progress on scatter chart but no cigar

lib/seer/scatter_chart.rb

@@ -0,0 +1,126 @@
+module Seer
+
+  # =USAGE
+  # 
+  # In your controller:
+  #
+  #   @weights = Weights.all # Must be an array, and must respond
+  #                       # to the x and y data methods specified below
+  #
+  # In your view:
+  #
+  #   <div id="chart"></div>
+  #
+  #   <%= Seer::visualize(
+  #         @widgets, 
+  #         :as => :scatter_chart,
+  #         :in_element => 'chart',
+  #         :series => {:x_method => 'age', :y_method => 'weight'},
+  #         :chart_options => {
+  #           :height => 300,
+  #           :width => 200 * @weights.size,
+  #           :legend => 'none',
+  #           :colors => ["#990000"],
+  #           :title => "Weights by Age",
+  #           :title_x => 'Age',
+  #           :title_y => 'Weight'
+  #         }
+  #       )
+  #    -%>
+  #   
+  #
+  # For details on the chart options, see the Google API docs at 
+  # http://code.google.com/apis/visualization/documentation/gallery/scatterchart.html
+  #
+  class ScatterChart
+
+    include Seer::Chart
+
+    # Chart options accessors
+    attr_accessor :axis_color, :axis_background_color, :axis_font_size, :background_color, :border_color, :data_table, :enable_tooltip, :focus_border_color, :height, :is_3_d, :is_stacked, :legend, :legend_background_color, :legend_font_size, :legend_text_color, :log_scale, :max, :min, :reverse_axis, :show_categories, :title, :title_x, :title_y, :title_color, :title_font_size, :tooltip_font_size, :tooltip_height, :tooltip_width, :width
+
+    # Graph data
+    attr_accessor :data, :x_method, :y_method
+
+    def initialize(args={}) #:nodoc:
+
+      # Standard options
+      args.each{ |method,arg| self.send("#{method}=",arg) if self.respond_to?(method) }
+
+      # Chart options
+      args[:chart_options].each{ |method, arg| self.send("#{method}=",arg) if self.respond_to?(method) }
+
+      # Handle defaults      
+      @colors ||= args[:chart_options][:colors] || DEFAULT_COLORS
+      @legend ||= args[:chart_options][:legend] || DEFAULT_LEGEND_LOCATION
+      @height ||= args[:chart_options][:height] || DEFAULT_HEIGHT
+      @width  ||= args[:chart_options][:width]  || DEFAULT_WIDTH
+      @is_3_d ||= args[:chart_options][:is_3_d]
+
+      @data_table = []
+
+    end
+
+    def data_columns
+      _data_columns =  "            data.addRows(#{data_table.size});\r"
+      _data_columns << "            data.addColumn('number', '#{x_method}');\r"
+      _data_columns << "            data.addColumn('number', '#{y_method}');\r"
+      _data_columns
+    end
+
+    def data_table #:nodoc:
+      data.each_with_index do |datum, column|
+        @data_table << [
+          "            data.setValue(#{column}, 0,'#{datum.send(x_method)}');\r",
+          "            data.setValue(#{column}, 1, #{datum.send(y_method)});\r"
+        ]
+      end
+      @data_table
+    end
+
+    def is_3_d #:nodoc:
+      @is_3_d.blank? ? false : @is_3_d
+    end
+
+    def nonstring_options #:nodoc:
+      [:axis_font_size, :colors, :enable_tooltip, :is_3_d, :is_stacked, :legend_font_size, :log_scale, :max, :min, :reverse_axis, :show_categories, :title_font_size, :tooltip_font_size, :tooltip_width]
+    end
+
+    def string_options #:nodoc:
+      [:axis_color, :axis_background_color, :background_color, :border_color, :focus_border_color,  :height, :legend, :legend_background_color, :legend_text_color, :title, :title_x, :title_y, :title_color, :width]
+    end
+
+    def to_js #:nodoc:
+
+      %{
+        <script type="text/javascript">
+          google.load('visualization', '1', {'packages':['scatterchart']});
+          google.setOnLoadCallback(drawChart);
+          function drawChart() {
+            var data = new google.visualization.DataTable();
+#{data_columns}
+#{data_table.to_s}
+            var options = {};
+#{options}
+            var container = document.getElementById('#{self.chart_element}');
+            var chart = new google.visualization.ScatterChart(container);
+            chart.draw(data, options);
+          }
+        </script>
+      }
+    end
+
+    def self.render(data, args) #:nodoc:
+      graph = Seer::ScatterChart.new(
+        :x_method       => args[:series][:x_method],
+        :y_method       => args[:series][:y_method],
+        :chart_options  => args[:chart_options],
+        :chart_element  => args[:in_element] || 'chart',
+        :data           => data
+      )
+      graph.to_js
+    end
+
+  end  
+
+end