box-o-sand/map-mash/app/controllers/maps_controller.rb

class MapsController < ApplicationController
  def index
    @maps = Map.all

    respond_to do |format|
      format.html
      format.xml { render :xml => @maps }
    end
  end

  def show
    @map = Map.find(params[:id])

    respond_to do |format|
      format.png do
        GoogleMapLocationFetcher.new.fetch([@map.name]) do |loc,image|
          dest = Rails.root.join("public/maps/#{@map.id}.png")
          FileUtils.mkdir_p(File.dirname(dest))

          File.open(dest, 'w') do |f|
            f.write(image)
          end
          send_file(dest, :type => 'image/png')
        end
      end
    end
  end
end