1:- Window :- It is the place which is used for display. A display consists of a viewport. A window can be of any shape. It can be rectangular , circle , ellipse.
Generally , it defines what to be viewed on a particular screen.
2:- Viewport:– It is an area on display to which a window is mapped. Is basically defines where the image on the window is to be displayed.
A point P(X,Y) is displayed if it satifies the following condition.
where the ( wxmin wxmax wymin wymax ­) are the edges of the window.
If any of the four inequalities is not satisfied , the point are not displayed.
Assume that , we have a window in which we have to clip points.