class SparklinesController < ApplicationController

  # Handles requests for sparkline graphs from views.
  #
  # Params are generated by the sparkline_tag helper method.
  #
	def index
		# Make array from comma-delimited list of data values
		ary = []
		if params.has_key?('results') && !params['results'].nil?
		  params['results'].split(',').each do |s|
			  ary << s.to_i
		  end
		end
		
		send_data( Sparklines.plot( ary, params ), 
					:disposition => 'inline',
					:type => 'image/png',
					:filename => "spark_#{params[:type]}.png" )
	end


  # Use this type of method for sparklines that can be cached. (Doesn't work with the helper.)
  #
  # To make caching easier, add a line like this to config/routes.rb:
  # map.sparklines "sparklines/:action/:id/image.png", :controller => "sparklines"
  #
  # Then reference it with the named route:
  #   image_tag sparklines_url(:action => 'show', :id => 42)
  def show
    send_data(Sparklines.plot(
                [42, 37, 89, 74, 70, 50, 40, 30, 40, 50],
                :type => 'bar', :above_color => 'orange'
              ), 
              :disposition => 'inline', 
              :type => 'image/png', 
              :filename => "sparkline.png")
  end

end