Adding in a png method

lib/squib/api/image.rb

@@ -2,7 +2,9 @@ module Squib
   class Deck
     
     def png(range=:all, file: nil, x: 0, y: 0)
-      raise 'Not implemented!'
+      range = rangeify(range)
+      file = fileify(file)
+      range.each{ |i| @cards[i].png(file, x, y) }
     end
 
   end

lib/squib/card.rb

@@ -16,6 +16,7 @@ module Squib
     ### BACKEND GRAPHICS ###
     ########################
     require 'squib/graphics/background'
+    require 'squib/graphics/image'
     require 'squib/graphics/save_doc'
     require 'squib/graphics/save_images'
     require 'squib/graphics/shapes'

lib/squib/deck.rb

@@ -30,6 +30,11 @@ module Squib
       return range
     end
 
+    def fileify(file)
+      raise 'File #{file} does not exist!' unless File.exists? file
+      file
+    end
+
     ##################
     ### PUBLIC API ###
     ##################

lib/squib/graphics/image.rb

@@ -0,0 +1,12 @@
+module Squib
+  class Card
+
+    def png(file, x, y)
+      cc = cairo_context
+      png = Cairo::ImageSurface.from_png(file)
+      cc.set_source(png, x, y)
+      cc.paint
+    end
+
+  end
+end