Function for negating a vector.

src/Math/Test/VectorTest.cpp

@@ -125,4 +125,11 @@ void VectorTest::angle() {
     QCOMPARE(Vector3::angle(a, b), 1.16251f);
 }
 
+void VectorTest::negative() {
+    float vec[] = { 1.0f, -3.0f, 5.0f, -10.0f };
+    float negative[] = { -1.0f, 3.0f, -5.0f, 10.0f };
+
+    QVERIFY(-Vector4(vec) == negative);
+}
+
 }}}

src/Math/Test/VectorTest.h

@@ -33,6 +33,7 @@ class VectorTest: public QObject {
         void length();
         void normalized();
         void angle();
+        void negative();
 };
 
 }}}

src/Math/Vector.h

@@ -148,6 +148,16 @@ template<class T, size_t size> class Vector {
             return out;
         }
 
+        /** @brief Negative vector */
+        Vector<T, size> operator-() const {
+            Vector<T, size> out;
+
+            for(size_t i = 0; i != size; ++i)
+                out.set(i, -at(i));
+
+            return out;
+        }
+
         /** @brief Vector length */
         T length() const {
             T out(0);