mouse stuff

//---

        public Rectangle CalculateRenderTargetPosition()
        {
            Rectangle rec = new Rectangle(0, 0, 0, 0);
            Single preferredAspect = Globals.RenderSize.Width / (Single)Globals.RenderSize.Height;
            Single outputAspect = Globals.WindowSize.Width / (Single)Globals.WindowSize.Height;
            if (outputAspect <= preferredAspect)
            {
                // output is taller than it is wider, bars on top/bottom
                Int32 presentHeight = (Int32)((Globals.WindowSize.Width / preferredAspect) + 0.5f);
                Int32 barHeight = (Globals.WindowSize.Height - presentHeight) / 2;
                rec = new Rectangle(0, barHeight, Globals.WindowSize.Width, presentHeight);
            }
            else
            {
                // output is wider than it is tall, bars left/right
                Int32 presentWidth = (Int32)((Globals.WindowSize.Height * preferredAspect) + 0.5f);
                Int32 barWidth = (Globals.WindowSize.Width - presentWidth) / 2;
                rec = new Rectangle(barWidth, 0, presentWidth, Globals.WindowSize.Height);
            }
            return rec;
        }

//---

        private void CalculateMousePosition()
        {
            //using same mouse code from http://www.david-gouveia.com/portfolio/2d-camera-with-parallax-scrolling-in-xna/
            Matrix cam = Globals.Camera.GetViewMatrix();
            MouseState ms = Mouse.GetState();
            Vector2 pos = new Vector2(0,0);

            if (Globals.WindowSize > Globals.RenderSize)
            {
                Rectangle r = Globals.Draw.CalculateRenderTargetPosition();
                Single aspect = Globals.WindowSize.Width / (Single)Globals.WindowSize.Height;

                pos = Vector2.Transform(new Vector2(
                        (ms.X - r.X) / aspect,
                        (ms.Y - r.Y) / aspect),
                    Matrix.Invert(cam));
            }
            else if (Globals.WindowSize == Globals.RenderSize)
            {
                pos = Vector2.Transform(new Vector2(ms.X, ms.Y, Matrix.Invert(cam));
            }
            this.MousePosition = pos;
        }