AutoCAD 2002 Bible

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Drawing Curves and Point Objects


AutoCAD offers a number of ways to create curved objects. You can draw circles, arcs, ellipses, and donuts (also called doughnuts). In this chapter, I also cover point objects that are neither curves nor lines, but that don’t deserve their own chapter.


Cross-    Several complex objects involve curves, such as polylines.


Reference^ splines, regions, and boundaries. These are covered in Chapter 16.

Drawing Circles


Circles are common objects in drawings. In mechanical drawings, they often represent holes or wheels. In architectural drawings, they may be used for doorknobs, trash baskets, or trees. In electrical and piping schematics, they are used for various kinds of symbols.

Understanding the circle options


AutoCAD provides five ways to draw a circle. To draw a circle, choose Circle from the Draw toolbar. AutoCAD responds with the Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: prompt. Table 7-1 describes how to use these options.




Table 7-1


Five Ways to Draw a Circle


Option


Description


Center


Radius


This is the default. Specify the center and then the radius. You can type the radius as a distance or pick a point on the circumference.


Center


Diameter


Specify the center. Type d J and type the length of the diameter or pick a point to specify the diameter.

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