[Issue #71] Update vector2 fuctions from vector3 (#130)

Signed-off-by: pxalcantara <[email protected]>

include/ignition/math/Vector2.hh

@@ -65,6 +65,13 @@ namespace ignition
       /// \brief Destructor
       public: virtual ~Vector2() {}
 
+      /// \brief Return the sum of the values
+      /// \return the sum
+      public: T Sum() const
+      {
+        return this->data[0] + this->data[1];
+      }
+
       /// \brief Calc distance to the given point
       /// \param[in] _pt The point to measure to
       /// \return the distance
@@ -101,6 +108,15 @@ namespace ignition
         }
       }
 
+      /// \brief Returns a normalized vector
+      /// \return unit length vector
+      public: Vector2 Normalized() const
+      {
+        Vector2<T> result = *this;
+        result.Normalize();
+        return result;
+      }
+
       /// \brief Set the contents of the vector
       /// \param[in] _x value along x
       /// \param[in] _y value along y

src/Vector2_TEST.cc

@@ -124,6 +124,38 @@ TEST(Vector2Test, Vector2)
   EXPECT_DOUBLE_EQ(7, v[1]);
 }
 
+/////////////////////////////////////////////////
+TEST(Vector2Test, TestSum)
+{
+  math::Vector2 vec1(0, 0);
+  math::Vector2 vec2(1.0, 2.5);
+  math::Vector2 vec3(-2, -4);
+
+  int sum1 = vec1.Sum();
+  float sum2 = vec2.Sum();
+  int sum3 = vec3.Sum();
+
+  EXPECT_EQ(sum1, 0);
+  EXPECT_FLOAT_EQ(sum2, 3.5);
+  EXPECT_EQ(sum3, -6);
+}
+
+/////////////////////////////////////////////////
+TEST(Vector2Test, TestNormalized)
+{
+  math::Vector2d vec1(0, 0);
+  math::Vector2d vec2(1, 2);
+
+  math::Vector2d vec3 = vec1.Normalized();
+
+  // O zero vector should be equal to the normalized vector
+  EXPECT_EQ(vec1, vec3);
+  EXPECT_NE(vec2, vec3);
+
+  vec3 = vec2.Normalized();
+  EXPECT_EQ(vec3, math::Vector2d(0.447213, 0.894427));
+}
+
 /////////////////////////////////////////////////
 TEST(Vector2Test, NoException)
 {