Objects and Models

Abstract

A graphics display is a drawing area comprised of an array of fine points called pixels. At the heart of a graphics system there is a magic pen, which can move at lightning speed to a specific pixel and draw the pixel with a specific color — a red, green, and blue (RGB) vector value. This pen can be controlled directly by hand through an input device (mouse or keyboard) like a simple paintbrush. In this case, we can draw whatever we imagine, but it takes a real artist to come up with a good painting. Computer graphics, however, is about using this pen automatically through programming.