Add PlotList class

lib/daru/view.rb

@@ -1,5 +1,6 @@
 require 'daru/view/version'
 require 'daru/view/plot'
+require 'daru/view/plot_list'
 require 'daru/view/adapters/highcharts/display'
 require 'daru/view/adapters/nyaplot/display'
 require 'daru/view/adapters/googlecharts/display'
@@ -18,6 +19,7 @@ module View
     # default Nyaplot library is used.
     @plotting_library = :nyaplot
     Daru::View::Plot.adapter = @plotting_library
+    Daru::View::PlotList.adapter = @plotting_library
 
     class << self
       attr_reader :plotting_library, :table_library
@@ -28,7 +30,7 @@ def plotting_library=(lib)
         when :nyaplot, :highcharts, :googlecharts
           # plot charts
           @plotting_library = lib
-          Daru::View::Plot.adapter = lib
+          Daru::View::Plot.adapter = Daru::View::PlotList.adapter = lib
           if lib == :googlecharts
             # plot table drawing
             Daru::View::Table.adapter = lib
@@ -53,6 +55,7 @@ def table_library=(lib)
           # plot chart and table drawing
           @plotting_library = @table_library = lib
           Daru::View::Plot.adapter = Daru::View::Table.adapter = lib
+          Daru::View::PlotList.adapter = lib
         when :datatables
           # only for table drawing
           @table_library = Daru::View::Table.adapter = lib

lib/daru/view/plot_list.rb

@@ -0,0 +1,95 @@
+module Daru
+  module View
+    class PlotList
+      attr_reader :charts, :data
+      attr_accessor :adapter
+      class << self
+        # class method
+        #
+        # @example
+        #
+        # Daru::View::PlotList.adapter = :googlecharts
+        #
+        # Plotting libraries are nyaplot, highcharts, googlecharts
+        def adapter=(adapter)
+          require "daru/view/adapters/#{adapter}"
+          # rubocop:disable Style/ClassVars
+          @@adapter = Daru::View::Adapter.const_get(
+            adapter.to_s.capitalize + 'Adapter'
+          )
+          # rubocop:enable Style/ClassVars
+        end
+      end
+
+      # @example
+      #
+      # Daru::View.plotting_library = :googlecharts
+      #
+      # df = Daru::DataFrame.new({a:['A', 'B', 'C', 'D', 'E'], b:[10,20,30,40,50]})
+      # plot1 = Daru::View::Plot.new(
+      #   df, type: :bar, x: :a, y: :b
+      # )
+      # plot2 = Daru::View::Plot.new(
+      #   df, type: :column, x: :a, y: :b
+      # )
+      # plots = Daru::View::PlotList.new([plot1, plot2])
+      #
+      def initialize(data=[])
+        @data = data
+        @charts = plot_data(data)
+      end
+
+      # instance method
+      def adapter=(adapter)
+        require "daru/view/adapters/#{adapter}"
+        @adapter = Daru::View::Adapter.const_get(
+          adapter.to_s.capitalize + 'Adapter'
+        )
+      end
+
+      # display in IRuby notebook
+      def show_in_iruby
+        @adapter.show_in_iruby @charts
+      end
+
+      # dependent js file, to include in head tag using the plot object.
+      # @example:
+      # plot_obj.init_script
+      #
+      # Note :
+      # User can directly put the dependent script file into the head tag
+      # using `Daru::View.dependent_script(:highcharts), by default it loads
+      # Nyaplot JS files.
+      #
+      def init_script
+        @adapter.init_script
+      end
+
+      # generat html code, to include in body tag
+      def div
+        @adapter.generate_body(@charts)
+      end
+
+      # generat html file
+      def export_html_file(path='./plot.html')
+        @adapter.export_html_file(@charts, path)
+      end
+
+      # load the corresponding JS files in IRuby notebook.
+      # This is done automatically when plotting library is set using
+      # Daru::View.plotting_library = :new_library
+      def init_iruby
+        @adapter.init_iruby
+      end
+
+      private
+
+      def plot_data(data)
+        # class variable @@aapter is used in instance variable @adapter.
+        # so in each object `adapter` variable can be accessed.
+        @adapter ||= @@adapter
+        @adapter.init(data)
+      end
+    end
+  end
+end

spec/adapters/googlecharts/display_spec.rb

@@ -30,7 +30,7 @@
   let(:column_chart_chart) {Daru::View::Plot.
   new(data_table.table, column_chart_options)}
   let(:combined) {
-    Daru::View::Plot.new([data_table, area_chart_chart, column_chart_chart])
+    Daru::View::PlotList.new([data_table, area_chart_chart, column_chart_chart])
   }
 
   describe "#to_html" do
@@ -84,7 +84,7 @@
         /data_table.addRow\(\[\{v: \"2013\"\}\]\);/i)
     end
     it "generates valid js of the combined charts" do
-      js = combined.chart.to_html
+      js = combined.charts.to_html
       expect(js).to match(/google.visualization.Table/)
       expect(js).to match(/google.visualization.AreaChart/)
       expect(js).to match(/google.visualization.ColumnChart/)
@@ -93,13 +93,13 @@
 
   describe "#extract_multiple_charts_id_script_path" do
     it "returns correct path of the multiple_charts_div" do
-      id_script_path = combined.chart.extract_multiple_charts_id_script_path
+      id_script_path = combined.charts.extract_multiple_charts_id_script_path
       expect(id_script_path[2]).to match(
         /templates\/googlecharts\/multiple_charts_div.erb/
       )
     end
     it "returns correct scripts of the multiple charts" do
-      id_script_path = combined.chart.extract_multiple_charts_id_script_path
+      id_script_path = combined.charts.extract_multiple_charts_id_script_path
       expect(id_script_path[1][0]).to match(/google.visualization.Table/)
       expect(id_script_path[1][1]).to match(/google.visualization.AreaChart/)
       expect(id_script_path[1][2]).to match(/google.visualization.ColumnChart/)

spec/adapters/googlecharts_spec.rb

@@ -68,7 +68,7 @@
   let(:column_chart_chart) {Daru::View::Plot.
   new(data_table.table, column_chart_options)}
   let(:combined) {
-    Daru::View::Plot.new([data_table, area_chart_chart, column_chart_chart])
+    Daru::View::PlotList.new([data_table, area_chart_chart, column_chart_chart])
   }
 
   describe "initialization Charts" do
@@ -211,7 +211,7 @@
       expect(js).to match(/chart.draw\(data_table, \{width: 800\}/i)
     end
     it "generates valid js of the combined charts" do
-      js = combined.adapter.generate_body(combined.chart)
+      js = combined.adapter.generate_body(combined.charts)
       expect(js).to match(/google.visualization.Table/)
       expect(js).to match(/google.visualization.AreaChart/)
       expect(js).to match(/google.visualization.ColumnChart/)