Page 109 - DCAP504_Computer Graphics

Computer Graphics

Did you know? The ZUI interface paradigm is considered as a flexible and realistic successor to the
traditional windowing GUI. At present, effort is spent in developing GUIs rather than
developing ZUIs.

It is seen that the panning technique acts as a qualifier to the zooming transformation. Panning helps in
moving the scaled portion of the image to the center of the screen. The entire screen is filled on the basis
of the scale factor. By doing this, there is an increase in the zoom area in all the directions of the screen
even if the image portion is close to the screen limit.

7.5 Summary
• Computer graphics comprises all the animations and pictures which is not text or sound.
• Raster graphics consist of arrays of pixels.
• Vector graphics consists of paths.

• The region of the scene or an object bounded by a rectangular area is known as a window.
• The zone of the monitor screen within which a selected object is viewed is known as a viewport.
• The process of transforming a two-dimensional world coordinate to device coordinate is known as
window-to-viewport mapping.

• Tiling is described as the number of copies drawn of the same image in rows and columns across
the interface window so that they cover the entire window.
• The graphic pipeline is characterized as a series of stages which helps a user to create a digital
image of a model.
• The horizontal movement of a camera when a camera scans an object is called as panning.
• Zooming is a technique where the size of the object can be changed to view the object in detail.
7.6 Keywords

Clipping: It is the act of cutting the object to the desired shape and size.
Interpolation: The act of introducing or inserting between other elements or parts.
Zooming: To cause text or graphics in a window to appear larger on the screen.
ZUI: Zooming User Interface. A ZUI is a type of graphical user interface (GUI). A zooming user
interface (ZUI) is used to change the size of the object. The information appears on the virtual desktop
that is created using the vector graphics.

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