lib/jpeg/image.rb in jpeg-0.7.0 vs lib/jpeg/image.rb in jpeg-0.7.1

@@ -1,11 +1,24 @@
 module Jpeg
   class Image
+    def at(x, y)
+      raise 'invalid position' unless inside? x, y
+      dot = raw_data[y][x]
+      color? ? Color.new(*dot) : Color.new(dot, dot, dot)
+    end
+
     def rgb?
       color_info == :rgb
     end
+    alias color? rgb?
 
     def gray?
       color_info == :gray
+    end
+
+    private
+
+    def inside?(x, y)
+      x < width && x >= 0 && y < height && y >= 0
     end
   end
 end