Implemented Quaternion scaling by scalars. Fixes issue [#1131]: "[Math] add Quaternion scaling (easy)".

Source/OpenTK/Math/Quaternion.cs

@@ -316,6 +316,28 @@ namespace OpenTK
                 left.W * right.W - Vector3.Dot(left.Xyz, right.Xyz));
         }
 
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <param name="result">A new instance containing the result of the calculation.</param>
+        public static void Multiply(ref Quaternion quaternion, ref float scale, out Quaternion result)
+        {
+            result = new Quaternion(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaternion Multiply(Quaternion quaternion, float scale)
+        {
+            return new Quaternion(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
         #endregion
 
         #region Conjugate
@@ -540,6 +562,28 @@ namespace OpenTK
             return left;
         }
 
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaternion operator *(Quaternion quaternion, float scale)
+        {
+            return new Quaternion(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaternion operator *(float scale, Quaternion quaternion)
+        {
+            return new Quaternion(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
         /// <summary>
         /// Compares two instances for equality.
         /// </summary>

Source/OpenTK/Math/Quaterniond.cs

@@ -316,6 +316,28 @@ namespace OpenTK
                 left.W * right.W - Vector3d.Dot(left.Xyz, right.Xyz));
         }
 
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <param name="result">A new instance containing the result of the calculation.</param>
+        public static void Multiply(ref Quaterniond quaternion, ref double scale, out Quaterniond result)
+        {
+            result = new Quaterniond(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaterniond Multiply(Quaterniond quaternion, double scale)
+        {
+            return new Quaterniond(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
         #endregion
 
         #region Conjugate
@@ -540,6 +562,28 @@ namespace OpenTK
             return left;
         }
 
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaterniond operator *(Quaterniond quaternion, double scale)
+        {
+            return new Quaterniond(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
+        /// <summary>
+        /// Multiplies an instance by a scalar.
+        /// </summary>
+        /// <param name="quaternion">The instance.</param>
+        /// <param name="scale">The scalar.</param>
+        /// <returns>A new instance containing the result of the calculation.</returns>
+        public static Quaterniond operator *(double scale, Quaterniond quaternion)
+        {
+            return new Quaterniond(quaternion.X * scale, quaternion.Y * scale, quaternion.Z * scale, quaternion.W * scale);
+        }
+
         /// <summary>
         /// Compares two instances for equality.
         /// </summary>