referenced mailing list and gitorious

[selectricity] / app / controllers / graph_controller.rb

diff --git a/app/controllers/graph_controller.rb b/app/controllers/graph_controller.rb
index 8a11a42d1d9bfe607161d26056dff706c202c95f..f6dc5d5fc3f32fc2012f6435932503728b49f69f 100644 (file)
--- a/app/controllers/graph_controller.rb
+++ b/app/controllers/graph_controller.rb
@@ -1,23 +1,65 @@
-require 'date'
-class GraphController < ApplicationController
+# Selectricity: Voting Machinery for the Masses
+# Copyright (C) 2007, 2008 Benjamin Mako Hill <mako@atdot.cc>
+# Copyright (C) 2007 Massachusetts Institute of Technology
+#
+# This program is free software. Please see the COPYING file for
+# details.

 
 

+require 'date'
+class GraphController < ApplicationController  

   class GruffGraff
   class GruffGraff

-  
+    
+    COLORS = ['#74CE00', '#005CD9', '#DC0D13', '#131313', '#A214A4', '#EFF80E',
+              '#90E5E6', '#F58313', '#437D3D', '#0E026C']
+    BACKGROUND_COLORS = ['#74CE00', '#FFFFFF'] #for green and white background
+    

     def initialize(options)
     def initialize(options)

-      size = "700x400"
+      size = options[:size] ? options[:size] : "400x300" #allow custom sizing

       @graph = options[:graph_type].new(size)
       @graph = options[:graph_type].new(size)

-
-      @graph.theme = { :background_colors => ['#73BF26', '#ffffff'] }
+      
+      @graph.no_data_message = "No Voters"
+      
+      @graph.theme = { :colors => COLORS,
+                       :background_colors => ['#e5e5e5', '#FFFFFF']  }

       @graph.font = File.expand_path('/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf',
                                    RAILS_ROOT)
       
       @graph.font = File.expand_path('/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf',
                                    RAILS_ROOT)
       

+      if options[:legend_font_size]
+        @graph.legend_font_size = options[:legend_font_size] 
+      end
+      
+      if options[:title_font_size]  
+        @graph.title_font_size = options[:title_font_size]
+      end
+      
+      #marker count doesn't include minimum value line, default is 4
+      @graph.marker_count = options[:marker_count] if options[:marker_count]
+      
+      @graph.marker_font_size = options[:marker_font_size] if options[:marker_font_size]
+      
+      @graph.marker_color = options[:marker_color] if options[:marker_color]
+      

       # fill in the data with the optional data name
       # fill in the data with the optional data name

-      @graph.data( options.fetch(:data_name, nil), options[:data] )
-
+      #Check to see if multiple datasets, if so, fill them all!
+      #Sort by biggest first piece of data.
+      if options[:data].is_a?(Hash) 
+        options[:data].sort {|a,b| b[1][0] <=> a[1][0]}.each do |dataset|
+          @graph.data(dataset[0], dataset[1])
+        end
+      #if each dataset nameless, will have only multiple arrays    
+      elsif options[:data].size > 1 && options[:data].all?  {|i| i.is_a?(Array)}
+        options[:data].each do |array|
+          @graph.data( options.fetch(:data_name, "Data"), array)
+        end
+      else #one dimensional array, just pass it in
+      @graph.data( options.fetch(:data_name, "Data"), options[:data] )
+      @graph.hide_legend = true
+      end
+      

       # set the labels or create an empty hash
       @graph.labels = options[:interval_labels] \
         if options.has_key?(:interval_labels) and \
       # set the labels or create an empty hash
       @graph.labels = options[:interval_labels] \
         if options.has_key?(:interval_labels) and \

-           options[:interval_labels].class = Hash
+           options[:interval_labels].class == Hash

       @graph.x_axis_label = options[:x_axis_label] \
         if options.has_key?(:x_axis_label)
       @graph.y_axis_label = options[:y_axis_label] \
       @graph.x_axis_label = options[:x_axis_label] \
         if options.has_key?(:x_axis_label)
       @graph.y_axis_label = options[:y_axis_label] \


@@ -54,38 +96,147 @@ class GraphController < ApplicationController
     @election = Election.find(params[:id])
     data, labels, scale = get_votes_per_interval_data(@election)
     
     @election = Election.find(params[:id])
     data, labels, scale = get_votes_per_interval_data(@election)
     

+    hide_legend = true
+    

     graph = GruffGraff.new( :graph_type => Gruff::Line,
                             :data_name => @election.name,
                             :data => data,
                             :interval_labels => labels,
                             :title => "Voters Over Time",
     graph = GruffGraff.new( :graph_type => Gruff::Line,
                             :data_name => @election.name,
                             :data => data,
                             :interval_labels => labels,
                             :title => "Voters Over Time",

+                            :size => "330x232", 
+                            :legend_font_size => 40,
+                            :title_font_size => 50,
+                            :marker_count => 2,
+                            :marker_font_size => 30,
+                            :marker_color => '#999999',

                             :x_axis_label => scale,
                             :y_axis_label => "Number of Votes")
     send_data(*graph.output)
   end
                             :x_axis_label => scale,
                             :y_axis_label => "Number of Votes")
     send_data(*graph.output)
   end

- 
-  def quickvote_bar
-    @election = Election.find(params[:id])
-  end

   
   def borda_bar
     @election = Election.find(params[:id])
   
   def borda_bar
     @election = Election.find(params[:id])

-    pref_tally = make_preference_tally(@election)
+    @election.results unless @election.borda_result
+    data, labels = get_borda_points(@election.borda_result)

     
     

-    @borda_result = BordaVote.new(pref_tally).result
-    data, labels = get_borda_points(@borda_result)
+    size = "400x300"
+    size = "580x300" if @election.candidates.size >= 5
+    
+   if @election.candidates.size >= 5
+     marker_font_size = 17
+   else
+     marker_font_size = 20
+   end

     
     graph = GruffGraff.new( :graph_type => Gruff::Bar,
                             :data_name => @election.name,
                             :data => data,
                             :interval_labels => labels,
     
     graph = GruffGraff.new( :graph_type => Gruff::Bar,
                             :data_name => @election.name,
                             :data => data,
                             :interval_labels => labels,

+                            :size => size,

                             :title => "Points Per Candidate",
                             :title => "Points Per Candidate",

+                            :marker_color => '#999999',
+                            :marker_font_size => marker_font_size,

                             :y_axis_label => "Points",
                             :y_axis_label => "Points",

-                            :x_axis_label => "Candidate")
+                            :x_axis_label => "Candidates")

     send_data(*graph.output)
   end
     send_data(*graph.output)
   end

+  #Acording to Tufte, small, concomparitive, highly labeled data sets usually
+  #belong in tables. The following is a bar graph...but would it be better
+  #as a table?
+  def choices_positions
+    @election = Election.find(params[:id])
+    legend = Hash.new   
+    alldata, labels = get_positions_info(@election)    
+    @election.results unless @election.condorcet_result || @election.ssd_result
+    ranked_candidates = @election.condorcet_result.ranked_candidates.flatten
+    
+    names = Hash.new
+    candidates = @election.candidates.sort.collect {|candidate| candidate.id}
+    candidates.each do |candidate|
+      names[candidate]= (Candidate.find(candidate)).name
+    end
+    
+    ranked_candidates.each_with_index \
+    {|candidate, index| legend[names[candidate]] = alldata[index]}
+    
+    graph = GruffGraff.new( :graph_type => Gruff::Bar,
+                            :data => legend,
+                            :interval_labels => labels,
+                            :title => "Times Voted in Each Position",
+                            :y_axis_label => "Number of Times Ranked",
+                            :x_axis_label => "Rank")
+    send_data(*graph.output) 
+  end
+  
+  def plurality_pie
+    @election = Election.find(params[:id])
+    @election.results unless @election.plurality_result || @election.approval_result
+    votes = @election.votes.size
+    data = Hash.new
+    names = @election.names_by_id
+    
+    @election.plurality_result.points.each do |candidate, votes|
+      data[names[candidate]] = votes
+    end
+    size = "400x300"
+    size = "520x300" if @election.candidates.size >= 8
+
+   if @election.candidates.size >= 8
+     marker_font_size = 20
+     legend_font_size = 17
+   else
+     marker_font_size = 17
+     legend_font_size = 17
+   end

  
  

+    pie = GruffGraff.new( :graph_type => Gruff::Pie,
+                           :title => "Percentage of First Place Votes",
+                           :size => size,
+                           :marker_font_size => marker_font_size,
+                          :legend_font_size => legend_font_size,
+                           :data => data)
+    send_data(*pie.output)
+                           
+  end
+  

  private 
  private 

+  def get_positions_info(election)
+    buckets = Hash.new
+    buckets2= Hash.new
+    rank_labels = Hash.new
+    
+    #attach the ranking to the candidate's array to which is belongs
+    #creating a key if necessary
+    election.votes.each do |vote|
+      vote.rankings.each do |ranking|
+        
+         unless buckets.has_key?(ranking.candidate_id)
+           buckets[ranking.candidate_id] = []
+         end
+        buckets[ranking.candidate_id] << ranking.rank
+        
+      end
+    end
+    
+    #count how many times each candidate has been ranked at a certain level
+    buckets.each_pair do |id, array|
+      (1..election.candidates.size).each do |i|
+        buckets2[id] = [] unless buckets2.has_key?(id)
+        buckets2[id] << (array.find_all {|rank| rank == i}).size
+      end
+    end
+    
+    #sort by amount of 1st place votes
+    sorted_data = buckets2.values.sort {|a,b| b[0] <=> a[0]}
+    
+    election.votes.each do |vote|
+      vote.rankings.size.times do |i|
+        rank_labels[i] = (i+1).to_s
+      end
+    end
+    
+    return sorted_data, rank_labels   
+  end

    
   # generate the data and labels for each graph
   def get_votes_per_day_data(election)
    
   # generate the data and labels for each graph
   def get_votes_per_day_data(election)


@@ -106,7 +257,8 @@ class GraphController < ApplicationController
     
     # Now I need to create an array with all the times votes were made
     election.votes.each do |vote|
     
     # Now I need to create an array with all the times votes were made
     election.votes.each do |vote|

-        voter_days << Date.parse(vote.time.to_s)
+      next unless vote.time
+      voter_days << Date.parse(vote.time.to_s)

     end
     voter_days.sort!
     
     end
     voter_days.sort!
     


@@ -144,14 +296,15 @@ class GraphController < ApplicationController
     
     # Make a hash, buckets, indexed by time intervals and containing empty arrays
     # The time object must come first in addition! 
     
     # Make a hash, buckets, indexed by time intervals and containing empty arrays
     # The time object must come first in addition! 

-    # i would start at 0, i+1 goes from 0 up till numcols
+    # i would start at 0, i+1 goes from 1 up till numcols

     numcols.times {|i| buckets[starttime + ((i+1)*interval_length)] = []}
      
     # Put votes into bucket according to the time interval to which they belong,
     # referenced by their key
     numcols.times {|i| buckets[starttime + ((i+1)*interval_length)] = []}
      
     # Put votes into bucket according to the time interval to which they belong,
     # referenced by their key

-    # Will build a graph over time, as each successive interval wil lhave more
+    # Will build a graph over time, as each successive interval will have more

     # vote objects  
     election.votes.each do |vote|
     # vote objects  
     election.votes.each do |vote|

+      next unless vote.time

       buckets.keys.sort.each do |inter|
         if vote.time < inter
           buckets[inter] << vote
       buckets.keys.sort.each do |inter|
         if vote.time < inter
           buckets[inter] << vote


@@ -164,18 +317,18 @@ class GraphController < ApplicationController
     # Create the hash for the labels. Each graph has ten columns, and three
     # will be labeled
     if timedelta < 2.hours #under two hours use minutes for labels
     # Create the hash for the labels. Each graph has ten columns, and three
     # will be labeled
     if timedelta < 2.hours #under two hours use minutes for labels

-      labels_hash[0] = starttime.min.to_s
-      labels_hash[(numcols/2)-1] = (starttime + (timedelta/2)).min.to_s
-      labels_hash[numcols-1] = Time.now.min.to_s
-      interval_type = "Minute of the Hour"
+      labels_hash[0] = "Start"
+      labels_hash[(numcols/2)-1] = fmt_decimal((timedelta/120)) #halfway
+      labels_hash[numcols-1] = fmt_decimal((timedelta/60))
+      interval_type = "Minutes After Start"

     elsif timedelta < 2.days #more than 2 hours means use hours for labels
     elsif timedelta < 2.days #more than 2 hours means use hours for labels

-      labels_hash[0] = starttime.hour.to_s
-      labels_hash[(numcols/2)-1] = (starttime + (timedelta/2)).hour.to_s
-      labels_hash[numcols-1] = Time.now.hour.to_s
-      interval_type = "Hour of the Day on 24 hour scale"
+      labels_hash[0] = "Start"
+      labels_hash[(numcols/2)-1] = fmt_decimal((timedelta/7200))
+      labels_hash[numcols-1] = fmt_decimal((timedelta/3600))
+      interval_type = "Hours After Start (Up to 48)"

     else #more than 2 days means use dates for labels
       labels_hash[0] = (Date.parse(starttime.to_s)).to_s
     else #more than 2 days means use dates for labels
       labels_hash[0] = (Date.parse(starttime.to_s)).to_s

-      labels_hash[(numcols/2)-1] = (Date.parse(starttime + (timedelta/2))).to_s
+      labels_hash[(numcols/2)-1] = (Date.parse((starttime + (timedelta/2)).to_s)).to_s

       labels_hash[numcols-1] = (Date.today).to_s
       interval_type = "The Date"
     end
       labels_hash[numcols-1] = (Date.today).to_s
       interval_type = "The Date"
     end


@@ -184,15 +337,17 @@ class GraphController < ApplicationController
     return total_per_interval, labels_hash, interval_type   
   end
   
     return total_per_interval, labels_hash, interval_type   
   end
   

+  def fmt_decimal(number)
+    sprintf( "%0.1f", number)
+  end
+  

   def get_borda_points(result)
   def get_borda_points(result)

-    #points holds how mnay points each candidate has received in array form
-    #becasue Gruff::Bar#data takes only an array

     points = Array.new
     labels = Hash.new
 
     #Populate points with an sorted array from election.votes hash
     #biggest to smallest will go from left to right
     points = Array.new
     labels = Hash.new
 
     #Populate points with an sorted array from election.votes hash
     #biggest to smallest will go from left to right

-    points = result.election.votes.sort do |a, b|
+    points = result.points.sort do |a, b|

       b[1] <=> a[1]
     end.collect {|i| i[1]}
 
       b[1] <=> a[1]
     end.collect {|i| i[1]}
 


@@ -214,5 +369,4 @@ class GraphController < ApplicationController
     end
   return preference_tally
   end
     end
   return preference_tally
   end

-

 end
 end