lib/geomotion/cg_point.rb in geomotion-0.1 vs lib/geomotion/cg_point.rb in geomotion-0.5

@@ -4,11 +4,11 @@
     CGPoint.new(options[:x] || 0, options[:y] || 0)
   end
 
   # size = CGSize.make width: 100, height: 100
   # point = CPPoint.make x:0, y:10
-  # point.rect_of_size(point)  # => CGRect([0, 10], [100, 100])
+  # point.rect_of_size(size)  # => CGRect([0, 10], [100, 100])
   # point.rect_of_size([10, 20])  # => CGRect([10, 20], [100, 100])
   def rect_of_size(size)
     CGRect.new([self.x, self.y], size)
   end
 
@@ -29,8 +29,20 @@
     CGRectContainsPoint(rect, self)
   end
 
   def ==(point)
     point.is_a?(CGPoint) && CGPointEqualToPoint(self, point)
+  end
+
+  def -@
+    CGPoint.new(-self.x, -self.y)
+  end
+
+  def -(other)
+    self.+(-other)
+  end
+
+  def inspect
+    "#{self.class.name}(#{self.x}, #{self.y})"
   end
 
 end