The picture above shows a typical object producing graphics output in its window: on a gray background a white rectangle with a black shadow represents the current drawing area. Under normal operation this is the paper in the Windows default printer and what you see on the screen is what you will get on the printer.
If you resize the window a re-scaling of the drawing area is done such that you get the largest possible size without changing the proportions of the drawing area, i.e. you can have something like
or like
and you will always see an undistorted graph on the 'white paper'.