+require 'date'
class GraphController < ApplicationController
-
# 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
+
+ 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)
send_data(line.to_blob, :disposition => 'inline', :type => 'image/png')
end
+ 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')
+ end
+
+ private
+
# generate the data and labels for each graph
def get_votes_per_day_data(election)
-
- voter_times = Array.new
+ voter_days = Array.new
unique_days = Array.new
- voters_per_day = Array.new
- days_hash = Hash.new
+ total_per_day = Array.new
+ election_days = Hash.new
+ #turn election startdate into date object, and create the range of election
+ startdate = Date.parse(election.startdate.to_s)
+ election_range = startdate..Date.today
+
+ # create a hash with all the dates of the election in String format
+ # referenced by their order in the election
+ election_range.each_with_index do |day, index|
+ election_days[index] = day.to_s
+ end
+
+ # Now I need to create an array with all the times votes were made
election.votes.each do |vote|
- unless voter_times.any? {|utime| utime == vote.time}
- voter_times << vote.time
- end
+ voter_days << Date.parse(vote.time.to_s)
end
+ voter_days.sort!
- voter_times.sort!
-
- voter_times.each_with_index do |time, index|
- count = 1
- # TODO: add comment
- unless unique_days.any? { |d1| d1.eql?(time.mon.to_s + "/" + time.day.to_s) }
- unique_days << (time.mon.to_s + "/" + time.day.to_s)
- count += (voter_times[(index+1)..-1].find_all \
- {|t| t.mon == time.mon && t.day == time.day}).size
- voters_per_day << count
- end
+ # Now I need to count how many times each each date appears in voter_days,
+ # and put that number into a votes_per_day array, the 'data' for the graph
+ #Create an array of unique days from voter_days
+ voter_days.each do |day|
+ unless unique_days.any? {|date| date.eql?(day)}
+ unique_days << day
+ end
end
+ unique_days.sort!
- unique_days.each_with_index do |fmtdate, index|
- days_hash[index] = fmtdate
+ #find all dates where those days = date at current index, put size of returned
+ #array into total_per_day
+ unique_days.each_with_index do |date, index|
+ total_per_day << (voter_days.select {|day| day.eql?(date)}).size
end
# return the data and the labels
- return voters_per_day, days_hash
+ return total_per_day, election_days
end
+
+ def get_votes_per_interval_data(election)
+ labels_hash = Hash.new
+ buckets = Hash.new
+ total_per_interval = Array.new
+
+ starttime = election.startdate
+ timedelta = Time.now - starttime
+ numcols = 10
+ interval_length = timedelta/numcols
+
+ # 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
+ 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
+ # vote objects
+ election.votes.each do |vote|
+ buckets.keys.sort.each do |inter|
+ if vote.time < inter
+ buckets[inter] << vote
+ end
+ end
+ end
+
+ total_per_interval = buckets.keys.sort.collect {|key| buckets[key].size}
+
+ # 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
+ 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
+ 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-1] = (Date.today).to_s
+ end
+
+ # Make sure to return an array for data and hash for labels
+ return total_per_interval, labels_hash
+ end
end
projects / selectricity / commitdiff