ABSTRACT
Two technologies are used in creating and displaying images on the graphics screen, they are called vector and raster graphics. As the name implies, vector images are described mathematically. In vector graphics a straight line is defined by the screen location of its start and end points, while circles and ellipses are defined by the dimension and coordinates of the rectangle that tightly contains the figure. In other words, in vector graphics a complex graphical object consists of the descriptions of all the simpler component that form it. Since vector-defined objects are a numerical expression, the objects can be manipulated by transforming the values that represent it. Thus, vector images can be moved, scaled, and rotated on the screen by performing mathematical operations on its data.
