Merge pull request #10 from jayjlawrence/master

Handle case where line has identical start and end points

lib/segment.rb

@@ -71,6 +71,8 @@ def distance_to(point)
       p1 = point1.to_vector
       p2 = point2.to_vector
 
+      return Geometry.distance(q, p1) if p1 == p2
+
       u = p2 - p1
       v = q - p1
 

test/segment/distance_to_test.rb

@@ -28,4 +28,10 @@ def test_distance_to_segment_end
     assert_equal 1, segment.distance_to(point)
   end
 
-end
+  def test_distance_to_point_segment
+    segment = Segment.new_by_arrays([0, 1], [0, 1])
+    point = Point.new(1, 1)
+    assert_equal 1, segment.distance_to(point)
+  end
+
+end