Computer graphics started with the display of data on hardcopy plotters and Cathode Ray Tube (CRT) screens soon after the introduction of computers themselves. It has grown to include the creation, storage, and manipulation of models and images of objects. These models come from a diverse and expanding set of fields and include physical, mathematical, engineering, architectural, and even conceptual (abstract) structures, natural phenomena and so on. Computer graphics today is largely interactive: The user controls the contents, structures, and appearance of objects and of their displayed images by using input devices such as keyboard, mouse, and touch-sensitive panel on screen.
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