lib/polynomials/point.rb in polynomials-0.4.3 vs lib/polynomials/point.rb in polynomials-0.4.4

@@ -2,17 +2,18 @@
   class Point
     include Comparable
     attr_accessor :x, :y
     alias to_f x
 
-    def self.inherited(subclass)
-      self.class_eval do 
-        define_method :"#{subclass.name.demodulize.underscore}?" do
-          self.is_a? subclass
+    %w{Extremum Root InflectionPoint}.each do |special_point|
+      self.class_eval do
+        define_method :"#{special_point.underscore}?" do
+          self.is_a? Polynomials.const_get(special_point)
         end
       end
     end
+
     def initialize(x,y)
       @x,@y = x,y
     end
 
     def to_s
@@ -66,7 +67,15 @@
       super(x,0)
     end
   end
 
   class InflectionPoint < Point
+  end
+
+  [:maximum,:minimum].each do |kind_of_extremum|
+    const_set(kind_of_extremum.to_s.capitalize, Class.new(Extremum) do
+      def initialize(x,y)
+        super x,y,kind_of_extremum
+      end
+    end)
   end
 end