Computer Aided Drafting And Design

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are drawn with the aid of a keyboard, mouse, or tracking ball. One selects the starting point of a line, the ending point, and the line is drawn. A scale at the bottom of the screen tells how long the line will be. On some CADD systems, the computer itself can measure how long the line will be while the operator inputs the length of the line. Lines are the basis of all drawings. Straight lines are fairly simple and quick to make, but what about curved or wavy lines? That's what different CADD commands are made for.

Different CADD commands make different things on the screen possible. There are commands for dimensioning, labeling, making circles, boxes, etc.

CADD comes in many forms. 3-D CADD uses lines in a 3 Dimensional form.
This is useful in drawing complex buildings and spheres.

CADD output comes in many forms also. Images may be produced by printer, which is less accurate, and by plotter, which draws all lines and curves by a small pen. This is the most ...

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