lib/dither/param.rb in dither-0.0.4 vs lib/dither/param.rb in dither-0.0.5

@@ -1,4 +1,19 @@
 
 module Dither
-  Param = Struct.new(:i, :j)
-end
+  Param = Struct.new(:i, :j) do
+    def <=>(param)
+      return 1 if param.unbound?
+
+      a = i <=> param.i
+      if a == 0
+        return j <=> param.j
+      else
+        return a
+      end
+    end
+
+    def unbound?
+      false
+    end
+  end # Param
+end # Dither