Microsoft.Xna.Framework.Matrix.CreateScale C# (CSharp) Method

        public static Matrix CreateScale(float xScale, float yScale, float zScale)
        {
            Matrix result;
            result.M11 = xScale;
            result.M12 = 0f;
            result.M13 = 0f;
            result.M14 = 0f;
            result.M21 = 0f;
            result.M22 = yScale;
            result.M23 = 0f;
            result.M24 = 0f;
            result.M31 = 0f;
            result.M32 = 0f;
            result.M33 = zScale;
            result.M34 = 0f;
            result.M41 = 0f;
            result.M42 = 0f;
            result.M43 = 0f;
            result.M44 = 1f;
            return result;
        }

        public Matrix GetScaleMatrix()
        {
            if (scaleMatrix.HasValue == false)
            {
                var screenSize = Client.ScreenManager.CurrentScreen.GetLayoutSize();

                var gameWorldSize = new Vector2(screenSize.Width, screenSize.Height);
                var vp            = graphicsDevice.Viewport;

                var scaleX = vp.Width / gameWorldSize.X;
                var scaleY = vp.Height / gameWorldSize.Y;
                scaleY = scaleX;

                var translateX = (vp.Width - (gameWorldSize.X * scaleX)) / 2f;
                var translateY = (vp.Height - (gameWorldSize.Y * scaleY)) / 2f;


                var camera = Matrix.CreateScale(scaleX, scaleY, 1)
                             * Matrix.CreateTranslation(translateX, translateY, 0);

                scaleMatrix = camera;
            }

            return(scaleMatrix.Value);
        }