Added the Gruff library to the lib/ directory of the the rails folder, and the

[selectricity] / lib / gruff-0.2.8 / lib / gruff / stacked_bar.rb

diff --git a/lib/gruff-0.2.8/lib/gruff/stacked_bar.rb b/lib/gruff-0.2.8/lib/gruff/stacked_bar.rb
new file mode 100644 (file)
index 0000000..bf28df7
--- /dev/null
+++ b/lib/gruff-0.2.8/lib/gruff/stacked_bar.rb
@@ -0,0 +1,49 @@
+
+require File.dirname(__FILE__) + '/base'
+
+class Gruff::StackedBar < Gruff::Base
+
+    # Draws a bar graph, but multiple sets are stacked on top of each other.
+    def draw
+      get_maximum_by_stack
+      super
+      return unless @has_data
+
+      # Setup spacing.
+      #
+      # Columns sit stacked.
+      spacing_factor = 0.9
+      @bar_width = @graph_width / @column_count.to_f
+    
+      @d = @d.stroke_opacity 0.0
+      
+      height = Array.new(@column_count, 0)
+    
+      @norm_data.each_with_index do |data_row, row_index|
+        @d = @d.fill data_row[DATA_COLOR_INDEX]
+      
+        data_row[1].each_with_index do |data_point, point_index|
+          # Use incremented x and scaled y
+          left_x = @graph_left + (@bar_width * point_index)
+          left_y = @graph_top + (@graph_height -
+                                 data_point * @graph_height - 
+                                 height[point_index]) + 1
+          right_x = left_x + @bar_width * spacing_factor
+          right_y = @graph_top + @graph_height - height[point_index] - 1
+          
+          # update the total height of the current stacked bar
+          height[point_index] += (data_point * @graph_height - 2)
+          
+          @d = @d.rectangle(left_x, left_y, right_x, right_y)
+          
+          # Calculate center based on bar_width and current row
+          label_center = @graph_left + (@bar_width * point_index) + (@bar_width * spacing_factor / 2.0)
+          draw_label(label_center, point_index)
+        end
+
+      end
+    
+      @d.draw(@base_image)    
+    end
+
+end