public static void MouseCameraControl(Camera camera)
        {
            Cursor cursor = GuiManager.Cursor;
            if (cursor.WindowOver == null && GuiManager.DominantWindowActive == false)
            {
                float pixelSize = 1/camera.PixelsPerUnitAt(0);


                // middle-click drag moves the camera
                if (InputManager.Mouse.ButtonDown(FlatRedBall.Input.Mouse.MouseButtons.MiddleButton))
                {
                    camera.X += -InputManager.Mouse.XChange * pixelSize;
                    camera.Y += InputManager.Mouse.YChange * pixelSize;
                }

                // double-click the middle-mouse button to center on the mouse's position
                if (InputManager.Mouse.ButtonDoubleClicked(FlatRedBall.Input.Mouse.MouseButtons.MiddleButton))
                {
                    cursor.GetCursorPosition(camera, 0);
                }

                // mouse-wheel scrolling zooms in and out
                if (InputManager.Mouse.ScrollWheel != 0 && GuiManager.DominantWindowActive == false)
                {
                    if (camera.Orthogonal == false)
                        camera.Z *= 1 + System.Math.Sign(InputManager.Mouse.ScrollWheel) * -.1f;
                    else
                    {
                        camera.OrthogonalHeight *= 1 + System.Math.Sign(InputManager.Mouse.ScrollWheel) * -.1f;
                        camera.OrthogonalWidth *= 1 + System.Math.Sign(InputManager.Mouse.ScrollWheel) * -.1f;
                    }
                }
            }

        }