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

        public static Matrix CreateScale(float scale)
        {
            Matrix m = Matrix.Identity;
            m.M11 = m.M22 = m.M33 = scale;
            return m;
        }

        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);
        }