libdeng2|Vector: Squared length for 2-component vectors

skyjake · Apr 7, 2014 · 82ea2f6 · 82ea2f6
1 parent dd398d5
commit 82ea2f6
Showing 1 changed file with 8 additions and 2 deletions.
diff --git a/doomsday/libdeng2/include/de/core/vector.h b/doomsday/libdeng2/include/de/core/vector.h
@@ -166,8 +166,11 @@ class Vector2
     bool operator <= (Vector2 const &other) const {
         return *this == other || *this < other;
     }
-    ddouble length() const {
-        return std::sqrt(ddouble(x*x + y*y));
+    inline ddouble length() const {
+        return std::sqrt(lengthSquared());
+    }
+    inline ddouble lengthSquared() const {
+        return ddouble(x*x + y*y);
     }
     void setLength(ddouble len) {
         *this = *this / length() * len;
@@ -701,6 +704,9 @@ typedef Vector4<dfloat>  Vector4f;  ///< 4-component vector of floating point va
 typedef Vector4<ddouble> Vector4d;  ///< 4-component vector of high-precision floating point values.
 ///@}
 
+// Qt hash functions:
+inline quint32 qHash(Vector2i const &vec) { return vec.x * vec.y + vec.x - vec.y; }
+
 } // namespace de
 
 #endif /* LIBDENG2_VECTOR_H */