require 'date'
class GraphController < ApplicationController
+
+ class GruffGraff
+
+ def initialize(options)
+ size = "700x400"
+ @graph = options[:graph_type].new(size)
+
+ @graph.theme = { :colors => ['#000000', '#00FFFF', '#FFCC00', '#990033'],
+ :background_colors => ['#74ce00', '#ffffff'] }
+ @graph.font = File.expand_path('/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf',
+ RAILS_ROOT)
+
+ # fill in the data with the optional data name
+ #Check to see if multiple datasets, if so, fill them all!
+ if options[:data].is_a?(Hash)
+ options[:data].each_pair do |name, array|
+ @graph.data( name, array)
+ 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] )
+ end
+
+ # 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
+ @graph.x_axis_label = options[:x_axis_label] \
+ if options.has_key?(:x_axis_label)
+ @graph.y_axis_label = options[:y_axis_label] \
+ if options.has_key?(:y_axis_label)
+ @graph.title = options[:title] if options.has_key?(:title)
+
+ @graph.minimum_value = 0.0
+
+ end
+
+ def output
+ return([@graph.to_blob, {:disposition => 'inline', :type => 'image/png'}])
+ end
+
+ end
+
# produce a graph of votes per day during an election
def votes_per_day
@election = Election.find(params[:id])
data, labels = get_votes_per_day_data(@election)
- line = Gruff::Line.new("700x400")
- line.theme = { :background_colors => ['#73BF26', '#ffffff'] }
- line.title = "Voters Per Day"
- line.font = File.expand_path('/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf',
- RAILS_ROOT)
-
- line.data("#{@election.name}", data )
- line.labels = labels
-
- line.x_axis_label = "Date"
- line.y_axis_label = "Number of Votes"
- line.minimum_value = 0.0
-
- line.draw
- send_data(line.to_blob, :disposition => 'inline', :type => 'image/png')
+ graph = GruffGraff.new( :graph_type => Gruff::Line,
+ :data_name => @election.name,
+ :data => data,
+ :interval_labels => labels,
+ :title => "Voters Per Day",
+ :x_axis_label => "Data",
+ :y_axis_label =>"Number of Votes")
+ send_data(*graph.output)
end
-
+
+ #will place votes in a fixed number of intervals, and shows votes over time
def votes_per_interval
@election = Election.find(params[:id])
- data, labels = get_votes_per_interval_data(@election)
-
- line = Gruff::Line.new("700x400")
- line.theme = { :background_colors => ['#73BF26', '#ffffff'] }
- line.title = "Voters Over Time"
- line.font = File.expand_path('/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf',
- RAILS_ROOT)
-
- line.data("#{@election.name}", data )
- line.labels = labels
-
- line.x_axis_label = "Intervals"
- line.y_axis_label = "Number of Votes"
- line.minimum_value = 0.0
-
- line.draw
- send_data(line.to_blob, :disposition => 'inline', :type => 'image/png')
+ data, labels, scale = get_votes_per_interval_data(@election)
+
+ graph = GruffGraff.new( :graph_type => Gruff::Line,
+ :data_name => @election.name,
+ :data => data,
+ :interval_labels => labels,
+ :title => "Voters Over Time",
+ :x_axis_label => scale,
+ :y_axis_label => "Number of Votes")
+ send_data(*graph.output)
end
-
+
+ def borda_bar
+ @election = Election.find(params[:id])
+ #pref_tally = make_preference_tally(@election)
+
+ #@borda_result = BordaVote.new(pref_tally).result
+ @election.results unless @election.borda_result
+ data, labels = get_borda_points(@election.borda_result)
+
+ graph = GruffGraff.new( :graph_type => Gruff::Bar,
+ :data_name => @election.name,
+ :data => data,
+ :interval_labels => labels,
+ :title => "Points Per Candidate",
+ :y_axis_label => "Points",
+ :x_axis_label => "Candidate")
+ 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])
+ pref_tally = make_preference_tally(@election)
+
+ fulldata, labels = get_positions_info(@election)
+ legend = Hash.new
+
+ @election.candidates.each_with_index do |candidate, index|
+ legend[candidate.name] = fulldata[index]
+ end
+
+ 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
+
private
+ def get_positions_info(election)
+ buckets = Hash.new
+ buckets2= Hash.new
+ rank_labels = Hash.new
+
+ election.candidates.each do |candidate|
+ buckets[candidate.id] = []
+ buckets2[candidate.id] = []
+ end
+
+ election.votes.each do |vote|
+ vote.rankings.each do |ranking|
+ buckets[ranking.candidate_id] << ranking.rank
+ end
+ end
+
+ buckets.each_pair do |id, array|
+ (1..election.candidates.size).each do |i|
+ buckets2[id] << (array.find_all {|rank| rank == i}).size
+ end
+ end
+
+ election.votes.each do |vote|
+ vote.rankings.size.times do |i|
+ rank_labels[i] = (i+1).to_s
+ end
+ end
+
+ return buckets2.values, rank_labels
+
+ end
+
# generate the data and labels for each graph
def get_votes_per_day_data(election)
voter_days = Array.new
# 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!
labels_hash = Hash.new
buckets = Hash.new
total_per_interval = Array.new
+ interval_type = ""
starttime = election.startdate
timedelta = Time.now - starttime
# 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
- # 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|
+ next unless vote.time
buckets.keys.sort.each do |inter|
if vote.time < inter
buckets[inter] << vote
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"
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"
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
# Make sure to return an array for data and hash for labels
- return total_per_interval, labels_hash
+ return total_per_interval, labels_hash, interval_type
+ end
+
+ def get_borda_points(result)
+ 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|
+ b[1] <=> a[1]
+ end.collect {|i| i[1]}
+
+ #make the labels
+ result.ranked_candidates.each_with_index do |candidate, index|
+ labels[index] = Candidate.find(candidate).name
+ end
+
+ return points, labels
+ end
+
+ #most vote result objects require an array of vote arrays, which this will make
+ def make_preference_tally(election)
+ preference_tally = Array.new
+ @election.voters.each do |voter|
+ next unless voter.voted?
+ preference_tally << voter.vote.rankings.sort.collect \
+ { |ranking| ranking.candidate.id }
+ end
+ return preference_tally
end
end
projects / selectricity-live / blobdiff