iterations_helper.rb in branston-0.4.1

- old
+ new

@@ -1,2 +1,40 @@
 module IterationsHelper
+
+  # TODO: Untested!
+  #
+  def burndown_chart(iteration, data)
+
+    total_points = 0
+    points_data = []
+
+    unless data.nil? or data.empty?
+      total_points = data[0].total_points.to_i
+      points_data = data.collect{|d| d.points.to_i}
+    end
+
+    work_days = []
+    (iteration.start_date.to_date..iteration.end_date.to_date).to_a.each do |date|
+      work_days.push date.strftime('%d/%m') unless date.wday == 0 or date.wday == 6
+    end
+
+    # Keep adding the last value to flatline the chart
+    while work_days.length > data.length
+      data.push data[data.length - 1]
+    end
+
+    # Make some gradations for the y axis labels
+    y_scale = [0]
+    [4, 2, 1.5, 1.25, 1].each do |n|
+      unit = (total_points / n).floor
+      y_scale.push unit if unit > 0
+    end
+
+    image_tag Gchart.line(:size => '500x300',
+            :title => "#{iteration.name} burndown",
+            :data => points_data, :axis_with_labels => 'x,y',
+            :axis_labels => [work_days, y_scale])
+
+  end
+
 end
+