Multiple Windowing in Computer Graphics

Pre-requisites: Line Clipping

Clipping is the process of removing undesired parts of an image and displaying only a certain portion of the image. Clipping is used to remove lines or objects that are not inside the viewing pane. The portion that is being removed or clipped is called the clipped part. 

In computer graphics, clipping can be applied to various graphics primitives such as lines, polygons, points, and curves. 

Clipping

Now let’s understand what is Windowing. Before that, we must know the concept of Windows and Viewports.

A world-coordinate system selected for display is called a Window and the area on the device coordinate to which a Window is mapped is called a Viewport.

The mapping of a part of the World-coordinate system to a device coordinate is called viewing transformation or Window-to-viewport transformation or simply, windowing transformation. 

 

Some systems allow the use of multiple windowing, that is the first image is created by one or more window transformations on the object. Then windows are applied to this first image to create a second image. Further windowing transformations may be done until the desired picture is created. 

Every application of window transformation allows the user to select a portion of the picture and reposition it on the screen. Thus, multiple windowing gives the user freedom to rearrange components of the picture.