Color layering for Stories

story.rb

class Story < ActiveRecord::Base
  ...
  
  before_save :setColor

  ...

  private

  def setColor
    sc = {}
    total = 0
    if new_record? #for new records, add the associated thing to the totals
      Scoretype.all.each { |e| sc[e.id] = user.scoreFor(e) }
      total += user.totalScore.to_f 
      total += thing.scores.sum &:value
      thing.scores.each { |score| sc[score.scoretype.id] += score.value }
    else #get the totals for the selected story and older stories only
      Scoretype.all.each { |e| sc[e.id] = 0.0; }
      stories.each{ |story|
        thing = story.thing
        total += thing.scores.sum &:value
        thing.scores.each { |score| sc[score.scoretype.id] += score.value }
      }
    end

    scorearrays = sc.sort_by { |k,v| v } #most points goes first
    r = g = b = 255 #layering against flat white

    scorearrays.each { |scorearray|
      q,x,y,z,a = Scoretype.find(scorearray[0]).color.split(/\D+/) #q is useless; I'm lazy.
      x,y,z = [x,y,z].collect { |c| c.to_f } #MOAR FLOATS

      #opacity in each channel is the ratio of the category's points to the sum of points
      o = scorearray[1] / total

      #MATH
      r = ((x-r) * o + r).round
      g = ((y-g) * o + g).round
      b = ((z-b) * o + b).round
    }

    self.color = "rgb(#{r},#{g},#{b})" #Neat, yeah?
  end

  ...

end