Axlsx
+
+  # The AreaChart is a two dimentional line chart (who would have guessed?) that you can add to your worksheet.
+  # @example Creating a chart
+  #   # This example creates a line in a single sheet.
+  #   require "rubygems" # if that is your preferred way to manage gems!
+  #   require "axlsx"
+  #
+  #   p = Axlsx::Package.new
+  #   ws = p.workbook.add_worksheet
+  #   ws.add_row ["This is a chart with no data in the sheet"]
+  #
+  #   chart = ws.add_chart(Axlsx::AreaChart, :start_at=> [0,1], :end_at=>[0,6], :title=>"Most Popular Pets")
+  #   chart.add_series :data => [1, 9, 10], :labels => ["Slimy Reptiles", "Fuzzy Bunnies", "Rottweiler"]
+  #
+  # @see Worksheet#add_chart
+  # @see Worksheet#add_row
+  # @see Chart#add_series
+  # @see Series
+  # @see Package#serialize
+  class AreaChart < Chart
+
+    # the category axis
+    # @return [CatAxis]
+    def cat_axis
+      axes[:cat_axis]
+    end
+    alias :catAxis :cat_axis
+
+    # the category axis
+    # @return [ValAxis]
+    def val_axis
+      axes[:val_axis]
+    end
+    alias :valAxis :val_axis
+
+     # must be one of  [:percentStacked, :clustered, :standard, :stacked]
+    # @return [Symbol]
+    attr_reader :grouping
+
+    # Creates a new line chart object
+    # @param [GraphicFrame] frame The workbook that owns this chart.
+    # @option options [Cell, String] title
+    # @option options [Boolean] show_legend
+    # @option options [Symbol] grouping
+    # @see Chart
+    def initialize(frame, options={})
+      @vary_colors = false
+      @grouping = :standard
+      super(frame, options)
+      @series_type = LineSeries
+      @d_lbls = nil
+    end
+
+    # @see grouping
+    def grouping=(v)
+      RestrictionValidator.validate "AreaChart.grouping", [:percentStacked, :standard, :stacked], v
+      @grouping = v
+    end
+
+    # The node name to use in serialization. As AreaChart is used as the
+    # base class for Liine3DChart we need to be sure to serialize the
+    # chart based on the actual class type and not a fixed node name.
+    # @return [String]
+    def node_name
+      path = self.class.to_s
+      if i = path.rindex('::')
+        path = path[(i+2)..-1]
+      end
+      path[0] = path[0].chr.downcase
+      path
+    end
+
+    # Serializes the object
+    # @param [String] str
+    # @return [String]
+    def to_xml_string(str = '')
+      super(str) do
+        str << ("<c:" << node_name << ">")
+        str << ('<c:grouping val="' << grouping.to_s << '"/>')
+        str << ('<c:varyColors val="' << vary_colors.to_s << '"/>')
+        @series.each { |ser| ser.to_xml_string(str) }
+        @d_lbls.to_xml_string(str) if @d_lbls
+        yield if block_given?
+        axes.to_xml_string(str, :ids => true)
+        str << ("</c:" << node_name << ">")
+        axes.to_xml_string(str)
+      end
+    end
+
+    # The axes for this chart. AreaCharts have a category and value
+    # axis.
+    # @return [Axes]
+    def axes
+      @axes ||= Axes.new(:cat_axis => CatAxis, :val_axis => ValAxis)
+    end
+  end
+end