1. A method, comprising: displaying a background image on a display screen; receiving, from an input device, a signal indicative of a free hand line being drawn over the background image, wherein the signal includes coordinates of points of the free hand line with respect to the display screen and the free hand line is independent of content represented in the background image; storing the signal in a storage device; generating a smooth stiff line based on the store signal; and displaying the smooth stiff line over the background image.