2004

Table Of Contents
292 | Chapter 16 Draw Geometric Objects
To create a ray
1 From the Draw menu, choose Ray.
2 Specify a starting point for the ray.
3 Specify a point through which the ray should pass.
4 Continue to specify points to create additional rays as needed.
All subsequent rays pass through the first point specified.
5 Press
ENTER to end the command.
Command line
RAY
Create and Combine Areas (Regions)
Regions are two-dimensional enclosed areas you create from objects that
form closed loops. Loops can be combinations of lines, polylines, circles,
arcs, ellipses, elliptical arcs, and splines. The objects that make up the loops
must either be closed or form closed areas by sharing endpoints with other
objects.
Regions can be used for
Applying hatching and shading
Analyzing properties, such as area, using MASSPROP
Extracting design information, such as the centroid
You can create regions out of multiple loops and out of open curves whose
endpoints are connected and form loops. You cannot form regions from
open objects that intersect to form a closed area: for example, intersecting
arcs or self-intersecting curves.
You can also create regions using
BOUNDARY.
shapes that can form regions