2004

266 | Chapter 16 Draw Geometric Objects
3 Under Boundary Set, do one of the following:
■ To create a boundary set from all objects visible in the current viewport,
select Current Viewport. Avoid this option for large, complex drawings.
■ To specify which objects to include in the boundary set, choose New.
Select the objects AutoCAD should examine in order to create the
boundary. Choosing this option automatically selects the Existing Set
option.
4 Under Island Detection method, specify whether boundaries include
"islands" (Flood option) or exclude islands (Ray Casting option).
5 Choose Pick Points.
6 Specify points within each area that you want to form a boundary
polyline.
This area must be totally enclosed; that is, there can be no gaps between
enclosing objects. You can select more than one area.
7 Press
ENTER to create the boundary polyline and end the command.
AutoCAD creates a polyline in the shape of the boundary. Because this
polyline overlaps the objects used to create it, it may not be visible. How-
ever, you can move, copy, or modify it just as you can any other polyline.
Command line
BOUNDARY
Draw Polygons
Polygons are closed polylines with between 3 and 1,024 equal-length sides.
Creating polygons is a simple way to draw squares, equilateral triangles,
octagons, and so on.
The following illustrations show polygons drawn using the three methods.
In the first two illustrations, point 1 is the center of the polygon and point 2
defines the radius length, which is being specified with the pointing device.
edge
endpoint
edge start
point
2
1
2
inscribed circumscribed edge
1