Book Description

The computer is an information-processing machine. It is a tool for storing, manipulating and correlating data. There are many ways to communicate the processed information to the user. The computer graphics is one of the most effective and commonly used way to communicate the processed information to the user. It displays the information in the form of graphics objects such as pictures, charts, graphs and diagrams instead of simple text. Thus we can say that computer graphics makes it possible to express data in pictorial form. The picture or graphics object may be an engineering drawing, business graphs, architectural structures, a single frame from an animated movie or a machine parts illustrated for a service manual. Giving the computer the ability to express its data in pictorial form can greatly increase its ability to provide information to the user. This is the passive form of graphics. The passive graphics devices such printers, plotters, recorders, storage tubes and raster CRT displays draws the pictures under computer control to communicate graphically with the user. However, it is more convenient and appropriate to input graphical information directly to the computer. This can be achieved by graphical input devices. The combination of graphical input and output devices allows the input from the user alter the output presented by the computer; a dialogue can be established through the graphics medium. This is termed interactive computer graphics. It allows the user to interact with the computer using the graphics media.