Websnap example on heroku

gistfile1.rb

#The code in the rake task looks like this: 
#lib/tasks/scheduler.rake
desc "Updates the images for winter conditions"
task :update_images => :environment do
  puts "Updating Images"
  WinterCondition.update_images
  puts "Done Updating Images"
end

#app/models/WinterCondition.rb
def self.update_images
  url  = "http://lb.511ia.org/ialb/winterdriving/routeselect.jsf?view=desmoines"
  snap = WebSnap::Snapper.new(url, :format => 'png',
                                   :'scale-h' => nil,
                                   :'scale-w' => nil,
                                   :'crop-h' => 380,
                                   :'crop-w' => 640,
                                   :quality => 100,
                                   :'crop-x' => 260,
                                   :'crop-y' => 265)

  wc = WinterCondition.find(1)
  wc.image = snap.to_bytes
  wc.save!
end

#app/controllers/winter_conditions_controller.rb
def image
  @wc = WinterCondition.find(1)
  respond_to do |format|
    format.png {
      send_data @wc.image, :filename => "#{Rails.root}/png/desmoines.png", :type => "image/png", :disposition => 'inline'
    }
  end
end