Two-Dimensional Viewing or window-to-viewport transformation or windowing transformation

Transformations from world to device coordinates involve:

--Translation

--Rotation

--scaling operations

--Deleting unwanted parts of the picture

THE VIEWING PIPELINE

Window- world-coordinate area selected for display (Where)

Viewport- Area where the window is mapped (what)

viewing transformation - mapping of a part of a world-coordinate scene to device coordinates

Zoom-in - to view details that are not shown with larger windows

Zoom out – overview

Panning effects - moving a fixed-size window across the various objects